Abstract: In this experiment, 90336S, with low sterility inducing temperature (SIT), 90332S and Annong S-1, with medium SIT, 90341S, with high SIT were selected as parents for researching the genetics of variation of fertility expression of TGMS gene in different genetic backgrounds. The fertility expression of F₂s and B₁s was observed under natural conditions. It was found that the SIT difference between 90336S and 90332S is controlled by two independent dominant genes (L1,L2) and the SIT difference between Annong S-1 and 90341S is controlled by a incomplete dominant gene H. L1,L2 can decrease SIT, but H increase it.

Key words: fertility expression, gene, male sterile, thermo-sensitive genic sterile rice

摘要： 采用低温敏核不育系90336S、中温敏核不育系90341S和安农S-1，高温敏核不育系90341S作材料，在自然变温条件下，观察F₂代、回交一代的育性表现，发现90336S和90332S的不育起点温度差异由相互独立的两个显性基因（L1,L2）控制，L1,L2 有降低不育起点温度的作用；安农S-1和90341S的不育起点温度差异是由单个不完全显性基因H造成的，H有提高不育起点温度的作用。

关键词: 雄性核不育, 育性表现, 基因, 温敏核不育水稻