Zhou Hao, Xia Duo, Zeng Jing, Jiang Gonghao, He Yuqing
National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China.
Rice (N Y). 2017 Aug 29;10(1):39. doi: 10.1186/s12284-017-0179-9.
Combining ability is a measure for selecting elite parents that make the highest contributions to hybrid performance. However, the genetic bases of combining ability and how they contributed to heterosis is seldomly known.
We constructed a both NCII and NCIII population derived from an indica-japonica cross to study the relationship among parental performance, combining ability and hybrid performance of 11 agronomic traits. Among them, specific combining ability is more important to grain yield than parental performance and general combining ability. We performed linkage analyses to phenotypic values and combining ability of all 11 traits in Doubled haploid lines and its two backcross populations and identified 108 QTLs in total. Among these QTLs, four known loci, Sd1, Ghd7, Ghd8 and DEP1 contribute a lot to GCA effects of agronomic traits except grain yield and seed setting rate. Three QTLs, Ghd8, S5 and qS12, contribute a lot to SCA effects of grain yield and present overdominace.
Our study provides insights into the genetic bases of combining ability and heterosis and will promote the improvements of indica-japonica hybrid breeding.
配合力是选择对杂种表现贡献最大的优良亲本的一种度量。然而，配合力的遗传基础以及它们如何导致杂种优势却鲜为人知。
我们构建了一个由籼粳杂交衍生的NCII和NCIII群体，以研究11个农艺性状的亲本表现、配合力和杂种表现之间的关系。其中，特殊配合力对产量的重要性高于亲本表现和一般配合力。我们对双单倍体系及其两个回交群体中所有11个性状的表型值和配合力进行了连锁分析，共鉴定出108个QTL。在这些QTL中，四个已知位点Sd1、Ghd7、Ghd8和DEP1对除产量和结实率外的农艺性状的GCA效应有很大贡献。三个QTL，Ghd8、S5和qS12，对产量的SCA效应有很大贡献，并表现出超显性。
我们的研究为配合力和杂种优势的遗传基础提供了见解，并将促进籼粳杂交育种的改进。
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