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Perspectives of pteridophytes microbiome for bioremediation in agricultural applications

  • Yasaswinee Rout , Soumya Sephalika Swain , Madhusmita Ghana , Debabrata Dash and Shubhransu Nayak EMAIL logo
Published/Copyright: May 31, 2024

Abstract

The microbiome is the synchronised congregation of millions of microbial cells in a particular ecosystem. The rhizospheric, phyllospheric, and endospheric microbial diversity of lower groups of plants like pteridophytes, which includes the Ferns and Fern Allies, have also given numerous alternative opportunities to achieve greener and sustainable agriculture. The broad-spectrum bioactivities of these microorganisms, including bioremediation of heavy metals (HMs) in contaminated soil, have been drawing the attention of agricultural researchers for the preparation of bioformulations for applications in climate-resilient and versatile agricultural production systems. Pteridophytes have an enormous capacity to absorb HMs from the soil. However, their direct application in the agricultural field for HM absorption seems infeasible. At the same time, utilisation of Pteridophyte-associated microbes having the capacity for bioremediation have been evaluated and can revolutionise agriculture in mining and mineral-rich areas. In spite of the great potential, this group of microbiomes has been less studied. Under these facts, this prospective review was carried out to summarise the basic and applied research on the potential of Pteridophyte microbiomes for soil bioremediation and other agricultural applications globally. Gaps have also been indicated to present scopes for future research programmes.

1 Introduction

Industrialisation, agricultural intensification, waste disposal, and its associated activities have directed the production and release of several chemical compounds such as organic solvents, chemical fertilisers, pesticides, pigments, dyes, and plastics to the surroundings, which has contributed to the gross degradation of the environment. Aside from all of these environmental contaminants, heavy metals (HMs) are considered to be one of the most significant noxious elements that are harmful to agricultural crops and humans subsequently. In addition to these factors, diesel is one of the most frequently reported causes of soil and water contamination due to extensive transportation and application in automobiles and industrial sectors. Parallel to this, scientists are developing greener farming practices in order to replace synthetic chemicals in use and enhance soil health through bioremediation. These alternatives usually come from plants, animals, and microbial resources. Plants and soil harbour millions of microorganisms, which collectively form a microbial community known as the “microbiome” that imparts a number of beneficial effects on the plants and ecosystem [1,2]. Microbial strains from various sources or microbiomes have been utilised in agricultural operations as an option for eco-friendly and sustainable agriculture production systems. The application of an efficient and diverse soil microbiome backed by modern technologies can facilitate and promote sustainable agriculture and can effectively contribute to meeting the triple requirements of economic, social, and environmental sustainability. Soil, plants, and special habitats like hot springs, forests, and contaminated areas have been primarily used as sources of these beneficial microbes and microbiomes.

However, microbiomes associated with lower plants like “Pteridophytes,” which include Ferns and Fern allies, have also attracted the attention of the scientific communities as sources of novel bioactive secondary metabolites [3]. Ferns are one of the most significant plant groups because of their greater diversity, especially in tropical areas. Beneficial microbes are abundantly associated in the rhizosphere, phyllosphere, and endosphere of various species of ferns. Ferns are known to possess the capacity for removing contaminants via accumulation, chelation, and detoxification mechanisms, and this property helps them to survive in stressed ecosystems like mineral-rich soils [4,5,6]. The fibrous root system supports pollutant degradation by providing favourable environmental conditions for microbial activities and pollutant metabolism [7]. Various studies have proved that microbes associated with ferns absorb HMs through their cells and also enhance the bioaccumulation of minerals in plant biomass, which makes them ideal candidates for soil bioremediation [8,9,10].

In spite of this great potential, fern-associated microbes have been less studied regarding their practical applicability for bioremediation of agricultural soil. To date, no formulation has been developed globally with microbial strains isolated from ferns. Usually, culturable microorganisms could be used more feasibly for practical applications than their genome in the environment. Hence, more exploration of microbial diversity is required in various species of ferns from different habitats to generate more insights into the fern–microbe interactions. Under these facts, the current review was carried out to discuss the enormous potential of various microbial groups associated with Pteridophyte (ferns and fern allies) regarding soil bioremediation and to put light on research gaps of utilisation in agriculture.

2 Methodology for data collection and systematic literature review

Global literature on the microbial significance of pteridophytes was collected from scientific journals (local, regional, and global), books, book chapters, magazines, conference/seminar proceedings, unpublished/published M.Sc. and Ph.D. dissertations, and other online databases, including Research gate, PubMed, Science Direct, DOAJ, Google Scholar, and Web of Science. To ensure a comprehensive and thorough study, a systematic review methodology has been used. This included collection, evaluation, and synthesis of evidence from a variety of sources [11,12]. This approach included searching databases, screening titles and abstracts, and then critically appraising the studies in order to assess their validity and reliability. Systematic reviews provide a comprehensive analysis of published and unpublished evidence on a given research topic by which it is easy to identify, assess, and synthesise the findings of all relevant studies [13]. While this study focuses on the importance of microorganisms associated with pteridophytes from the perspective of agriculture and HM tolerance capacities among other plants worldwide, the acquired results from search engines are correlated with the review’s objectives. The steps of a systematic review are presented in Figure 1.

Figure 1 
               Structural outline of the article selection process for a systematic article review.
Figure 1

Structural outline of the article selection process for a systematic article review.

3 Results and discussion

3.1 Ecological significance of pteridophytes: the “Plant Amphibians”

Pteridophytes or Vascular cryptogams or ferns and fern allies are also termed as “Amphibians” of the Plant Kingdom since they need water for fertilisation. They consist of non-flowering and primitive vascular plants that occur in humid and cooler localities [14]. These are an ancient group of plants which, according to the Five Kingdoms classification, include the Filicinophyta (ferns), Sphenophyta (horsetails), Lycophyta (lycopods), and Psilophyta (whisk ferns). They are represented by between 12,000 and 15,000 species and are most widely distributed in the tropics [15,16]. About 13,600 species belonging to 305 genera are found worldwide [17], out of which 1,200 species belonging to 70 families and 191 genera are found in India [18,19,20]. Pteridophytes can grow on trees (epiphytes), on crevices of rocks (lithophytes), and even found completely immersed in water (hydrophytes) [21].

About 170 species of pteridophytes have been reported to play important roles in food, medicine, biogas, phytoremediation, biofertiliser, bio-indicator for pollution, etc. (Figure 2) [22]. Pteridophytes are not just randomly distributed in a locality, as the condition of their microhabitats is determined by soil texture, soil fertility, atmospheric conditions, precipitation, and light intensity [20,23]. They are considered excellent ecological indicators (EI) of various environmental factors such as soil type, environmental integrity, climate change, environmental pollution, association with other groups of organisms, etc. Ferns belonging to subclasses Polypodiidae, Equisetidae, Ophioglossidae, and Marattiidae of the family Polypodiopsida are cited as EIs. Asplenium sp., Blechnum sp., Cyathea sp., Pteridium sp., Equisetum sp., Dicranopteris sp., Polypodium sp., Adiantum sp., and Pteris sp. are some commonly cited EIs [24].

