PHYSIOLOGICAL-RESPONSES OF MANGROVE SEEDLING TO TRIACONTANOL

In viviparous hypocotyls of Rhizophora apiculata Blume the triacontano l treatment enhanced the growth of root and shoot (number of primary a nd secondary roots, length of roots, shoot height and biomass) protein and energy contents of leaves and roots, in vivo nitrate reductase ac tivity contents of chlorophylls and carotenoids in leaves as well as t he amount of chlorophylls present in photosystems 1 and 2 and in the l ight harvesting complex of chloroplasts. These promotory effects were recorded at 40 and 80 mg m-3 triacontanol. but they decreased with inc reasing growth regulator concentration.