Abstract
Salt induced biochemical changes were studied in hydroponically grown plants of a salt secrector mangrove, Aegiceras corniculatum (Myrsinaceae). Total Chl content decreased in 250 mM NaCl over the 30 d treatment period. The Chl a:b ratio remained unchanged in leaves, but carotenoids showed a 1.6-fold decrease. Total sugar content decreased to half in 250 mM NaCl and starch content increased by 174%. Leaf protein content decreased slightly and SDS-PAGE analysis showed nearly identical protein profiles in control and salt treated samples, which suggests that NaCl did not alter protein synthesis or proteolytic activity. The total free amino acid pool as well as the proline content decreased by 24 and 75% respectively in the leaves of 250 mM NaCl treated plants. The accumulation of polyphenols suggests a role as protective metabolites. The results show that the salt secreting mangrove A. corniculatum can be sustained and propagated under low salinity conditions. At high levels of salinity (∼250 mM) the plants become acclimated to salt in 1–2 weeks.
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