Figure 2 
                  Environmentally important pteridophytes play a vital role in the ecosystem.
Figure 2

Environmentally important pteridophytes play a vital role in the ecosystem.

3.2 Microbial diversity associated with pteridophytes

Like any other terrestrial and aquatic plants, Pteridophytes are also found to be closely associated with a wide diversity of microorganisms, especially bacteria, fungi, actinomycetes, etc. (Figure 3). Numerous studies have been conducted by various researchers around the globe to explore and enumerate the pteridophyte-associated microbial diversity. They play vital roles in the health of both the host plant and the ecosystem, such as nutrient supply, resistance against biotic and abiotic stresses, production of growth hormones and secondary metabolites, etc. [25]. However, less research has been conducted regarding the applicability of those microorganisms and those to only specific subject areas. These microorganisms could exhibit a number of beneficial attributes not only to the host plant but also could be used independently as per their application potential. In particular, the fern-associated microbes showed greater bioactivity for potential use in agriculture. Mostly, bacterial species that have been isolated from many common ferns of specific habitats exhibited plant growth-promoting activities, inhibited plant pathogens, and imparted tolerance to salinity. Furthermore, these groups of bacteria also showed a higher potential to absorb and neutralise many HMs. However, there are still many species of ferns that remain to be explored, and activities like bioremediation need to be studied more extensively for the utilisation of these groups of microbes for application in agriculture in affected areas. Hence, it is very much essential to consolidate the relevant studies to date to enumerate the significance of fern-associated microbiomes regarding their potential to absorb HMs in biological soil remediation.

Figure 3 
                  Predominant Pteridophyte species having microbial association with higher bioactivities for potential applications in agriculture: (a) Pteris vittata, (b) Azolla sp., (c) Huperzia sp., (d) Adiantum sp., (e) Tectaria sp., (f) Dryopteris sp., and (g) Lygodium sp.
Figure 3

Predominant Pteridophyte species having microbial association with higher bioactivities for potential applications in agriculture: (a) Pteris vittata, (b) Azolla sp., (c) Huperzia sp., (d) Adiantum sp., (e) Tectaria sp., (f) Dryopteris sp., and (g) Lygodium sp.

3.3 Application of fern-associated microorganisms for soil bioremediation

3.3.1 Soil contamination with HMs

In general, the HMs having a density higher than 5 g/cm3 are non-biodegradable, toxic, or poisonous even in lower concentrations. The HMs and metalloids, including arsenic (As), chromium (Cr), manganese (Mn), cobalt (Co), nickel (Ni), zinc (Zn), copper (Cu), cadmium (Cd), tin (Sn), lead (Pb), mercury (Hg), and iron (Fe), can result in significant toxic impacts. Some of these metals are known as micronutrients and are required for plant growth, while others have unknown biological functions and are toxic even at low concentrations [26,27,28]. Studies have shown that the increase in HM content in wheat and corn plants near the mines that are under exploitation or abandoned, is higher than in the uncontaminated areas [29]. These contaminants can remain in the environment for decades or centuries, which increases the risk of accumulation of HMs in living organisms and soft tissues, which in turn affects the normal functioning of neurological, immune, gastrointestinal, and cardiovascular systems [30,31]. These HMs can disrupt the normal structure and function of cellular components and impede various metabolic and developmental processes, which ultimately have adverse effects on crop health and productivity [32]. From cultivated land to our food basket, metal contamination has a significant impact on agriculture. Profound exposure of living organisms to these HMs can have harmful effects, especially in the case of human beings. It may cause serious health issues like mental retardation, birth defects, autism, psychosis, and paralysis [33].

3.3.2 Bioremediation of HMs

The bioremediation process is a highly promising, effective, and economical process that is mediated by living organisms, mainly microorganisms and green plants, and their enzymes to remove, degrade, mineralise, transform, and detoxify the hazardous pollutants from the contaminated environment into nontoxic or less toxic forms [34,35]. Even though angiosperms tend to dominate the phytoremediation process, ferns have now been utilised more and more recently as well [36].

Microorganisms are known to play a huge role in the biogeochemical cycle of metal transformations between soluble and insoluble forms [37]. Compared to animals and plants, microorganisms are known to have a greater resistance to environmental stress by transforming the toxic HMs into less toxic or nontoxic forms through metabolic pathways and utilise them for their growth [10]. Various strains of microbes from different sources, such as soil, water, sediments, and plants, have been used as a method of restoration of a contaminated environment. Even though the ability of pteridophytes to remove pollutants has been studied extensively, a lesser number of investigations have been carried out on the microorganisms associated with these groups of plants that could have equal or even more potential for remediation of soil HMs.

3.3.3 Potential of pteridophyte microbiome for soil bioremediation

A notable example of ferns is Pteris vittata, which is known to grow in HM-contaminated soils like mining areas. This species is one of the most common hyperaccumulators of HMs [5,38], i.e. more than 3,000 mg kg−1 as above-ground biomass [38]. Other species belonging to the genus Pteris of order Pteridales are also known as arsenic hyperaccumulators. Apart from this, other ferns like Adiantum capillus veneris and Pityrogramma calomelanos also accumulate arsenic [5], while Nephrolepis cordifolia and Hypolepis muelleri are known as copper (Cu), lead (Pb), zinc (Zn) and nickel (Ni) phyto-stabilisers. Fern belonging to the genus Adiantum are known to be phytoextractors of lead (Pb) and nickel (Ni).

In recent years, fern-associated microorganisms have been utilised majorly to explore the potential for arsenic bioremediation. Most of the studies were confined to bacterial species isolated from the endosphere and rhizosphere of common ferns like Pteris vittata (Chinese Brake) and Pteris multifida (Spider Brake Fern). Bacterial isolates reported from these two plants are more or less similar and mostly belong to genera Bacillus, Pseudomonas, Brevundimonassp, Rhizobium, Acinetobacter, Arthrobacter, Paenarthrobacter, Paeniglutamicibacter, Rhodococcus, Microbacterium, Flavobacterium, Sinorhizobium, Ochrobactrum, Cupriavidus, Serratia, etc. Even studies have revealed 50 times more presence and 3 to 12 times more diversity of bacterial communities and their functional genes (aroA-like) genes in the rhizosphere of P. vittata on amendment of arsenic in the soil [39]. Das [40] reported an alteration of rhizospheric microbiomes of P. vittata upon As-enrichment. The study revealed a noticeable increase in the relative abundance of Proteobacteria (12.3%), Actinobacteria (39.5%), and Chloroflexi (143%), whereas lowered Bacteroidetes (21.6%), Acidobacteria (19%), Verrucomicrobia (9.8%) and Firmicutes (5.6%) composition in the rhizospheric soil. A substantial increase in both soil enzyme activity involved in the carbon, nitrogen, and phosphorus cycle, and fond biomass, as well as an increase in gene abundance of As-transforming bacteria, Fe- and S-reducing bacteria, and N- and C-fixing bacteria, were reported in the rhizosphere of the plant after As-enrichment. All these microorganisms were formerly reported to play a significant role in As-oxidation and reduction.

