类回交育种的思考及拓展

The Reflection and Extension of Backcross-like Breeding

明晰了类回交育种提出的思路,揭示其本质并重新定义了‘类回交育种方法’。类回交育种在具体方法和育种领域上可进一步拓展,具体方法包括:多轮类回交;以单交F1表现优异的组合开展类回交;双亲遗传距离较远的组合开展类回交;单交后代不选目标性状,类回交后代筛选目标性状的类回交。领域可拓展到杂交稻育种,分别阐述了类回交选育恢复系、三系保持系、两系不育系的程序,分析了类回交育种的重要性,类回交在杂交稻上利用较常规稻上应更具成效。

Backcross-like （ BCL ） pattern was reflected, the thinking of backcross-like breeding was made clearly. The nature was disclosed and the conception was redefined. Backcross-like breeding could be extended in meth- ods and breeding fields. In methods, the breeding could be extended as 4 methods such as multiple-round back- cross-like breeding, backcross-like breeding based on F1 with good perforn＇~nce, backcross-like breeding from 2 parents with long genetic distance, and selection of target trait in progeny fl^3m backcross-like cross combination. In breeding field, the breeding could be extended to hybrid rice breeding. ＇Fhe processes to develop restorer line, maintainer line and sterile line （ S line ） were elaborated in detail. The impo^ance of backcross-like breeding was analyzed, its application in hybrid rice breeding should be more efficient thari in inbred rice breeding.