Abstract
235 seedlings of Avicennia marina were grown for 12 months in nutrient solutions containing 0, 25, 50, 75, 100, 125 and 150% artificial seawater. The salt concentration in the various organs and salt excretion from the leaves were measured to examine the salt regulation in the seedlings. The water potential of various organs in relation to external media was measured concurrently with salt concentration in the seedlings to discuss the water potential adjustment. A. marina was found to absorb a great amount of sodium (Na+) and chloride (Cl-). The salt uptake increased with the increase of external salinity and reached to the ceiling level at around the normal external seawater. The salt concentrations in the seedlings were maintained at levels higher than those of external media. This contributed to produce water potential in the seedlings lower than that of external media. The salt excretion was found to be related positively with the salt concentration in leaves. It was concluded that A. marina seedlings equipped a workable mechanism of salinity regulation through absorption and excretion. And therefore it can survive in the high salinity environment.
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