Most of the isolates not only exhibited the capacity to degrade toxic HMs but also possessed different plant growth-promoting (PGP) attributes, such as the production of IAA, siderophores, P-solubilisation, and ACC deaminase activity [41,42]. Other than arsenic, microbes associated with Pteris vittata also possessed the potential of bioremediation of other HMs like nickel (Ni), vanadium(v), chromium (Cr), and lead (Pb). These potential bacterial strains have been proven to be carrying genes encoding robust responses to HM stress.

3.4 Arsenic bioremediation

According to World Health Organisation reports, at least 140 million people globally are exposed to arsenic at levels exceeding the limits of the provisional guideline values [43]. Arsenic has been declared as the most prevalent hazardous substance in the environment and is classified as a Group 1 carcinogen. Because of its chronic and widespread impacts, there has been a renewed interest in arsenic as a pollutant issue, which has led the US Centres for Disease Control and Prevention to place it at the top of the ATSDR’s Substance Priority List [44,45]. A massive mass poisoning of a population in history, as defined by the World Health Organisation, occurred in Bangladesh, where an estimated 125 million people were exposed to inorganic arsenic from polluted tube wells, causing arsenic to become globally notorious [46]. Recently, in countries like India, China, Argentina and USA, arsenic (As) contamination has become a growing concern for public health [47,48].

Natural arsenic occurs in four oxidation states: arsenate (As(v)), arsenite (As(iii)), elemental arsenic (As(0)), and arsenide (As−III). When combined with other elements, it forms organic and inorganic arsenic. Inorganic compounds are considered to be more toxic than the organic ones. Further, trivalent methylated arsenic has been found to be more dangerous for humans since it can break down DNA more efficiently [49,50].

Microbial diversity associated with Pteridophytes could be exploited as an inexpensive and environmentally friendly tool to reduce arsenic (As) contamination. A study by Han et al. [39,51] revealed that both rhizospheric and endophytic bacteria of Pteris vittata played a significant role in As-transformation. Out of 18 species isolated from tissue extracts of this fern, 9 species belonged to Proteobacteria, 8 Firmicutes, and 1 Bacteroidetes. Rhizobacteria is dominated by phylum Proteobacteria, while 62% of endobacteria belong to Firmicutes. Further investigation showed that As(v) reduction was only found in rhizome and fond extracts at 3.7–24% of As v, whereas 45 and 73% As(iii) oxidation was found in root extract, indicating the role of both Rhizobacteria and endobacteria. Demonstrating the role of rhizospheric bacteria in arsenic bioremediation, Wang et al. [8] cultivated Pteris vittata plants (4–5 fonds) for 2 weeks in hogland solution along with 1 mg L−1 As(iii) in a hydroponic system. Bacterial strains belonging to Acinetobacter sp., Comamonas sp. Flavobacterium sp., Staphylococcus sp., and Pseudomonas sp. were found to be responsible for both As(iii) oxidation and As(v) reduction. Liu et al. [29] reported the potential of catecholate siderophore-producing Pseudomonas sp., previously reported from the rhizosphere of Pteris vittata [52], in bioremediation of Arsenic. The siderophore was found to be effective not only in the dissolution of FeSO4 but also increased the biomass of the plant.

Xu et al. [53] isolated 43 As-resistant bacterial endophytes from Pteris vittata, mostly dominated by Proteobacteria (47%), followed by Actinobacteria (42%), Bacteroidetes (9.3%), and Firmicutes (2.3%). These endophytes mainly consisted of Brevundomonas sp., Rhodococcus sp., Microbacterium sp., and Flavobacterium sp. Among them, six endophytes showed greater growth in the presence of 10 mM of As. Root endophytes were found to be more resistant to As(v), while leaflet endophytes were more tolerant to As(iii). Resistance of bacterial strains to As showed a positive correlation with reduction of As(v). Similarly, Tiwari [54] isolated eight different bacterial root endophytes from Pteris vittata belonging to three families: Proteobacteria, Firmicutes, and Bacteriodetes. Based on a preliminary test, only one isolate demonstrated As tolerance of up to 1,000 mg L−1. The aox gene was observed in two endophytes, indicating As(iii) oxidisation ability, whereas arsB gene was found in six isolates. All the isolates showed higher As-tolerance with a minimum inhibitory concentration ranging from 50 to 1,000 mg L−1.

Gu et al. [55] isolated 116 arsenite-resistant endophytic bacteria from roots of P. vittata with different As concentrations. Based on the 16S rRNA gene sequence analysis, the isolates were categorised into Proteobacteria, Actinobacteria, and Firmicutes, mostly dominated by genera Agrobacterium, Stenotrophomonas, Pseudomonas, Rhodococcus, and Bacillus. The most highly arsenite-resistant bacteria (minimum inhibitory concentration > 45 mM) were isolated from P. vittata with high arsenic concentrations and belonged to the genera Agrobacterium and Bacillus. The strains with high As tolerance also showed high levels of indole-3-acetic acid (IAA) production and carried arsB/ACR3(2) genes. The arsB and ACR3 (2) were most likely horizontally transferred among the strains.

The rhizospheric bacteria Pseudomonas vancouverensis strain m318 isolated from Pteris multifida contains aio-A genes and demonstrated high chemotactic responses as well as colonisation efficiency on roots from P. vittata, suggesting its broad host preferences. As-hyperaccumulation was significantly increased in P. vittata (48–146%) and P. multifida (42–233%) upon inoculation with the strain in field trials [56]. Abou-Shanab [57] evaluated the diversity of rhizospheric bacteria in P. vittate and their interaction in As-contaminated soil. A total of 44 of As-resistant endophytic bacteria were reported belonging to genera Pseudomonas sp., Agrobacterium sp., Paeniglutamicibacter sp., Rhizobium sp., Bacillus sp., Sinorhizobium sp., Ochrobactrum sp., Rhodococcus sp., Cupriavidus sp., Arthrobacter sp., Paeniarthrobacter sp., and Paenibacillus sp. of phyla Proteobacteria, Actinobacteria, and Firmicutes. The majority of these bacteria were resistant to As(v) rather than As(iii). Agnihotri [58] reported the Bacillus cereus strain from the rhizosphere of Azolla microphylla. The strain showed extreme tolerance towards As(v) (2,000 mg L−1) due to the presence of arsC gene, which confirmed the presence of functional ars operon in imparting arsenic resistance (Table 1).

