Physiological Adaptability of Kandelia candel Seedlings to Salt-water Stress
In the study, the influences of two hydrological factors( salinity and waterlogging time) on the physiological characters of Kandelia candel in the leaf were studied using the automatic tidal-simulation device in a greenhouse. The contents of physiological characters including superoxide dismutase( SOD), peroxidase( POD),catalase(CAT), MDA, membrane permeability, free proline content and soluble protein content were determined in the salinity and waterlogging treatments. The results showed that salinity-waterlogging had an significant effect on the physiological characters of K. candel in the leaf( p 0.05). The activities of SOD, MDA content and free proline content initially increased but then decreased with the increase of salinity. POD and CAT kept reducing as salinity increased. Membrane permeability and soluble protein content increased as salinity increased SOD activity,free proline content and soluble protein content in shorter waterlogging environment( inundated for about 2-4 h)were higher than that in longer environment( inundated for about 6-8 h). The influential effect of salinity was stronger than that of waterlogging. Salinity-waterlogging treatment resulted in more serious harm to K. candel seedlings than each stress along.