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首页> 外文期刊>Theoretical and Applied Genetics: International Journal of Breeding Research and Cell Genetics >Dissection of the genetic basis of heterosis in an elite maize hybrid by QTL mapping in an immortalized F population
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Dissection of the genetic basis of heterosis in an elite maize hybrid by QTL mapping in an immortalized F population

机译：永生F群体中QTL定位分析玉米杂交种杂种优势的遗传基础

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摘要

The genetic basis of heterosis for grain yield and its components was investigated at the single- and two-locus levels using molecular markers with an immortalized F2 (IF2) population, which was developed by pair crosses among recombinant inbred lines (RILs) derived from the elite maize hybrid Yuyu22. Mid-parent heterosis of each cross in the IF2 population was used to map heterotic quantitative trait loci. A total of 13 heterotic loci (HL) were detected. These included three HL for grain yield, seven for ear length, one for ear row number and two for 100-kernel weight. A total of 143 digenic interactions contributing to mid-parent heterosis were detected at the two-locus level involving all three types of interactions (additive x additive=AA, additive x dominance=AD or DA, dominance x dominance=DD). There were 25 digenic interactions for grain yield, 36 for ear length, 31 for ear row number and 51 for 100-kernel weight. Altogether, dominance effects of HL at the single-locus level as well as AA interactions played an important role in the genetic basis of heterosis for grain yield and its components in Yuyu22.
机译：利用永生化的F 2 （IF 2 ）群体的分子标记，研究了单座位和两座位水平上杂种优势的遗传基础。它是由来自优良玉米杂交种Yuyu22的重组自交系（RIL）之间的成对杂交而开发的。 IF 2 群体中每个杂交的中父母亲杂种优势用于绘制杂种数量性状基因座。总共检测到13个杂种位点（HL）。其中包括三个HL的谷物产量，七个HL的穗长，一个HL的行数和两个HL的百粒重。在两基因座水平上共检测到143个双亲基因，这些基因参与了中父母亲杂种优势，涉及所有三种类型的相互作用（加性x加性= AA ，加性x优势= AD 或 DA ，优势x dominance = DD ）。谷物产量有25种双基因相互作用，穗长有36种，穗排数有31种，而100粒重有51种。总的来说，在单基因座水平上HL的优势作用以及 AA 相互作用在Yuyu22籽粒产量及其组成成分杂种优势的遗传基础中发挥了重要作用。

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