Abstract: After generating the binary system of nuclear heterogeneity by using sterile cytoplasm of WA-type and G-type Indica rice varieties and transfer of G46B, we studied the physiological and biochemical responses under drought stress simulated by PEG6000 treatment. The results showed that the responses of the cytoplasm of the two rice varieties to drought stress differed significantly. The integrated index of G-type cytoplasm was better than that of WA-type's under moderate drought stress. Meanwhile, the effects of cytoplasm on nuclear genes were also significantly different and the proportion of Cha in chlorophyll was significantly increased in G\|type cytoplasm．

Key words: hybrid rice, cytoplasm, drought, physiology and biochemistry