Table 1

Bacterial diversity of ferns and their potential for As bioremediation

Bacterial species Source plant and environment Potential arsenic bioremediation activity Experiment type Reference
Pseudomonas sp., Comamonas sp,. and Stenotrophomonas sp. Rhizospheric soil of Pteris vittata
  1. Production of Siderophores and root exudates

  2. Enhanced plant As-uptake

  3. Increase in P uptake by P. vittata

[52]
Bacillus sp. and Paenibacillus sp. Endophytes of Pteris vittata
  1. Production of Siderophores and IAA

  2. Isolates from P. vittata and P. multifida showed higher tolerance to As(v) and As(iii), respectively

  3. Average IAA productions by isolates from P. multifida were higher than P. vittata.

Green house experiment [59]
Bacillus sp., Paenibacillus sp., Lysinibacillus sp., Massilia sp., Micrococcus sp., Brevundimonas sp., Paracoccus sp., Curtobacterium sp., Roseomonas sp., Staphylococcus sp., Sphingomonas sp., and Microbacterium sp., Endophytes of Pteris multifida
Citrobacter sp. Endophyte of Pteris vittata Bacterial isolates exhibited maximum resistance to As (400 mg L−1) and able to oxidize As(iii) and reduce As(v) Pot culture [60]
Cupriavidus basilensis Rhizobacteria of Pteris vittata
  1. Arsenic tolerance, rapid arsenite oxidation ability

  2. Accumulation of As up to 171% in Pteris vittate

Field trial near a Gold mine [61]
Bacillus sp., Paenarthrobacter ureafaciens, and Beijerinckia fluminensis. Endophyte of Pteris vittata ACC deaminase activity, Siderophore, and IAA production Green house trial [62]

3.4.1 Various mechanisms for arsenic remediation by microorganisms

Microorganisms have adopted several mechanisms for survival under arsenic stress [63,64]. They combat the toxicity of arsenic through intrinsic properties or by using detoxifying mechanisms to survive. Numerous studies have been conducted to investigate these mechanisms underlying the bioremediation process, which includes cytosolic binding, efflux, precipitation, enzymatic and non-enzymatic reduction, and biofilm development. The arsenic biogeochemical cycle is highly dependent upon microbial transformation, which includes specific biochemical pathways (Figure 4) [65,66]. Arsenic accumulation, oxidation, reduction, volatilisation, etc., are different approaches practised by these microbes to resist the metalloid.

Figure 4 
                     Divergent arsenic detoxification mechanisms used by microorganisms.
Figure 4

Divergent arsenic detoxification mechanisms used by microorganisms.

Microbial remediation of arsenic-contaminated soil has proved to be effective, reliable, and sustainable. The degradation of arsenic is a generating process that microbes use for their growth. Arsenite oxidation and arsenate reduction are the most effective methods. Bacterial arsenite is required for the bacterial arsenic oxidation pathway to activate, making it an inducible system [67]. The oxidation of arsenite (As(iii)) to form arsenate (As(v)) is considered an effective detoxification mechanism, which requires a periplasmic soluble enzyme, “arsenite oxidase” [68,69]. Investigation on arsenite oxidation, which is responsible for the detoxification process, reveals the existence of the aox (arsenite oxidising) operon containing the structural (aox A, aox B) and regulatory (aox R, aox S) genes [70]. Similarly, As(v) can also be reduced to As(iii) via two mechanisms, i.e. cytoplasmic arsenate reduction system and dissimilatory As(v) reduction encoded in the arr gene system. Microbial methylation is another multistep arsenic detoxifying method which involves transformation of solid or aqueous inorganic arsenic into gaseous arsines, i.e. arsine (AsH3), monomethylarsine (MeAsH2), dimethylarsine (Me2AsH), and trimethylarsine [71,72] through reduction of As(v), followed by oxidative addition of methyl group [7375]. This process is catalysed by the enzyme As(iii) S-adenosylmethionine methyltransferase in microbes, which is encoded by the arsM genes [76]. The methylation process to mitigate arsenic contamination is under debate since the microbes responsible for the volatilisation of arsines only account for 0.5% of the microbial community [77,78]. However, the byproducts of the process still contain some level of toxicity; thus, many scientists do not consider this as a complete detoxification method [79]. Except these, bioaccumulation and bio-adsorption are also highly adapted by microbes, mostly bacteria, for arsenic removal. Although numerous studies are still being carried out by researchers to explore the arsenic-degradation capacity of the microbes, there is still a gap in knowledge on how to tap the capabilities of these essential microbes to their full potential.

3.5 Bioremediation of other HMs

Serratia marcescens ss marcescens PRE01, an endophyte of hyper-accumulator P. vittata, was reported to possess a significant ability to resist vanadium (1,500 mg L−1), chromium, and cadmium pollutants through the strong V(v) and Cr(vi) reduction and Cd(ii) adsorption. Apart from ACC deaminase activity and P solubilisation (336.41 mg L−1), the strain also exhibited production of IAA (60.14 mg L−1) and siderophore [80]. Pseudomonas spp. PG-12, an efficient rhizospheric bacterial strain isolated from P. vittata, was found to be effective in the bioremediation of HMs in contaminated soil due to its ability to resist multiple metals including cadmium (0.6 mM) and lead (10 mM) combined with the production of plant hormones such as indole acetic acid (IAA) (17.4 µg mL−1), gibberellins (3.54 µg mL−1). Genomic DNA analysis of the strain has identified metal efflux transporters such as PbrA, CadA2, and CzcR, which are likely to play a role in its metal resistance and detoxification. Sporophytes inoculated with the strain showed improved growth, increased P uptake, and reduced Pb uptake to plant tissue [81]. Banach [82] reported higher microbial diversity in Pb, Cd, Cr, Ni, Au, and Ag-treated Azolla filiculoides, an aquatic fern, than in the non-treated plant. The Pb, Cd, and Cr-treated plants were dominated by Cyanobacteria and Proteobacteria, followed by Actinobacteria, Firmicutes, and Bacteroidetes. In contrast, the core microbiome consists of Acinetobacter, Asticcacaulis, Anabaena, Bacillus, Brevundimonas, Burkholderia, Dyella, Methyloversatilis, Rhizobium, and Staphylococcus sp.

