Effect of salinity on osmotic adjustment characteristics of <Emphasis Type="Italic">Kandelia candel</Emphasis> |
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Authors: | Z Zhu Z M Pei H L Zheng |
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Institution: | (1) State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujian, China |
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Abstract: | To elucidate the osmotic adjustment characteristics of mangrove plants, inorganic ion and organic solute contents of intermediate
leaves were investigated in 3-month-old Kandelia candel (L.) Druce seedlings during 45 days of NaCl treatments (0, 200, and 500 mM NaCl). The contents of Na+, Cl−, total free amino acids, proline, total soluble sugars, pinitol and mannitol increased to different degree by salinity, whereas,
K+ content decreased by salinity compared with control. NaCl treatment induced an increase of inorganic ion contribution while
a decrease of organic solute contribution. It was concluded that accumulating a large amount of inorganic ions was used as
the main osmotic adjustment mechanism under salinity treatment. However, accumulation of organic osmolytes might be considered
to play much more important role in osmoregulation under severe salinity (500 mM NaCl) than under moderate salinity (200 mM
NaCl), thus the damage caused by high toxic ions (Na+ and Cl−) concentration in K. candel leaves could be avoided. |
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