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Physiological responses of Enhalus acoroides to osmotic stress

  • Pimpanit Kongrueang

    Pimpanit Kongrueang is a Master’s student of botany at the Department of Biology, Prince of Songkla University. She is focusing on salinity stress in seagrasses and her thesis is entitled “Gene expression and physiological analysis of seagrass Enhalus acoroides (L. f.) Royle under salt stress.”

         , Pimchanok Buapet

    Pimchanok Buapet is a lecturer and researcher at Department of Biology, Prince of Songkla University. She earned a PhD in 2014 from Stockholm University in plant physiology by studying the photosynthesis of the seagrass Zostera marina and other macrophytes. Her research interest is ecophysiology of marine plants, in particular, the photoprotective mechanisms of intertidal seagrasses.

         and Peerapat Roongsattham

    Peerapat Roongsattham is a lecturer at the Department of Biology, Prince of Songkla University. He was awarded his PhD by University of Montpellier II, France, for his work on cell separation processes that underlie fruit abscission and shedding in oil palm. Currently, he is interested stress responses in seagrasses, especially the gene expression aspect.

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Published/Copyright: May 25, 2018
Botanica Marina
From the journal Botanica Marina Volume 61 Issue 3

Abstract

This study aims to examine photophysiological and osmotic responses in seedlings of the seagrass Enhalus acoroides after exposure to different salinity levels. Seagrass seedlings were grown for 20 days in control (salinity 30), hyposaline (salinity 10 and 20) and hypersaline (salinity 40 and 50) conditions. The present study showed that both hypo- and hypersaline conditions affected the photophysiology of E. acoroides seedlings, reducing the maximum quantum yield of photosystem II (Fv/Fm) and total chlorophyll content. The photosynthetic system appeared to be more sensitive to hyposaline than to hypersaline conditions as shown by immediate declines in Fv/Fm and total chlorophyll content. Hyposaline conditions increased the water content in roots. The increase in tissue Na+ content induced by hypersalinity did not affect photosynthetic integrity and was more pronounced in leaves than in roots. It is concluded that the ionic homeostasis of E. acoroides seedlings is less affected by short-term hypersalinity than by hyposalinity. The K+/Na+ ratios in leaves with hypersalinity decreased by 20 days after treatment. Additionally, the photosynthetic efficiency (Fv/Fm and total chlorophyll content) is highly sensitive to salinity shifts and can be used as a marker for short-term acclimation to salinity stress in this seagrass species.

Keywords: Enhalus acoroides; osmotic stress; photosynthesis; salinity stress; seagrass

About the authors

Pimpanit Kongrueang

Pimpanit Kongrueang is a Master’s student of botany at the Department of Biology, Prince of Songkla University. She is focusing on salinity stress in seagrasses and her thesis is entitled “Gene expression and physiological analysis of seagrass Enhalus acoroides (L. f.) Royle under salt stress.”

Pimchanok Buapet

Pimchanok Buapet is a lecturer and researcher at Department of Biology, Prince of Songkla University. She earned a PhD in 2014 from Stockholm University in plant physiology by studying the photosynthesis of the seagrass Zostera marina and other macrophytes. Her research interest is ecophysiology of marine plants, in particular, the photoprotective mechanisms of intertidal seagrasses.

Peerapat Roongsattham

Peerapat Roongsattham is a lecturer at the Department of Biology, Prince of Songkla University. He was awarded his PhD by University of Montpellier II, France, for his work on cell separation processes that underlie fruit abscission and shedding in oil palm. Currently, he is interested stress responses in seagrasses, especially the gene expression aspect.

Acknowledgements

This work was supported by the Faculty of Science Research Fund, Prince of Songkla University, contract no. 2-2556-02-026, the Graduate Student Scholarship (2016) of the National Research Council of Thailand, Graduate School and the Department of Biology, Prince of Songkla University. We also would like to thank Dr. Nattawut Leelakanok for critical suggestions and Mr. Banjong Naruepornmetee for field collection and seedling nursery.

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Received: 2017-11-30
Accepted: 2018-4-24
Published Online: 2018-5-25
Published in Print: 2018-6-27

©2018 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. In this issue
  3. Editorial
  4. Seagrass research in Southeast Asia
  5. Ecology
  6. The diet and feeding rates of gastropod grazers in Singapore’s seagrass meadows
  7. Complex yet fauna-deficient seagrass ecosystems at risk in southern Myanmar
  8. Species richness effects on the vegetative expansion of transplanted seagrass in Indonesia
  9. Spatial and temporal distribution of submerged aquatic vegetation in a tropical coastal lagoon habitat in Viet Nam
  10. Species diversity and distribution of seagrasses from the South Andaman, Andaman and Nicobar Islands, India
  11. Genetics and physiology
  12. Population genetic subdivision of seagrasses, Syringodium isoetifolium and Thalassia hemprichii, in the Indonesian Archipelago
  13. Photosynthetic and antioxidant responses of the tropical intertidal seagrasses Halophila ovalis and Thalassia hemprichii to moderate and high irradiances
  14. Physiological responses of Enhalus acoroides to osmotic stress
  15. Management and applications
  16. Seagrass in Southeast Asia: a review of status and knowledge gaps, and a road map for conservation
  17. Decadal biomass and area changes in a multi-species meadow in Singapore: application of multi-resolution satellite imagery
  18. A proposed decision support tool for prioritising conservation planning of Southeast Asian seagrass meadows: combined approaches based on ecosystem services and vulnerability analyses
https://doi.org/10.1515/bot-2017-0108
Keywords for this article
Enhalus acoroides; osmotic stress; photosynthesis; salinity stress; seagrass

Articles in the same Issue

  1. Frontmatter
  2. In this issue
  3. Editorial
  4. Seagrass research in Southeast Asia
  5. Ecology
  6. The diet and feeding rates of gastropod grazers in Singapore’s seagrass meadows
  7. Complex yet fauna-deficient seagrass ecosystems at risk in southern Myanmar
  8. Species richness effects on the vegetative expansion of transplanted seagrass in Indonesia
  9. Spatial and temporal distribution of submerged aquatic vegetation in a tropical coastal lagoon habitat in Viet Nam
  10. Species diversity and distribution of seagrasses from the South Andaman, Andaman and Nicobar Islands, India
  11. Genetics and physiology
  12. Population genetic subdivision of seagrasses, Syringodium isoetifolium and Thalassia hemprichii, in the Indonesian Archipelago
  13. Photosynthetic and antioxidant responses of the tropical intertidal seagrasses Halophila ovalis and Thalassia hemprichii to moderate and high irradiances
  14. Physiological responses of Enhalus acoroides to osmotic stress
  15. Management and applications
  16. Seagrass in Southeast Asia: a review of status and knowledge gaps, and a road map for conservation
  17. Decadal biomass and area changes in a multi-species meadow in Singapore: application of multi-resolution satellite imagery
  18. A proposed decision support tool for prioritising conservation planning of Southeast Asian seagrass meadows: combined approaches based on ecosystem services and vulnerability analyses
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