Analysis on the Breeding and Major Traits of Wide-adaptability Indica CMS Line Yungu 3A

Breeding sterile lines is the key to the development of hybrid rice with wide adaptability. However,at present,few wide-adaptability sterile lines have been applied in production practice. In this study,Yungu 3A,a new WA-type Indica CMS line with good grain quality,was developed by hybridization between Yunfeng 66 A with wide adaptability as female parent and F1 plants of Yunfeng 66 B / D62 B as male parent and continuous backcrossing. According to the results,the finally obtained Indica CMS line Yungu 3A has good plant type and leaf shape,strong tillering ability,excellent flowering habit,stable and complete male sterility with the sterile plant rate and pollen sterility rate of 100%,strong combining ability,high outcrossing rate,low sensitivity to light and temperature,and strong disease resistance,which was approved by Yunnan Provincial Crop Variety Appraisal Committee in 2013. Yungu 3A is conducive to the development of new hybrid rice combinations with good quality and wide adaptability,exhibiting a promising prospect of application.