光温敏两系不育系'稆S'的选育与应用OACSTPCD

[Purpose]The yield and quality of hybrid offspring can be effectively improved by breeding with superior photo-thermo sensitive two-line sterile line.[Method]The photo-thermo sensitive two-line sterile line'RGD-7S'was crossed with the three-line maintenance line'Zhongzhe B'.After 5 years and 9 generations of genealogical selection,a photo-thermo sensitive two-line sterile line'Lü S'was developed.This line showed stable sterility,excellent rice quality,good outcrossing characteristics,as well as de-sirable plant and leaf traits.And its main characteristics and heterosis were analyzed.[Result]'Lü S'exhibited stable sterility,with a critical fertility transition temperature of<23℃and a stable sterility period of approximately 127 days.The sterile line showed a high seed production yield and good outcrossing characteristics.The stigma exposure rate was 78.62%,and the bilateral exposure rate was 39.74%.The high-yielding and high-quality two-line hybrid rice combination'Lü Liangyou Zhimei'with'Lü S'has been successively approved by the Fujian Province and Hainan Province.[Conclusion]The photo-thermo sensitive two-line sterile line'Lü S'shows stable sterility,a low fertility transition critical temperature,good rice quality,strong combining ability,and promising application prospects.