Photo-thermal Characteristics of Fertility Alteration of the Dual-purpose Genic Male Sterile Line go543S in Rice

The photo-thermo sensitivity and sensitive stages of fertility alteration of go543S,a new inverse temperature-sensitive genic male sterile rice with fertility alteration of low temperature inducing sterility and high temperature inducing fertility were systematically studied.The results showed that the photoperiodic response of go543S was weak and classified as the second photoperiodic sensitivity level while its temperature response was medium and classified as the third temperature sensitivity level.The tendency of fertility alteration of go543S in Changsha district in 2002 and the photo-thermal experiment in the phytotron showed that fertility alteration of go543S was mainly controlled by temperature and was not correlated to the light length.The critical temperature of fertility alteration of go543S was about 29.5℃ with its thermo-sensitive period of fertility alteration from the stamen and pistil formation stage to pollen mother cell(PMC) meiotic division stage and the most sensitive period at PMC formation stage.