Changes in the physiological and biochemical characteristics of the leaves of Kandelia candel (L.) Druce seedlings in response to short-term (7 days) and long-term (60 days) treatments with two NaCl concentrations (250 and 500 mM) were studied. The growth rates were measured in terms of plant height, leaf area, and dry weight and were greater in the culture treated with 250 mM NaCl. Photosynthetic pigments also showed a preference for salinity growth conditions. The content of soluble sugars increased under any salinity during continuous treatments, whereas the proline level increased by the end of long-term culture. Further, during the treatment with 500 mM NaCl, the contents of hydrogen peroxide increased dramatically, whereas the levels of MDA, a measure of lipid peroxidation, decreased. The intactness of membrane integrity under this salinity condition may be explained by the activities of superoxide dismutase (SOD) and peroxidase (POD) which increased during the long-term experiment. It is concluded that the ability of K. candel to tolerate salt may occur mainly by inducing biosynthesis of soluble sugars and proline and increasing the activities of SOD and POD. The results imply that K. candel can survive well at 250 mM NaCl conditions and become acclimated to seawater salinity (∼500 mM) for 60 days of exposure.
Russian Journal of Plant Physiology – Springer Journals
Published: May 10, 2009
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