Anatomical adaptations of the desert species Stipa lagascae against drought stress
-
Façal Boughalleb
,
Raoudha Abdellaoui
Abstract
Stipa lagascae R. & Sch. (perennial bunchgrass) is one of the most promising steppic species for arid and desert lands of Tunisia. The present study was designed to study the effect of drought on root and leaf anatomy, water relationship, and the growth of three- month-old S. lagascae plants, submitted to water deficit (5, 10, 15, 20, 30 days of withheld irrigation) and grown in pots in greenhouse conditions. The results show that water deficit treatments reduced the biomass accumulation (MS) and leaf water potential (Ψw) of plants. However, leaf relative water content (RWC) decreased significantly only at severe drought. The root’s anatomical features showed reduced root cross-sectional diameter under water deficit. Conversely, epidermis was unaffected by water stress. Moderate and/or severe water deficit (20-30 days) reduced significantly the cortex thickness, cortical cell size, stele diameter, xylem vessel diameter and the stele/root crosssectional ratio, while the number of cortical cells increased for severe water deficit. The cuticles and mesophyll of S. lagascae was thickened by moderate to severe drought and the entire lamina thickness was increased significantly by 5.8% only after 30 days of water deficit while epidermis was unaffected by water deficit. However, severe water deficit (30 days) decreased the width and the length of the bundle sheath. At the same time, the mesophyll cells size and both the xylem and phloem vessels diameter diminished by 12, 16.8 and 17.5%, respectively. Leaf rolling occurs as a response to water deficit and its level increases as the drought period is progressing in plants while reduced bulliform cells size occurred only at severe water deficit. Our findings suggest a complex network of root and leaf anatomical adaptations such as a reduced vessel size with lesser cortical and mesophyll parenchyma formation and increased leaf rolling. These proprieties are required for the maintenance of water potential and energy storage under water stress which can improve the resistance of S. lagascae to survive in extremely arid areas
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Articles in the same Issue
- Down into the Earth: microbial diversity of the deepest cave of the world
- Factors influencing synergistic antimicrobial activity of thymol and nisin against Shigella spp. in sugarcane juice
- Effects of low-temperature hardening on the biochemical response of winter oilseed rape seedlings inoculated with the spores of Leptosphaeria maculans
- Mitochondrial structures during seed germination and early seedling development in Arabidopsis thaliana
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- Different components of plant diversity suggest the protection of a large area for the conservation of a riparian ecosystem
- Anatomical adaptations of the desert species Stipa lagascae against drought stress
- Effects of ammonium ion on cell growth and biosynthesis of shikonin derivatives in callus tissues of Arnebia euchroma
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- Substrate choice by the alien snail Ferrissia fragilis (Gastropoda: Planorbidae) in an industrial area: A case study in a forest pond (Southern Poland)
- History of two critically endangered grassland snails (Pulmonata: Helicellinae) in the Czech Republic with first molecular data on extinct populations
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- Lithobius (Ezembius) laevidentata sp. n., a new species (Chilopoda: Lithobiomorpha: Lithobiidae) from the Northwest region of China
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Articles in the same Issue
- Down into the Earth: microbial diversity of the deepest cave of the world
- Factors influencing synergistic antimicrobial activity of thymol and nisin against Shigella spp. in sugarcane juice
- Effects of low-temperature hardening on the biochemical response of winter oilseed rape seedlings inoculated with the spores of Leptosphaeria maculans
- Mitochondrial structures during seed germination and early seedling development in Arabidopsis thaliana
- Transcriptome analysis for identification of indigo biosynthesis pathway genes in Polygonum tinctorium
- Different components of plant diversity suggest the protection of a large area for the conservation of a riparian ecosystem
- Anatomical adaptations of the desert species Stipa lagascae against drought stress
- Effects of ammonium ion on cell growth and biosynthesis of shikonin derivatives in callus tissues of Arnebia euchroma
- cDNA cloning, heterologous expression and characterization of a cell wall invertase from copper tolerant population of Elsholtzia haichowensis
- Construction of cDNA library from Prunus campanulata leaves and preliminary expressed sequence tag (EST) analysis during cold stress
- Phylogenetic utility of the geometric model of the body form in leeches (Clitellata: Hirudinida)
- Substrate choice by the alien snail Ferrissia fragilis (Gastropoda: Planorbidae) in an industrial area: A case study in a forest pond (Southern Poland)
- History of two critically endangered grassland snails (Pulmonata: Helicellinae) in the Czech Republic with first molecular data on extinct populations
- Monteustium marezensis gen. n., sp. n. and the first record of Italustiun eframi (Acari: Prostigmata: Erythraeidae: Balaustiinae) from Montenegro
- Lithobius (Ezembius) laevidentata sp. n., a new species (Chilopoda: Lithobiomorpha: Lithobiidae) from the Northwest region of China
- Aphids in jeopardy? Aphid communities on xerothermic habitats
- Habitat and weather requirements of diurnal raptors wintering in river valleys
