摘要
选择具有广泛代表性的6个不育系和9个恢复系,采用NCⅡ交配设计分析12个农艺性状的配合力.结果表明:①除主茎剑叶长、结实率和千粒重三性状非加性效应不明显外,其他性状的加性效应和非加性效应均有显著作用,且均以加性变异为主,但单株产量、相对日产量及单株穗数三性状非加性变异较大.②主茎剑叶长、穗长和千粒重三性状受不育系的影响稍大,其他性状均受恢复系的影响更大,但不育系对相对日产量、单株产量和每穗总粒数等性状也有相当大的作用.③参试的不育系以金23A、V20A和优ⅠA较好,恢复系以207和644最好,明恢63在配制生育期较长的杂交中稻高产组合中是一个很好的亲本.④亲本一般配合力与特殊配合力在各性状上均是相互独立的;一般配合力与亲本自身的表型值则有一定程度的正相关,说明在育种中必须注意亲本自身性状的改良.
15 widespread elite indica parents, including 6 CMS lines and 9 restorers, were chosen, and a 6×9 NC Ⅱ mating design was completed. The combining ability of 12 agronomic characters was determined. The results showed that;①Both additive and nonadditive effects were significant in all 12 characters except flag leaf length of main culm(FLLMC), seed setting rate (SSR) and 1000-grain weight(TGW) in which the nonadditive effects were insignificant; the additive variation was principal in all characters, but the nonadditive variation was also considerable in grain weight /plant (GWP) , relatively daily grain yield (RDGY) and panicles/plant (PP). ②Except FLLMC, panicle length (PL) and TGW, all characters were influenced more greatly by restorer line than by CMS line, but there was a relatively great effect of CMS line on RDGY, GWP and spikelets/panicle(SP). ③Based on the gca effects and sca variances of the parents, CMS lines Jing 23A, V20A and You I A and restorers 207 and 644 were recommendable, and Minghui 63 was a very good restorer line in developing hybrid rice with late maturity.④The gca and sca effects were independent each other, which suggests that it is essential to make widely testcrosses in the selection of hybrid combinations; There existed a positive correlation between gca and phenotypic value of parents, which indicates that great attention must be paid to the improvement of parent own characters in hybrid rice breeding.
出处
《作物学报》
CAS
CSCD
北大核心
1999年第5期622-631,共10页
Acta Agronomica Sinica
基金
国家"九五"攻关重点项目杂交水稻育种材料
方法研究课题(96-002-02-02)资助.
关键词
杂交水稻
籼型
三系法
农艺性状
配合力
水稻
Hybrid rice
Indica
Three-line system
Agronomic characters
Combining ability
Heterosis
