【摘要】 研究杂交组合的遗传特性,挖掘优异的种质资源对于杂种优势利用具有重要意义。本试验以8个恢复系为父本、21个不育系为母本,按照不完全双列杂交8×21(NCII)设计配制168个组合,对8个农艺性状的配合力及遗传参数进行分析。结果表明:有效穗数、穗长、千粒重主要受基因加性效应影响,株高、实粒数、结实率主要受基因非加性效应互作影响;杂交组合的株高、有效穗数、穗长、千粒重、单株产量的表现主要依赖于母本,总粒数受父本影响更大,实粒数、结实率取决于双亲的表现;有效穗数、单株产量在后代遗传中的稳定性较差,易受环境和基因非加性效应影响;843A、宜香1A、沪旱7A、昌恢871、昌恢T025、雅占为配合力好的亲本,宜香1A、昌恢T025具有最好的一般配合力(GCA)效应值;宜香1A/昌香恢1号、千乡059A/昌恢121、广8A/昌恢881为较优组合,宜香1A/昌香恢1号特殊配合力(SCA)最优。对恢复系主要农艺性状进行配合力分析,为杂交水稻恢复系的选育提供了一定的科学依据。更多还原

【Abstract】 In order to make use of the heterosis in hybridization breeding,it is of great significance to explore excellent germplasm resources and analyze the combining ability. By deployment of 8 restorer lines and 21 sterile lines,which served as male and female parent,respectively,this study generated 168 hybrids following the incomplete diallel hybridization 8×21(NCII). These materials were analyzed for the combining ability and the genetic parameters of 8 agronomic traits. The results showed that the effective panicle number,panicle length and 1000-grain weight were mainly affected by the additive effect,and the plant height,filled grain number and the seed setting rate were mainly affected by the interaction of non-additive effect. The plant height,effective panicle number,spike length,1000-grain weight and yield per plant of hybrid combination were largely femaledependent,while the total grain number was largely male-dependent. The grain number and seed setting rate were genetically contributed by both parents. The effective panicle number and yield per plant were depending on the interaction between genetic components and environment conditions. The parents with combining ability were 843 A,Yixiang 1 A,Huhan7 A,Changhui 871,Changhui T025 and Yazhan. Out of these genotypes,Yixiang 1 A and Changhui T025 exhibited the best General Combining Ability(GCA)effect value. The hybrid combination Yixiang 1 A/Changxianghui 1 exhibited the excellence on Special Combining Ability(SCA),and the hybrids including Yixiang 1 A/Changxianghui 1,Qianxiang 059 A/Changhui 121,Guang8 A/Changhui 881 were qualified. Thus,by investigating the combining ability of main agronomic characters in restorer lines,this study provided some scientific basis for the breeding of hybrid rice restorer lines.更多还原