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对引进的16份美国玉米种质扩增计划(GEM)玉米材料和5份自育自交系采用NC-II设计,配制80个组合进行配合力分析,划分杂种优势群,评价其利用潜力。结果表明,两组亲本8个性状的一般配合力方差大多数达到显著或极显著水平;两组亲本组配的杂交组合的特殊配合力方差,除秃尖长不显著外,其余均达到极显著水平,其中,GH358各性状综合GCA效应值最高,GR9、GR15和GH291、GH302综合GCA效应值较高;组合GH281×GR15的产量SCA效应值和总配合力TCA均最高。聚类分析结果,16份供试美国GEM玉米材料被划分为两大杂种优势群,进而划分为5个亚群。GH358是最为理想的亲本材料,GR9、GR15和GH291、GH302是具有利用价值的玉米材料,用它们作亲本组配出高产组合的机率较大。GH281×GR15是本研究筛选出的强优势组合;GH230×GR2、GH358×GR22和GH266×GR9可以作为优势组合进一步筛选鉴定;GH219×GR10、GH266×GR2、GH283×GR10产量配合力表现较好,应着重进行改良和利用。
A total of 16 introduced maize germplasm expansion programs (GEM) and 5 self-bred inbred lines were designed by using NC-II. Eighty combinations were prepared for combining ability analysis, and the heterosis groups were divided to evaluate their potential utilization. The results showed that the variance of the general combining ability of the 8 traits of the two parents reached significant or extremely significant level. The special combining ability variance of the crosses of the two parents had no significant difference The highest comprehensive GCA effect was observed in all the traits of GH358, and the highest comprehensive GCA effect was observed in GR9, GR15 and GH291 and GH302. The highest SCA effect and total combining ability (TCA) of the combination GH281 × GR15 were obtained. Cluster analysis results, 16 copies of the test US GEM corn material is divided into two major heterotic groups, and then divided into five subgroups. GH358 is the most ideal parent material. GR9, GR15 and GH291 and GH302 are valuable maize materials, and they are more likely to be used as parents to produce high-yielding combinations. GH2 × GR2, GH358 × GR22 and GH266 × GR9 could be further screened and identified as GH281 × GR15; GH219 × GR10, GH266 × GR2 and GH283 × GR10 had better combining ability, Should focus on the improvement and utilization.