Yongpisanphop and Babel [83] reported five different endophytic bacteria from three different plants, including one metalliferous lead excluder fern, Pityrogramma calomelanos. Two endophytic bacteria belonging to genera Pseudomonas (P. psychrophile and P. veronii) were reported from the plant, among which P. veronii showed significant lead absorption potential in comparison to P. psychrophile, whereas both the organisms showed PGP traits as siderophore production and p solublisation activity.

Arbuscular mycorrhizal fungi have been commonly reported from the metal-contaminated sites [84,85]. The mycorrhizal symbiosis is known to help the host plants in nutrient and water uptake, thus enabling the plants in the establishment and survival of the host plant in different environmental niches. A number of studies reported the colonisation of mycorrhizal grasses from polluted sites [86] indicated the metal tolerance ability of AM fungi. Wu [87] reported 22 AM species from the rhizosphere of Pteris vittate collected from the Pb/Zn and As mining sites of China, mostly dominated by the genus Glomus like G. brohultii, G. mosseae, G. microaggregatum, and G. geosporum. Overall, the AM colonization of P. vittate collected from uncontaminated sites was found to be higher than the contaminated sites.

3.6 Bioremediation of oil/diesel contamination

Cohen et al. [88] conducted a field experiment to investigate diesel remediation by using aquatic fern Azolla pinnata, Pistia stratiotes, and Salvinia molesta. During the experiment, the bacterial colony that appeared after the death of the plant was reported to have dense growth in a 4% diesel-containing mineral salts medium and was found to lower the fluorescence from aromatic compounds by approximately 50% after 19 days. Similarly, Somiari et al. [89] reported bacterial endophytes Pseudomonas sp., Bacillus sp., Klebsiella sp., Nitrobacter sp., Staphylococcus sp., Nitrosomonas sp., Azotobacter sp., and Micrococcus sp., isolated from roots of three mangrove plants including golden leather fern, i.e. Acrostichum aureum were capable of degrading crude oil. Out of these, the former two demonstrated the highest potential, i.e. 70 and 52.5%.

Though Pteridophyte-associated microbes have a great potential for soil bioremediation, there is still a huge gap in research regarding their practical utilisation. The bacterial isolates belonging to Proteobacteria, Actinobacteria, Firmicutes, Bacteroidetes were also formerly reported as active HM accumulators [9093]. Hence, more studies need to be carried out on this group of bacteria in association with pteridophytes. In contrast, the potential of fungal diversity in these plants is still to be explored. The correlation between the plant growth hormone production (IAA) and bioremediation of HMs by microbes has also been reported in many studies [81], which indicates that these microorganisms not only accumulate toxic pollutants but also help the plants to thrive in adverse environments. The pathway and molecular interrelation among the two phenomena need to be studied more for better utilisation of these microbes.

3.7 Perspectives in the Odisha State of India

India is one of the 17 mega biodiverse countries of the world, known for its unique flora and fauna. The State of Odisha is situated in the eastern part of India and is one of the four maritime States bordering the Bay of Bengal. Due to its peculiar geographical locations, topography, and varied edaphic and climatic conditions, the biodiversity of Odisha is rich in terms of species richness. Physiographically, the state can be divided into four regions, viz., Northern Plateau, Eastern Ghats, Central Tableland, and Coastal Plains. According to Indian State Forest Report, 2021, the State of Odisha has a 33.5% forest coverage, which belongs to 19 forest types under 4 categories. Around 1,200 species of pteridophytes belonging to 70 families and 191 genera are found in India, whereas around 176 species are expected to occur in Odisha [94]. These are predominately distributed in forest areas that have mineral-rich soil (mining areas) and sufficient moisture. Besides these, many fern species also occur in wetlands, damp areas and coastal forests like mangroves in Bhitarkanika National Park. In spite of this vast biodiversity, to date, hardly any studies have been carried out in Odisha regarding the microbial association with pteridophytes. In India, few reports are available from the northeastern part only, and that is only restricted to some specific species. Most of these studies have focused more on diversity than their applicability. Results of preliminary experiments carried out by the authors of this article showed that both bacterial and fungal species, which have been isolated from pteridophytes existing in various forest-rich areas of Odisha, have tremendous potentials like antagonistic activity, enzyme production, and other traits for utilisation in agriculture. More exploration is underway for the identification of beneficial microbes and their utilisation in the composting of forest leaf litter and other biowastes.

4 Conclusions

Pteridophytes are still considered as understudied division under Kingdom Plantae. They hold a unique identity between the cryptogams and phanerogams and are considered critical drivers of succession. Although they are less conspicuous than other vascular plants, but they often contribute to the build-up of plant biomass and soil fertility. Since pteridophytes are host to numerous microorganisms that have potential for agricultural applications, extensive studies are required for a deep insight into their ability to decontaminate HMs from soil, which could be applied for agricultural purposes. Though metagenomics investigations have explored the genetic diversity of the fern microbiomes, a greater number of in vitro experiments need to be carried out and further translated into field applications. Since these lower plant groups are not preferred by herbivores, identification of potential pteridophytes and management of their associated microbial diversity could play a crucial role in the restoration of contaminated soil in the near future. This may open a path to greener ways of agriculture in areas with soil stress contaminated with HMs.


tel: +91-9853831959

Acknowledgments

The authors are grateful to the Chairman and Member Secretary, Odisha Biodiversity Board, Bhubaneswar, India.

  1. Funding information: Authors state no funding involved.

  2. Author contributions: S.N.: conceptualised the theme and supervised the work overall; Y.R.: drafted the manuscript; S.S.S., M.G., and D.D.: carried out literature survey, diagram/figure designing, and proof reading.

  3. Conflict of interest: Authors state no conflict of interest.

  4. Data availability statement: Data sharing is not applicable to this article as no datasets were generated or analysed during the current study.

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Received: 2023-12-13
Revised: 2024-03-30
Accepted: 2024-04-02
Published Online: 2024-05-31

