Breeding and Utilization of New Restorer Line Yihui 3551 in Rice

The new restorer line Yihui 3551 was developed by crossing the female parent CDR22/81136 (Sujing 4/Roma∥IR661) to the male parent indica restorer line Minghui 78. It has good plant type, wide restoring spectrum and strong restoring ability, good combining ability, good flowering habit, high yield of seed production. The yield of Gangyou 3551 was the highest (8.63 and 8.75 t/hm2, which were 8.36% and 8.72% higher than that of the check Shanyou 63 in 1999 and 2000, respectively.) in the provincial regional trials in Sichuan. And its yield was also the highest (8.63 t/hm2, 5% higher than Shanyou 63) in the regional trial of South China in 2000. Gangyou 3551 is the first hybrid whose yield was over 8% higher than that of Shanyou 63 in the provincial regional trials in Sichuan for two consecutive years. It was registered and released in Sichuan in 2001.