Accumulation of inorganic and organic osmolytes and their role in osmotic adjustment in NaCl-stressed vetiver grass seedlings |
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Authors: | Q Zhou B J Yu |
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Institution: | (1) Environmental Geochemistry Laboratory, University of Texas at San Antonio, San Antonio, TX, USA;(2) Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ, USA;(3) Biological Sciences, Michigan Technological University, Houghton, MI, USA |
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Abstract: | The accumulation of inorganic and organic osmolytes and their role in osmotic adjustment were investigated in roots and leaves
of vetiver grass (Vetiveria zizanioides) seedlings stressed with 100, 200, and 300 mM NaCl for 9 days. The results showed that, although the contents of inorganic
(K+, Na+, Ca2+, Mg2+, Cl−, NO3−, SO42− and H2PO3−)) and organic (soluble sugar, organic acids, and free amino acids) osmolytes all increased with NaCl concentration, the contribution
of inorganic ions (mainly Na+, K+, and Cl−) to osmotic adjustment was higher (71.50–80.56% of total) than that of organic solutes (19.43–28.50%). The contribution of
inorganic ions increased and that of organic solutes decreased in roots with the enhanced NaCl concentration, whereas the
case in leaves was opposite. On the other hand, the osmotic adjustment was only effective for vetiver grass seedlings under
moderate saline stress (less than 200 mM NaCl). |
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