Abstract: Abstract: [objective] The forecast of sterile alteration for temperature-sensitive genic male sterile (TGMS) line in two-line hybrid rice seed production was traditionally based on screen temperature determined by weather station. The paper put forward a new approach based on plant temperature, which showed more exact and direct than the traditional method. [Method] Simulated the self-seeded setting rate of a widely used TGMS line, Peiai64S by using several temperature parameters and duration, [Result] the result showed that, the fertility were affected directly by plant temperature at height of 20cm or the air temperature around it by duration of three days. Using the stem temperature of three days at height of 20cm as simulated parameter, the fertility of Peiai64S had the maximum, minimum and adaptive temperature as 22.8℃, 21.7℃ and 22.5℃, respectively. While, 23.2℃, 21.5℃ and 21.8℃, respectively, when using the air temperature of three days around height of 20cm as parameter. [Conclusion] Such temperature indices can be used to determine the sterile alteration of TGMS and safeguard seed production in two-line hybrid rice seed production. The paper established a model for concluding plant temperature by temperatures of inflow and outflow water, air temperature and cloud information as well determined by weather station.

Key words: Temperature-sensitive genic male sterile rice(TGMS), Sterile alteration, Plant temperature