Abstract:Differentiation of a low thermo-sensitive genic male sterile(LTGMS)rice line go 543S to temperature and photoperiod under the conditions of natural ecology in C hangsha (altitude45m,28°12N),China and different artificial temperature and day length treatments were studied. The results were as follows: (1) go543S was sterile when the natural daily mean temperature was lower than 29.4℃ but fertil e when the temperature was higher than 30.3℃ at its thermo-sensitive stages. (2) The thermo-sensitive stages ind...