Breeding,Fertility and Characteristics of Thermosensitive Genic Male Sterile Line Wan2311S in Indicia Rice

[Objective] The aim was to introduce the breeding process,fertility performance and agronomic characters of thermosensitive genic male sterile line Wan2311S.[Method] With thermosensitive genic male sterile line 2301S in indicia rice as female parent,it was hybridized with 3401,the thermosensitive genic male sterile line Wan2311S in indicia rice was bred through selection for 8 generations in 5 years.[Result] From August 3 to September 21 in 2009,Wan2311S showed male sterility,its pollen abortive rate in microscopic examination was 99.93%-100.00%,its bagged seed setting rate was 0.00% and its steady sterile period was 50 d.From July 21 to September 6 in 2010,Wan2311S showed male sterility,its pollen abortive rate in microscopic examination was 99.82%-100.00%,its bagged seed setting rate was 0.00% and its steady sterile period was 48 d;from September 8 to 10 in 2010,Wan2311S showed male fertility,its pollen abortive rate in microscopic examination was 97.11%-99.93% and its bagged seed setting rate was 0.24%-1.08%;from September 13 to 21 in 2010,it showed male sterility,its pollen abortive rate in microscopic examination was 99.73%-100.00%,and its bagged seed setting rate was 0.00%.From July 8 to September 21 in 2011,Wan2311S showed male sterility,its pollen abortive rate in microscopic examination was 99.55%-100.00%,its bagged seed setting rate was 0.00%-0.13%.Under long photo period,the critical temperature for inducing male sterility was lower than 23 ℃.[Conclusion] The steady sterile period of this sterile line was longer than 30 d and the rice quality was high,so it was suitable for matching middle indicia rice combination with good quality.