Tianlong 1A,derived from the cross of Basmati,an introduced fine quality rice,and H067,an indica-japonica derivative with maintaining ability,and the testcross of single plants selected from its F3 population to Feigai A,is a new CMS line developed by Mianyang Tianlong Rice Research Institute through the successive backcrossing method.It has compact plant type,strong tillering ability,stable male sterility,high outcrossing rate and good grain quality.Its hybrids show a strong heterosis in grain yield and a relatively early maturity.In August,2004,it was technically identified in Sichuan Province.The hybrid Tianlongyou 140 (Tianlong 1A/Tianlonghui 140),a double-cropping late rice hybrid variety,was certified and released to commercial production in Hunan Province in 2009.

Exploring novel source of cytoplasmic male sterile (CMS) is essential to stabilize the productivity of hybrid rice. By respectively researching anther defective sterile line M01, M02, M03 with wild, indica and japonica rice cytoplasm, the following results are found: 1.Anther defective male sterility can result from the interaction between the nuclear and the cytoplasm; 2.Anther defective male sterility can be hereditable steadily; 3.While anther retrogrades solely, its female does so, resulting in female sterile; 4.Restore line defective of anther is different from others'.

Ⅱ优５０１是绵阳市农科所、绵阳农专校用Ⅱ－３２－８Ａ与绵恢５０１组配的优质高产杂交稻组合。１９９３年通过四川省农作物品种审定委员会审定，１９９８年２月通过湖北省农作物品种审定委员会审定［１］。我们从１９９０年起开始研究其高产制种技术，并对Ⅱ－３２Ａ进...