Abstract: The changes in fertility and physiological activities of rice Annong S-1 and Hengnong S-1 were studied under different day length and temperature conditions. The results showed that, in long day or short day, the high temperature (31℃/28℃) induced male sterility of Annong S-1 and Hengnong S-1, the low temperature (24℃/22℃) induced them fertile. Under high temperature condition, ATP contents in their floscules and anthers were decreased obviously, the rates of respiration of the floscules and the anthers were declined gradually.

Key words: Rice, Temp-sensitive male sterity, Fertility, ATP, Rate of respiration