【摘要】 通过5×5不完全双列杂交,对杂交水稻亲本的8个主要农艺性状配合力、遗传力及F1的优势表现进行分析,结果表明:1)所考查性状的一般配合力及特殊配合力均达到极显著水平,其中株高、穗长、单株有效穗、每穗总粒数、每穗实粒数、结实率、千粒重以加性效应为主,而单株粒重以非加性效应为主;2)杂交水稻的配组优势同时受到一般配合力和特殊配合力的影响,一般配合力与亲本自身的表现值呈极显著正相关;3)各性状的狭义遗传力由大到小的趋势是:株高、每穗总粒数、穗长、千粒重、单株有效穗、每穗实粒数、结实率、单株粒重。更多还原

【Abstract】 The combining ability and heritability of 8 major agronomic characters of 10 rice parents and their F1heterosis were determined by the NCⅡ mating design.The results showed that there was significant difference in general combining ability(GCA) and specific combining ability(SCA) of 8 agronomic characters between 10 rice parents,the heredity of plant height(PH),panicle length(PL),effective panicles/plant(EPP),total grains/panicle(TGP),filled grains/panicle(FGP),seed setting rate(SSR) and 1000-grain weight(TGW) mainly depended on additive effect and the heredity of grain weight/plant(GWP) mainly depended on non-additive effect,the heterosis of combination was affected simultaneously by general combining ability(GCA) and special combining ability(SCA),there was a significant positive correlation between parent GCA and its competitive heterosis,and the narrow heritability of 8 agronomic characters plant height>grains/panicle>panicle length>1 000-grain weight>effective panicles per plant>filled grains per panicle>seed setting rate>grain weight per plant.更多还原