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首页> 外文期刊>Theoretical and Applied Genetics: International Journal of Breeding Research and Cell Genetics >Genome-wide association analysis for nine agronomic traits in maize under well-watered and water-stressed conditions.
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Genome-wide association analysis for nine agronomic traits in maize under well-watered and water-stressed conditions.

机译：水分充足和水分胁迫条件下玉米的九个农艺性状的全基因组关联分析。

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摘要

Drought can cause severe reduction in maize production, and strongly threatens crop yields. To dissect this complex trait and identify superior alleles, 350 tropical and subtropical maize inbred lines were genotyped using a 1536-SNP array developed from drought-related genes and an array of 56,110 random SNPs. The inbred lines were crossed with a common tester, CML312, and the testcrosses were phenotyped for nine traits under well-watered and water-stressed conditions in seven environments. Using genome-wide association mapping with correction for population structure, 42 associated SNPs (P<=2.25x10-6 0.1/N) were identified, located in 33 genes for 126 trait x environment x treatment combinations. Of these genes, three were co-localized to drought-related QTL regions. Gene GRMZM2G125777 was strongly associated with ear relative position, hundred kernel weight and timing of male and female flowering, and encodes NAC domain-containing protein 2, a transcription factor expressed in different tissues. These results provide some good information for understanding the genetic basis for drought tolerance and further studies on identified candidate genes should illuminate mechanisms of drought tolerance and provide tools for designing drought-tolerant maize cultivars tailored to different environmental scenarios.
机译：干旱会导致玉米减产，并严重威胁农作物产量。为了剖析这种复杂性状并鉴定优良等位基因，使用从干旱相关基因开发的1536-SNP阵列和56,110个随机SNP阵列对350个热带和亚热带玉米自交系进行了基因分型。将近交系与通用测试仪CML312杂交，并在七个环境中的水分充足和水分胁迫的条件下对9个性状进行表型鉴定。利用全基因组关联图谱对种群结构进行校正，鉴定出42个相关的SNP（P <= 2.25x10 -6 0.1 / N），位于126个性状x环境x处理组合的33个基因中。在这些基因中，有三个共定位于干旱相关的QTL区。基因GRMZM2G125777与耳朵的相对位置，百粒重和雄性和雌性开花时间密切相关，并编码含有NAC结构域的蛋白质2，该蛋白质在不同组织中表达。这些结果为理解耐旱性的遗传基础提供了一些良好的信息，对鉴定的候选基因的进一步研究应阐明耐旱性的机制，并为设计适合不同环境情景的耐旱玉米品种提供工具。

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