Analysis of QTLs for panicle exsertion and its relationship with yield and yield-related traits in rice (Oryza sativa L.).
Analysis of QTLs for panicle exsertion and its relationship with yield and yield-related traits in rice (Oryza sativa L.).
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DOI：
10.4238/gmr.15027423
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发表时间：
2016-04
期刊：
影响因子：
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通讯作者：
C. F. Zhao;T. Chen;Q. Zhao;L. Zhou;L. Zhao;Y. Zhang;Z. Zhu;S. Yao;C. L. Wang
中科院分区：
文献类型：
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作者：
C. F. Zhao;T. Chen;Q. Zhao;L. Zhou;L. Zhao;Y. Zhang;Z. Zhu;S. Yao;C. L. Wang
穗伸出度是一个重要的形态性状，与小穗育性和产量密切相关。为了了解PE的遗传基础及其与产量和产量相关性状的关系，两年多来研究了由籼稻品种Kasalath和粳稻种质TD 70杂交获得的240个自交系组成的重组自交系群体。PE与株高、抽穗期、穗长、一次分支数、每穗颖花数、颖花密度等穗部性状呈极显著正相关，与产量构成因素相关性较差。利用141个SSR标记对12个性状进行了连锁分析，共定位到38个数量性状基因座（QTL），贡献率为6.51%~ 8.61%。其中，在第1、2、3和6染色体上鉴定出4个QTL簇，表明存在多效等位基因。在某些区间内，两个PE位点与多个性状共定位，这与表型变异的相关性一致。这些含有Kasalath等位基因且不具有多效性的PE QTL对TD 70及其它水稻品种的PE改良具有重要的参考价值。
Panicle exsertion (PE) is an important morphological trait that is closely associated with spikelet fertility and grain yield. To understand the genetic basis of PE and its relationships with yield and yield-related traits, a recombinant inbred population consisting of 240 lines derived from a cross between an Indica cultivar 'Kasalath' and a Japonica germplasm 'TD70', was studied over two years. PE was significantly correlated with plant height, heading date (HD), panicle length (PL), and panicle characteristics such as primary branch number, spikelet number per panicle, and spikelet density, but showed poor correlation with yield components. Based on linkage mapping of 141 SSR markers, a total of 38 quantitative trait loci (QTLs) were located for 12 investigated traits, with the contribution varying from 6.51 to 8.61%. Among these, four QTL clusters were identified on chromosomes 1, 2, 3, and 6, suggesting the existence of pleiotropic alleles. In some intervals, two loci for PE were collocated with several traits, which is consistent with the correlations observed with phenotypic variations. The PE QTLs with 'Kasalath' alleles and without pleiotropic effects would be valuable for the improvement of PE in 'TD70' and in other rice varieties.