Characteristics of superior restorer line Yanhui 888 and its two-line hybrid rice series

Growing two-line hybrid rice is a major measure to improve rice yield,and superior two-line restorer line selection is an important approach in two-line hybrid rice breeding. Yanhui 888,a two-line restorer line,four Indica photothermo-sensitive genic male sterile lines,Yan 582 S,Yan 221 S,Yan 220 S and Yan 161 S,and four combinations of Yanhui888 with male sterile lines were used to investigate restoration characteristics of Yanhui 888,the sterility of male sterile lines and yield,quality and resistance performance of hybrid rice combination. Yanhui 888 had a strong restoration power with natural seed settings of79. 30%- 84. 80% for four combinations. Four male sterile lines owned stable male sterility,with threshold temperature of fertility alteration of 23 ℃ to 24 ℃,stable sterility duration for more than 45 d,and self seed setting of 0. Four two-line combinations outyielded Ⅱ You 084 and ⅡYou838( CK) by 4. 22% and 7. 07% in regional test,and 5. 90% and 11. 30% in production test. The quality of four combinations met GB level three of high quality rice standards. Comprehensive resistance to rice blast,panical blight,bacterial blight and sheath blight was better than control. It was concluded that Yanhui 888 was a superior two-line restorer line with high combining ability,strong restoration power and wide restoring spectrum,and two-line hybrid rice combinations derive from Yanhui 888 showed strong heterosis and excellent comprehensive properties.