© 2024 the author(s), published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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  22. Sirtuin 5 regulates acute myeloid leukemia cell viability and apoptosis by succinylation modification of glycine decarboxylase
  23. Apigenin 7-glucoside impedes hypoxia-induced malignant phenotypes of cervical cancer cells in a p16-dependent manner
  24. KAT2A changes the function of endometrial stromal cells via regulating the succinylation of ENO1
  25. Current state of research on copper complexes in the treatment of breast cancer
  26. Exploring antioxidant strategies in the pathogenesis of ALS
  27. Helicobacter pylori causes gastric dysbacteriosis in chronic gastritis patients
  28. IL-33/soluble ST2 axis is associated with radiation-induced cardiac injury
  29. The predictive value of serum NLR, SII, and OPNI for lymph node metastasis in breast cancer patients with internal mammary lymph nodes after thoracoscopic surgery
  30. Carrying SNP rs17506395 (T > G) in TP63 gene and CCR5Δ32 mutation associated with the occurrence of breast cancer in Burkina Faso
  31. P2X7 receptor: A receptor closely linked with sepsis-associated encephalopathy
  32. Probiotics for inflammatory bowel disease: Is there sufficient evidence?
  33. Identification of KDM4C as a gene conferring drug resistance in multiple myeloma
  34. Microbial perspective on the skin–gut axis and atopic dermatitis
  35. Thymosin α1 combined with XELOX improves immune function and reduces serum tumor markers in colorectal cancer patients after radical surgery
  36. Highly specific vaginal microbiome signature for gynecological cancers
  37. Sample size estimation for AQP4-IgG seropositive optic neuritis: Retinal damage detection by optical coherence tomography
  38. The effects of SDF-1 combined application with VEGF on femoral distraction osteogenesis in rats
  39. Fabrication and characterization of gold nanoparticles using alginate: In vitro and in vivo assessment of its administration effects with swimming exercise on diabetic rats
  40. Mitigating digestive disorders: Action mechanisms of Mediterranean herbal active compounds
  41. Distribution of CYP2D6 and CYP2C19 gene polymorphisms in Han and Uygur populations with breast cancer in Xinjiang, China
  42. VSP-2 attenuates secretion of inflammatory cytokines induced by LPS in BV2 cells by mediating the PPARγ/NF-κB signaling pathway
  43. Factors influencing spontaneous hypothermia after emergency trauma and the construction of a predictive model
  44. Long-term administration of morphine specifically alters the level of protein expression in different brain regions and affects the redox state
  45. Application of metagenomic next-generation sequencing technology in the etiological diagnosis of peritoneal dialysis-associated peritonitis
  46. Clinical diagnosis, prevention, and treatment of neurodyspepsia syndrome using intelligent medicine
  47. Case report: Successful bronchoscopic interventional treatment of endobronchial leiomyomas
  48. Preliminary investigation into the genetic etiology of short stature in children through whole exon sequencing of the core family
  49. Cystic adenomyoma of the uterus: Case report and literature review
  50. Mesoporous silica nanoparticles as a drug delivery mechanism
  51. Dynamic changes in autophagy activity in different degrees of pulmonary fibrosis in mice
  52. Vitamin D deficiency and inflammatory markers in type 2 diabetes: Big data insights
  53. Lactate-induced IGF1R protein lactylation promotes proliferation and metabolic reprogramming of lung cancer cells
  54. Meta-analysis on the efficacy of allogeneic hematopoietic stem cell transplantation to treat malignant lymphoma
  55. Mitochondrial DNA drives neuroinflammation through the cGAS-IFN signaling pathway in the spinal cord of neuropathic pain mice
  56. Application value of artificial intelligence algorithm-based magnetic resonance multi-sequence imaging in staging diagnosis of cervical cancer
  57. Embedded monitoring system and teaching of artificial intelligence online drug component recognition
  58. Investigation into the association of FNDC1 and ADAMTS12 gene expression with plumage coloration in Muscovy ducks
  59. Yak meat content in feed and its impact on the growth of rats
  60. A rare case of Richter transformation with breast involvement: A case report and literature review
  61. First report of Nocardia wallacei infection in an immunocompetent patient in Zhejiang province
  62. Rhodococcus equi and Brucella pulmonary mass in immunocompetent: A case report and literature review
  63. Downregulation of RIP3 ameliorates the left ventricular mechanics and function after myocardial infarction via modulating NF-κB/NLRP3 pathway
  64. Evaluation of the role of some non-enzymatic antioxidants among Iraqi patients with non-alcoholic fatty liver disease
  65. The role of Phafin proteins in cell signaling pathways and diseases
  66. Ten-year anemia as initial manifestation of Castleman disease in the abdominal cavity: A case report
  67. Coexistence of hereditary spherocytosis with SPTB P.Trp1150 gene variant and Gilbert syndrome: A case report and literature review
  68. Utilization of convolutional neural networks to analyze microscopic images for high-throughput screening of mesenchymal stem cells
  69. Exploratory evaluation supported by experimental and modeling approaches of Inula viscosa root extract as a potent corrosion inhibitor for mild steel in a 1 M HCl solution
  70. Imaging manifestations of ductal adenoma of the breast: A case report
  71. Gut microbiota and sleep: Interaction mechanisms and therapeutic prospects
  72. Isomangiferin promotes the migration and osteogenic differentiation of rat bone marrow mesenchymal stem cells
  73. Prognostic value and microenvironmental crosstalk of exosome-related signatures in human epidermal growth factor receptor 2 positive breast cancer
  74. Circular RNAs as potential biomarkers for male severe sepsis
  75. Knockdown of Stanniocalcin-1 inhibits growth and glycolysis in oral squamous cell carcinoma cells
  76. The expression and biological role of complement C1s in esophageal squamous cell carcinoma
  77. A novel GNAS mutation in pseudohypoparathyroidism type 1a with articular flexion deformity: A case report
  78. Predictive value of serum magnesium levels for prognosis in patients with non-small cell lung cancer undergoing EGFR-TKI therapy
  79. HSPB1 alleviates acute-on-chronic liver failure via the P53/Bax pathway
  80. IgG4-related disease complicated by PLA2R-associated membranous nephropathy: A case report
  81. Baculovirus-mediated endostatin and angiostatin activation of autophagy through the AMPK/AKT/mTOR pathway inhibits angiogenesis in hepatocellular carcinoma
  82. Metformin mitigates osteoarthritis progression by modulating the PI3K/AKT/mTOR signaling pathway and enhancing chondrocyte autophagy
  83. Evaluation of the activity of antimicrobial peptides against bacterial vaginosis
  84. Atypical presentation of γ/δ mycosis fungoides with an unusual phenotype and SOCS1 mutation
  85. Analysis of the microecological mechanism of diabetic kidney disease based on the theory of “gut–kidney axis”: A systematic review
  86. Omega-3 fatty acids prevent gestational diabetes mellitus via modulation of lipid metabolism
