Pengaruh Perlakuan Asam Askorbat dalam Meningkatkan Toleransi Kekeringan pada Dua Varietas Padi Gogo (Oryza sativa L.)

Abstract

The aimed of this research was to examine the effects of ascorbic acid treatment to improve drought tolerance of two varieties of upland rice growth under drought stress. The laboratory works consisted of two experiments and were designed to determine the critical osmotic potential of upland rice and to determine the optimum ascorbic acid concentration. The greenhouse study was designed to examine the effects of soaking seed in ascorbic acid on seedling growth under drought stress. Drought condition was simulated by PEG-6000 and regulation of water treatment. During the first experiment,osmotic potential was significant at all variables but varieties and interactions of both osmotic potential and varieties were no significant at all variables. Germination percentage and speed of germination were significantly decreased by increasing of osmotic potential. The second experiment showed that interactions of both factors were no significant at all variables. The result showed that the ascorbic acid treatment only improved the germination percentage and speed of germination compare the control. However, the best result was showed by 55 mM ascorbic acid. The result of green house experiment showed that the interactions were no significant except on leave wide and water deficit 1 WAP. Ascorbic acid treatment was no effect at all variables.