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首页> 美国卫生研究院文献>Scientific Reports >Genetic mapping with testcrossing associations and F2:3 populations reveals the importance of heterosis in chilling tolerance at maize seedling stage
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Genetic mapping with testcrossing associations and F2:3 populations reveals the importance of heterosis in chilling tolerance at maize seedling stage

机译：利用testcrossing关联和F2：3种群的遗传图谱揭示了杂种优势对玉米幼苗期耐冷性的重要性

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摘要

Maize seedlings are sensitive to low temperatures, and genetic mapping for chilling tolerance at the seedling stage with genetically diverse populations would facilitate the genetic improvement of this important trait. In this study, quantitative trait loci (QTL) mapping for four chilling tolerance-related traits at the seedling stage was conducted via a genome-wide association study (GWAS) with 338 testcrosses. A total of 32 significant loci and 36 stress tolerance-related candidate genes were identified, though none of them have been revealed by QTL mapping using maize inbred lines in previous reports. Moreover, expression of ten of the candidate genes was induced by chilling stress in a maize hybrid, though only a few of these genes were upregulated in its tolerant parent. These implied that heterosis might be involved in maize chilling tolerance. To further evaluate the importance of heterosis in chilling tolerance at the seedling stage, genetic mapping for chilling tolerance was conducted using an F2:3 population derived from the two inbred lines used for the gene expression assay. Of the seven QTL revealed, six loci showed partial dominance or over-dominance effects. Results from this study demonstrate that heterosis plays an important role in chilling tolerance in maize seedlings.
机译：玉米幼苗对低温敏感，遗传图谱针对具有遗传多样性种群的幼苗期的耐寒性将促进这一重要性状的遗传改良。在这项研究中，通过338个测交的全基因组关联研究（GWAS），对苗期四个耐冷性相关性状的数量性状基因座（QTL）进行了定位。总共鉴定出32个重要基因座和36个与胁迫耐受性相关的候选基因，尽管在以前的报道中没有使用玉米自交系通过QTL作图揭示它们。此外，通过低温胁迫在玉米杂种中诱导了十个候选基因的表达，尽管这些基因中只有少数在其耐性亲本中被上调。这些暗示杂种优势可能与玉米的耐冷性有关。为了进一步评估杂种优势对幼苗期耐冷性的重要性，使用源自用于基因表达测定的两个自交系的F2：3群体进行了耐冷性的遗传定位。在揭示的七个QTL中，六个基因座显示出部分优势或过度优势效应。这项研究的结果表明，杂种优势在玉米幼苗的耐冷性中起重要作用。

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