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首页> 外文期刊>Journal of genetics >Genomewide mapping reveals a combination of different genetic effects causing the genetic basis of heterosis in two elite rice hybrids
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Genomewide mapping reveals a combination of different genetic effects causing the genetic basis of heterosis in two elite rice hybrids

机译：全基因组图谱揭示了两种遗传效应的组合，这些遗传效应导致了两个优良水稻杂种的杂种优势的遗传基础

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North Carolina design III (NCIII) is one of the most powerful and widely used mating designs for understanding the genetic basis of heterosis. However, the quantitative trait mapping (QTL) conducted in previous studies with this design was mainly based on analysis of variance (ANOVA), composite interval or multiple interval mapping methods. These methodologies could not investigate all kinds of genetic effects, especially epistatic effects, simultaneously on the whole genome. In this study, with a statistical method for mapping epistatic QTL associated with heterosis using the recombinant inbred line (RIL)-based NCIII design, we conducted QTL mapping for nine agronomic traits of two elite hybrids to characterize the mode of gene action contributing to heterosis on a whole genomewide scale. In total, 23 main-effect QTL (M-QTL) and 23 digenic interactions in IJ (indica x japonica) hybrids, 11 M-QTL and 82 digenic interactions in II (indica x indica) hybrid QTLs were identified in the present study. The variation explained by individual M-QTL or interactions ranged from 2.3 to 11.0%. The number of digenic interactions and the total variation explained by interactions of each trait were larger than those of M-QTL. The augmented genetic effect ratio of most M-QTL and digenic interactions in (L-1-L-2) data of two backcross populations (L-1 and L-2) showed complete dominance or overdominance, and in (L-1+L-2) data showed an additive effect. Our results indicated that the dominance, overdominance and epistatic effect were important in conditioning the genetic basis of heterosis of the two elite hybrids. The relative contributions of the genetic components varied with traits and the genetic basis of the two hybrids was different.
机译：北卡罗来纳州设计III（NCIII）是了解杂种优势遗传基础的功能最强大且使用最广泛的交配设计之一。但是，以前的研究使用此设计进行的数量性状映射（QTL）主要基于方差分析（ANOVA），复合区间或多区间映射方法。这些方法无法同时研究整个基因组的所有遗传效应，尤其是上位性效应。在这项研究中，使用基于重组自交系（RIL）的NCIII设计的统计学方法绘制与杂种优势相关的上位QTL，我们对两种优良杂种的9个农艺性状进行了QTL映射，以表征导致杂种优势的基因作用方式在整个基因组范围内。在本研究中，总共鉴定出23种主要效应QTL（M-QTL）和IJ（indica x japonica）杂种中的23种双基因相互作用，11种M-QTL和II（indica x indica）杂种QTL中的82种双基因相互作用。由单个M-QTL或相互作用解释的变异范围为2.3％至11.0％。双性状相互作用的数量和由每个性状的相互作用解释的总变异均大于M-QTL。两个回交群体（L-1和L-2）的（L-1-L-2）数据中大多数M-QTL和双基因相互作用的增强遗传效应比显示出完全的优势或主导地位，以及（L-1 + L-2）数据显示出加和效应。我们的结果表明，优势，主导地位和上位效应对于调节这两个优良杂种的杂种优势的遗传基础很重要。遗传成分的相对贡献随性状而变化，并且两个杂种的遗传基础也不同。

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