Abstract:The commercial production of two line system hybrid rice deponds on development of a number of qualified photo- or thermo-sensitive genic male sterile ( PGMS & TGMS ) lines of rice .The most important criterion for qualified rice PGMS & TGMS lines is that the initial temperature inducing male sterility must be relatively low .The rice TGMS line 96-5-2S with double low critical temperature values ,i.e., both the initial temperature inducing male sterility and critical low temperature causing physiologi...