  87. Refractory hypertension complicated with Turner syndrome: A case report
  88. Interaction of ncRNAs and the PI3K/AKT/mTOR pathway: Implications for osteosarcoma
  89. Association of low attenuation area scores with pulmonary function and clinical prognosis in patients with chronic obstructive pulmonary disease
  90. Long non-coding RNAs in bone formation: Key regulators and therapeutic prospects
  91. The deubiquitinating enzyme USP35 regulates the stability of NRF2 protein
  92. Neutrophil-to-lymphocyte ratio and platelet-to-lymphocyte ratio as potential diagnostic markers for rebleeding in patients with esophagogastric variceal bleeding
  93. G protein-coupled receptor 1 participating in the mechanism of mediating gestational diabetes mellitus by phosphorylating the AKT pathway
  94. LL37-mtDNA regulates viability, apoptosis, inflammation, and autophagy in lipopolysaccharide-treated RLE-6TN cells by targeting Hsp90aa1
  95. The analgesic effect of paeoniflorin: A focused review
  96. Chemical composition’s effect on Solanum nigrum Linn.’s antioxidant capacity and erythrocyte protection: Bioactive components and molecular docking analysis
  97. Knockdown of HCK promotes HREC cell viability and inner blood–retinal barrier integrity by regulating the AMPK signaling pathway
  98. The role of rapamycin in the PINK1/Parkin signaling pathway in mitophagy in podocytes
  99. Laryngeal non-Hodgkin lymphoma: Report of four cases and review of the literature
  100. Clinical value of macrogenome next-generation sequencing on infections
  101. Overview of dendritic cells and related pathways in autoimmune uveitis
  102. TAK-242 alleviates diabetic cardiomyopathy via inhibiting pyroptosis and TLR4/CaMKII/NLRP3 pathway
  103. Hypomethylation in promoters of PGC-1α involved in exercise-driven skeletal muscular alterations in old age
  104. Profile and antimicrobial susceptibility patterns of bacteria isolated from effluents of Kolladiba and Debark hospitals
  105. The expression and clinical significance of syncytin-1 in serum exosomes of hepatocellular carcinoma patients
  106. A histomorphometric study to evaluate the therapeutic effects of biosynthesized silver nanoparticles on the kidneys infected with Plasmodium chabaudi
  107. PGRMC1 and PAQR4 are promising molecular targets for a rare subtype of ovarian cancer
  108. Analysis of MDA, SOD, TAOC, MNCV, SNCV, and TSS scores in patients with diabetes peripheral neuropathy
  109. SLIT3 deficiency promotes non-small cell lung cancer progression by modulating UBE2C/WNT signaling
  110. The relationship between TMCO1 and CALR in the pathological characteristics of prostate cancer and its effect on the metastasis of prostate cancer cells
  111. Heterogeneous nuclear ribonucleoprotein K is a potential target for enhancing the chemosensitivity of nasopharyngeal carcinoma
  112. PHB2 alleviates retinal pigment epithelium cell fibrosis by suppressing the AGE–RAGE pathway
  113. Anti-γ-aminobutyric acid-B receptor autoimmune encephalitis with syncope as the initial symptom: Case report and literature review
  114. Comparative analysis of chloroplast genome of Lonicera japonica cv. Damaohua
  115. Human umbilical cord mesenchymal stem cells regulate glutathione metabolism depending on the ERK–Nrf2–HO-1 signal pathway to repair phosphoramide mustard-induced ovarian cancer cells
  116. Electroacupuncture on GB acupoints improves osteoporosis via the estradiol–PI3K–Akt signaling pathway
  117. Renalase protects against podocyte injury by inhibiting oxidative stress and apoptosis in diabetic nephropathy
  118. Review: Dicranostigma leptopodum: A peculiar plant of Papaveraceae
  119. Combination effect of flavonoids attenuates lung cancer cell proliferation by inhibiting the STAT3 and FAK signaling pathway
  120. Renal microangiopathy and immune complex glomerulonephritis induced by anti-tumour agents: A case report
  121. Correlation analysis of AVPR1a and AVPR2 with abnormal water and sodium and potassium metabolism in rats
  122. Gastrointestinal health anti-diarrheal mixture relieves spleen deficiency-induced diarrhea through regulating gut microbiota
  123. Myriad factors and pathways influencing tumor radiotherapy resistance
  124. Exploring the effects of culture conditions on Yapsin (YPS) gene expression in Nakaseomyces glabratus
  125. Screening of prognostic core genes based on cell–cell interaction in the peripheral blood of patients with sepsis
  126. Coagulation factor II thrombin receptor as a promising biomarker in breast cancer management
  127. Ileocecal mucinous carcinoma misdiagnosed as incarcerated hernia: A case report
  128. Methyltransferase like 13 promotes malignant behaviors of bladder cancer cells through targeting PI3K/ATK signaling pathway
  129. The debate between electricity and heat, efficacy and safety of irreversible electroporation and radiofrequency ablation in the treatment of liver cancer: A meta-analysis
  130. ZAG promotes colorectal cancer cell proliferation and epithelial–mesenchymal transition by promoting lipid synthesis
  131. Baicalein inhibits NLRP3 inflammasome activation and mitigates placental inflammation and oxidative stress in gestational diabetes mellitus
  132. Impact of SWCNT-conjugated senna leaf extract on breast cancer cells: A potential apoptotic therapeutic strategy
  133. MFAP5 inhibits the malignant progression of endometrial cancer cells in vitro
  134. Major ozonated autohemotherapy promoted functional recovery following spinal cord injury in adult rats via the inhibition of oxidative stress and inflammation
  135. Axodendritic targeting of TAU and MAP2 and microtubule polarization in iPSC-derived versus SH-SY5Y-derived human neurons
  136. Differential expression of phosphoinositide 3-kinase/protein kinase B and Toll-like receptor/nuclear factor kappa B signaling pathways in experimental obesity Wistar rat model
  137. The therapeutic potential of targeting Oncostatin M and the interleukin-6 family in retinal diseases: A comprehensive review
  138. BA inhibits LPS-stimulated inflammatory response and apoptosis in human middle ear epithelial cells by regulating the Nf-Kb/Iκbα axis
  139. Role of circRMRP and circRPL27 in chronic obstructive pulmonary disease
  140. Investigating the role of hyperexpressed HCN1 in inducing myocardial infarction through activation of the NF-κB signaling pathway
  141. Characterization of phenolic compounds and evaluation of anti-diabetic potential in Cannabis sativa L. seeds: In vivo, in vitro, and in silico studies
  142. Quantitative immunohistochemistry analysis of breast Ki67 based on artificial intelligence
  143. Ecology and Environmental Science
  144. Screening of different growth conditions of Bacillus subtilis isolated from membrane-less microbial fuel cell toward antimicrobial activity profiling
  145. Degradation of a mixture of 13 polycyclic aromatic hydrocarbons by commercial effective microorganisms
  146. Evaluation of the impact of two citrus plants on the variation of Panonychus citri (Acari: Tetranychidae) and beneficial phytoseiid mites
  147. Prediction of present and future distribution areas of Juniperus drupacea Labill and determination of ethnobotany properties in Antalya Province, Türkiye
  148. Population genetics of Todarodes pacificus (Cephalopoda: Ommastrephidae) in the northwest Pacific Ocean via GBS sequencing
