Primary analysis of QTG contribution to heterosis in upland cotton

文献类型： 外文期刊

第一作者： ZHANG XianLiang

作者： ZHANG XianLiang;LIU Fang;WANG Wei;LI ShaoHui;WANG ChunYing;ZHANG XiangDi;WANG YuHong;WANG KunBo

作者机构：

关键词： upland cotton;recombinant inbred line;quantitative trait gene;heterosis;additive epistasis

期刊名称：CHINESE SCIENCE BULLETIN （ 影响因子：1.649； 五年影响因子：1.738 ）

ISSN： 1001-6538

年卷期： 2010 年 55 卷 26 期

页码：

收录情况： SCI

摘要： In this paper, we analyzed the contribution of pure DNA factors to heterosis using quantitative trait genes (QTG) in two randomly selected strains from a recombinant inbred line of Gossypium hirsutum. According to a set of QTL mapping results, combined with analysis of DNA recombinant fragment sources in the two strains and QTL association analysis with their field traits, we hypothesize a view of "dominance + overdominance + epistasis". That is, additive and additive epistasis may be the genetic basis of heterosis, and dominance, overdominance and epistasis may be the modes of heterosis action. Based on the heterosis results of this study, we also suggest a molecular mechanism for heterosis, and explain, in detail, with two randomly selected strains as examples. The male and female parent-derived additive epistatic QTLs of upper half mean length in LG01 and LG03 produced a trait variance of 2.99-3.52 compared with the female parent-derived loci. The trait of bolls per plant was controlled by two pairs of additive epistatic QTLs in LG02 and LG07, which were derived from both female and male parents. The QTLs were reciprocally interacted and produced a trait variance of 0.86. An initial concept of "super-hybrid cotton" was raised according to the nature of additive effect, that is genetic stability.

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