QTL Analysis on Yield and Its Components in Recombinant Inbred Lines of Upland Cotton

Q3 Agricultural and Biological Sciences Acta Agronomica Sinica Pub Date : 2011-03-01 DOI:10.1016/S1875-2780(11)60013-8

Wei ZHANG , Fang LIU , Shao-Hui LI , Wei WANG , Chun-Ying WANG , Xiang-Di ZHANG , Yu-Hong WANG , Guo-Li SONG , Kun-Bo WANG

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引用次数: 10

Abstract

To facilitate the application of simple sequence repeat (SSR) markers in molecular marker-assisted selection (MAS) of upland cotton (Gossypium hirsutum L.), a linkage map harboring 192 SSRs was constructed from the CRI-G6 population (Acala 1517 × Dezhou 047) using mixed-model-based composite interval mapping (MCIM) method. This map was used to detect quantitative trait loci (QTLs) associated with cotton yield traits in 3 environments. In the separate analysis, 24 main-effect QTLs were identified including each one stable QTL for seed yield, lint yield, lint percentage, seed index, and boll number per plant. In the joint analysis, 14 main-effect QTLs and 20 pairs of additive–additive epistatic QTLs were detected including 6 main-effect and 7 pairs of epistatic QTLs with environmental interactions. Eight main-effect QTLs were mapped in the same regions using both methods. Some main-effect QTLs with stability in different growing environments had phenotypic contributions larger than 10%, and these QTLs are candidate genes/loci in MAS of upland cotton.

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陆地棉重组自交系产量及其构成因素的QTL分析

为了促进SSR标记在陆地棉分子标记辅助选择(MAS)中的应用，采用基于混合模型的复合区间作图(MCIM)方法，以棉花CRI-G6群体Acala 1517 ×德州047为研究对象，构建了包含192个SSR标记的连锁图谱。利用该图谱检测了3种环境下与棉花产量性状相关的数量性状位点。在单独分析中，共鉴定出24个主效QTL，其中籽粒产量、皮棉产量、皮棉率、种子指数和单株铃数各1个稳定QTL。在联合分析中，共检测到14个主效应qtl和20对加性-加性上位性qtl，其中6个主效应qtl和7对具有环境互作作用的上位性qtl。使用这两种方法在同一区域定位了8个主效qtl。部分在不同生长环境下具有稳定性的主效qtl表型贡献率大于10%，这些qtl是陆地棉MAS的候选基因/位点。

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