Effect of Genetic Backgrounds on Sterility Expression of Filial Generation Derived from a Thermo-Sensitive Genic Male Sterile Line of Non-Pollen Type XianS in Rice

XianS is a thermo-sensitive genic male sterile line of non-pollen type in rice and a mutant from a traditional variety Xianhuangzhan. The effects of genetic backgrounds on sterility expression of filial generations of XianS were studied by cross of XianS with several parental lines. The results were as follows:during the sterile period of XianS, the rate of sterile plants to fertile plants followed 1∶3 in generation F₂ and BC₁F₂ of 8 combinations. The sterility of XianS was controlled by one pair of major genes and the type of pollen abortion could be inherited. However, the time of appearance of non-pollen abortion could be affected by genetic backgrounds. Analysis of variance showed that the variance of days of sterile period and fertile period for sterile plants from F₂ of different combinations was significant,and the variance of different plants in the same combination was obvious. The relationship between days of sterile period and fertile period for sterile plants from F₂ of 8 combinations was negatively correlated,and the correlation of XianS/Jinhuazhan,XianS/Xianhuangzhan,XianS/Xinxiaozhan,XianS/Yeluzhan,XianS/Minizaozhan was significant.