  149. A comparative analysis of dendrometric, macromorphological, and micromorphological characteristics of Pistacia atlantica subsp. atlantica and Pistacia terebinthus in the middle Atlas region of Morocco
  150. Macrofungal sporocarp community in the lichen Scots pine forests
  151. Assessing the proximate compositions of indigenous forage species in Yemen’s pastoral rangelands
  152. Food Science
  153. Gut microbiota changes associated with low-carbohydrate diet intervention for obesity
  154. Reexamination of Aspergillus cristatus phylogeny in dark tea: Characteristics of the mitochondrial genome
  155. Differences in the flavonoid composition of the leaves, fruits, and branches of mulberry are distinguished based on a plant metabolomics approach
  156. Investigating the impact of wet rendering (solventless method) on PUFA-rich oil from catfish (Clarias magur) viscera
  157. Non-linear associations between cardiovascular metabolic indices and metabolic-associated fatty liver disease: A cross-sectional study in the US population (2017–2020)
  158. Knockdown of USP7 alleviates atherosclerosis in ApoE-deficient mice by regulating EZH2 expression
  159. Utility of dairy microbiome as a tool for authentication and traceability
  160. Agriculture
  161. Enhancing faba bean (Vicia faba L.) productivity through establishing the area-specific fertilizer rate recommendation in southwest Ethiopia
  162. Impact of novel herbicide based on synthetic auxins and ALS inhibitor on weed control
  163. Perspectives of pteridophytes microbiome for bioremediation in agricultural applications
  164. Fertilizer application parameters for drip-irrigated peanut based on the fertilizer effect function established from a “3414” field trial
  165. Improving the productivity and profitability of maize (Zea mays L.) using optimum blended inorganic fertilization
  166. Application of leaf multispectral analyzer in comparison to hyperspectral device to assess the diversity of spectral reflectance indices in wheat genotypes
  167. Animal Sciences
  168. Knockdown of ANP32E inhibits colorectal cancer cell growth and glycolysis by regulating the AKT/mTOR pathway
  169. Development of a detection chip for major pathogenic drug-resistant genes and drug targets in bovine respiratory system diseases
  170. Exploration of the genetic influence of MYOT and MB genes on the plumage coloration of Muscovy ducks
  171. Transcriptome analysis of adipose tissue in grazing cattle: Identifying key regulators of fat metabolism
  172. Comparison of nutritional value of the wild and cultivated spiny loaches at three growth stages
  173. Transcriptomic analysis of liver immune response in Chinese spiny frog (Quasipaa spinosa) infected with Proteus mirabilis
  174. Disruption of BCAA degradation is a critical characteristic of diabetic cardiomyopathy revealed by integrated transcriptome and metabolome analysis
  175. Plant Sciences
  176. Effect of long-term in-row branch covering on soil microorganisms in pear orchards
  177. Photosynthetic physiological characteristics, growth performance, and element concentrations reveal the calcicole–calcifuge behaviors of three Camellia species
  178. Transcriptome analysis reveals the mechanism of NaHCO3 promoting tobacco leaf maturation
  179. Bioinformatics, expression analysis, and functional verification of allene oxide synthase gene HvnAOS1 and HvnAOS2 in qingke
  180. Water, nitrogen, and phosphorus coupling improves gray jujube fruit quality and yield
  181. Improving grape fruit quality through soil conditioner: Insights from RNA-seq analysis of Cabernet Sauvignon roots
  182. Role of Embinin in the reabsorption of nucleus pulposus in lumbar disc herniation: Promotion of nucleus pulposus neovascularization and apoptosis of nucleus pulposus cells
  183. Revealing the effects of amino acid, organic acid, and phytohormones on the germination of tomato seeds under salinity stress
  184. Combined effects of nitrogen fertilizer and biochar on the growth, yield, and quality of pepper
  185. Comprehensive phytochemical and toxicological analysis of Chenopodium ambrosioides (L.) fractions
  186. Impact of “3414” fertilization on the yield and quality of greenhouse tomatoes
  187. Exploring the coupling mode of water and fertilizer for improving growth, fruit quality, and yield of the pear in the arid region
  188. Metagenomic analysis of endophytic bacteria in seed potato (Solanum tuberosum)
  189. Antibacterial, antifungal, and phytochemical properties of Salsola kali ethanolic extract
  190. Exploring the hepatoprotective properties of citronellol: In vitro and in silico studies on ethanol-induced damage in HepG2 cells
  191. Enhanced osmotic dehydration of watermelon rind using honey–sucrose solutions: A study on pre-treatment efficacy and mass transfer kinetics
  192. Effects of exogenous 2,4-epibrassinolide on photosynthetic traits of 53 cowpea varieties under NaCl stress
  193. Comparative transcriptome analysis of maize (Zea mays L.) seedlings in response to copper stress
  194. An optimization method for measuring the stomata in cassava (Manihot esculenta Crantz) under multiple abiotic stresses
  195. Fosinopril inhibits Ang II-induced VSMC proliferation, phenotype transformation, migration, and oxidative stress through the TGF-β1/Smad signaling pathway
  196. Antioxidant and antimicrobial activities of Salsola imbricata methanolic extract and its phytochemical characterization
  197. Bioengineering and Biotechnology
  198. Absorbable calcium and phosphorus bioactive membranes promote bone marrow mesenchymal stem cells osteogenic differentiation for bone regeneration
  199. New advances in protein engineering for industrial applications: Key takeaways
  200. An overview of the production and use of Bacillus thuringiensis toxin
  201. Research progress of nanoparticles in diagnosis and treatment of hepatocellular carcinoma
  202. Bioelectrochemical biosensors for water quality assessment and wastewater monitoring
  203. PEI/MMNs@LNA-542 nanoparticles alleviate ICU-acquired weakness through targeted autophagy inhibition and mitochondrial protection
  204. Unleashing of cytotoxic effects of thymoquinone-bovine serum albumin nanoparticles on A549 lung cancer cells
  205. Erratum
  206. Erratum to “Investigating the association between dietary patterns and glycemic control among children and adolescents with T1DM”
  207. Erratum to “Activation of hypermethylated P2RY1 mitigates gastric cancer by promoting apoptosis and inhibiting proliferation”
  208. Retraction
  209. Retraction to “MiR-223-3p regulates cell viability, migration, invasion, and apoptosis of non-small cell lung cancer cells by targeting RHOB”
  210. Retraction to “A data mining technique for detecting malignant mesothelioma cancer using multiple regression analysis”
  211. Special Issue on Advances in Neurodegenerative Disease Research and Treatment
  212. Transplantation of human neural stem cell prevents symptomatic motor behavior disability in a rat model of Parkinson’s disease
  213. Special Issue on Multi-omics
  214. Inflammasome complex genes with clinical relevance suggest potential as therapeutic targets for anti-tumor drugs in clear cell renal cell carcinoma
  215. Gastroesophageal varices in primary biliary cholangitis with anti-centromere antibody positivity: Early onset?
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