Genetic analysis of Upland cotton dynamic heterosis for boll number per plant at multiple developmental stages.
Genetic analysis of Upland cotton dynamic heterosis for boll number per plant at multiple developmental stages.
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陆地棉多个发育阶段单株结铃数动态杂种优势遗传分析
DOI：
10.1038/srep35515
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发表时间：
2016-10-17
影响因子：
4.6
通讯作者：
Hua J
中科院分区：
文献类型：
--
作者：
Shang L;Wang Y;Cai S;Ma L;Liu F;Chen Z;Su Y;Wang K;Hua J
产量是一个重要的育种目标。单株铃数是陆地棉重要的产量构成因素，表现出较强的动态特性和较强的杂种优势。然而，动态杂种优势背后的遗传基础却鲜为人知。本研究利用两个重组自交系和两个相应的回交群体，对不同发育阶段和不同环境下的BNP和杂种优势进行了动态数量性状座位(QTL)分析。通过单基因座分析，最终成熟期共检测到23个QTL，其余3个发育阶段共检测到99个QTL。在相邻阶段共检测到48个影响BNP的条件QTL。后期检测到的QTL主要存在于部分显性到显性范围内，前期检测到的QTL在植株发育过程中大多表现为显性到超显性范围的效应。通过双基因座分析，我们发现上位性不仅在RIL群体的表现变异中起重要作用，而且在回交群体的杂种优势表现中也起着重要作用。综上所述，本研究揭示了杂种优势的遗传基础是动态的、复杂的，它涉及环境互作的动态显性效应、上位性和QTL。
Yield is an important breeding target. As important yield components, boll number per plant (BNP) shows dynamic character and strong heterosis in Upland cotton. However, the genetic basis underlying the dynamic heterosis is poorly understood. In this study, we conducted dynamic quantitative trait loci (QTL) analysis for BNP and heterosis at multiple developmental stages and environments using two recombinant inbred lines (RILs) and two corresponding backcross populations. By the single-locus analysis, 23 QTLs were identified at final maturity, while 99 QTLs were identified across other three developmental stages. A total of 48 conditional QTLs for BNP were identified for the adjacent stages. QTLs detected at later stage mainly existed in the partial dominance to dominance range and QTLs identified at early stage mostly showed effects with the dominance to overdominance range during plant development. By two-locus analysis, we observe that epistasis played an important role not only in the variation of the performance of the RIL population but also in the expression of heterosis in backcross population. Taken together, the present study reveals that the genetic basis of heterosis is dynamic and complicated, and it is involved in dynamic dominance effect, epistasis and QTL by environmental interactions.
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部分显性、过度显性和上位性作为陆地棉杂种优势的遗传基础（Gossypium hirsutum L.）
影响因子：
3.7
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