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Physiological responses of Enhalus acoroides to osmotic stress

Physiological responses of Enhalus acoroides to osmotic stress AbstractThis 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Botanica Marina de Gruyter

Physiological responses of Enhalus acoroides to osmotic stress

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Publisher
de Gruyter
Copyright
©2018 Walter de Gruyter GmbH, Berlin/Boston
ISSN
1437-4323
eISSN
1437-4323
DOI
10.1515/bot-2017-0108
Publisher site
See Article on Publisher Site

Abstract

AbstractThis 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.

Journal

Botanica Marina – de Gruyter

Published: Jun 27, 2018

References

  • Effects of high salinity from desalination brine on growth, photosynthesis, water relations and osmolyte concentrations of seagrass Posidonia australis
  • Phylogenetic studies in Alismatidae, II: evolution of marine angiosperms (seagrasses) and hydrophily
  • Comparative ecophysiology of Baltic and Atlantic Fucus vesiculosus
  • Effects of salinity and possible interactions with temperature and pH on growth and photosynthesis of Halophila johnsonii Eiseman
  • Osmotic acclimation and turgor pressure regulation in algae
  • Ecophysiological plasticity of shallow and deep populations of the Mediterranean seagrasses Posidonia oceanica and Cymodocea nodosa in response to hypersaline stress
  • Economic and subsistence values of the standing stocks of seagrass fisheries: potential benefits of no-fishing marine protected area management