Breeding of Fine Grain Quality CMS Line Xingcheng A in Rice

Xingcheng A,developed by crossing a single plant of(Zhenshan 97B/Jin23B∥Feigai B/V20B) F4 to Zao cy-5,an early indica variety with fine grain quality,then the elite plants of their F3 generation selected to testcross with Jin 23A,a widely-used WA-type CMS line,and the single plants in their filial male sterile lines chosen to backcross continuously with their corresponding paternal plants,is a new CMS line with fine grain quality in rice.It was certified by Hunan Provincial Crop Variety Appraisal Committee in February,2007.Xingcheng A shows uniformity in agronomic characters,good plant type,complete and stable male sterility,good flowering habits and a high outcrossing rate,good restorability,strong heterosis in grain yield,fine grain quality,and relatively high disease and stress resistances.It is favorable to be used as a parent to make heterotic hybrids with good grain quality in hybrid rice breeding programs.