Abstract:

Two different drought resistant varieties have been treated by PEG-6000 grades(T0,T1,T2,T3) in rice seedling. Their morphology and physiological indices are surveyed and concluded as followed: The morphology indices of 2 varieties are restrained by strictness drought(T3 treatment) and the sensitive one is more effective than the resistant one. The morphology indices augment with treatment time prolonging by all PEG-6000 grades and their difference appear after 3-4 days. CAT and SOD activity augment with treatment time prolonging and PEG-6000 concentration increasing. The resistant one augments faster than the sensitive one and descends slower than the sensitive variety. MDA and Pro content augment with treatment time prolonging and PEG-6000 concentration increasing. The effect of the sensitive variety is stronger than the resistant one. So they are not adapted to be drought resistant indices. Root activity augments with treatment time prolonging. The consistent with or coincide with or et al optimum treatment is T1. Correlation analysis showed that there were very significantly positive correlations between root activity and morphology indices, and significantly or very significantly negative correlations between root diameter, CAT activity, SOD activity and MDA content, praline content. MDA content was very significantly positively related to praline content, CAT activity was very significantly positive correlation to SOD activity.