“江农早4号A”的选育及不育系选育标准和途径的探讨

摘要

The sterile line “Jiangnongzao No.4 A” was bred through eight years' study, its maintainer line came from the sibling line of “Jiangnongzao No.2 B”. “Jiangnongzao No.4 A” possesses apparently improved plant types and spike characters, stable sterility, strong combining ability, good flowering habit and high outcrossing setting rate. The combinations from “Jiangnongzao No.4 A” have good plant types, strong resistance and better rice quality. The key factors of sterile line breeding were analyzed, the standard and approach of sterile line breeding were put forward and discussed respectively in this paper.%野败同型不育系“江农早4号A”，其保持系来源于“江农早2号B”的姐妹系，经过8年的选育，其株型与穗部性状得到明显改进，不育性稳定，配合力强，开花习性好，异交结实率高。用它配制的组合株型优良，抗性好，米质较优。分析了选育不育系的关键因素，提出了不育系选育标准并讨论了选育途径。