Abstract: W₆₁₅₄,S, Annong S-1 and Hengnong S-1 were selected as tested materials and method of seeding by stages was taken to study. Aseries of concepts of "critical low temperature", "critical high temperature" and "transitional temperature" were put forward in this paper. The CLTand CHTfor W₆₁₅₄Sand Annong S-1 were 23℃ and 25℃, and 23.5℃, and 27℃ for Hengnong S-1. It was considered that 1) the response of different PGMRs to temperature and light varies; 2) perhaps it is more suitable to use the name of "ecological factor——sensitive genie male-sterile rice" instead of "PGMR"; 3) the PGMRcould be employed in production.

Key words: PGMR, Temperature, Phctoperiod, Fertility change