Abstract:

Abstract：Hevea brasiliensis seeds of RRIM600 were soaked for 7days under hypertonic solution stresses of NaCl, Mannitol, PEG6000 and the seedlings which could stand the high-osmosis stress were observed to estimate the physiological indexes related to the drought resistance. The analysis of principal components and subordinate function showed that superoxide dismutase (SOD)，catalase (CAT), soluble sugar (SS), praline (PRO), hydrogen peroxide (H2O2), Superoxide Free Radical (O2-) were the most important physiological indexes for drought resistance in rubber seedling, and that all the treatments under trial gave a drought resistance in the order of Mannitol (10%)＞PEG6000(15%)＞NaCl(3%)＞Mannitol (15%)＞PEG6000 (25%)＞Mannitol (20%)＞NaCl(2%)＞NaCl(4%)＞PEG6000 (35%)＞Mannitol (20%)。