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Mapping quantitative trait loci for aflatoxin accumulation resistance in two populations containing resistant maize inbred Mp717
Crop Science ( IF 2.3 ) Pub Date : 2021-12-21 , DOI: 10.1002/csc2.20695
J. Spencer Smith 1 , William Paul Williams 1 , Marilyn Warburton 1 , Gary Windham 1 , Wenwei Xu 2 , Dinakar Bhattramakki 3
Affiliation  

Mp717, a maize germplasm line resistant to aflatoxin accumulation, served as the resistant parent in two bi-parental quantitative trait loci (QTL) mapping populations: Mp717 × Va35 and Mp717 × PHW79. Both populations were phenotyped for concentration of total aflatoxins following artificial inoculation in replicated field trials grown in four environments. In all four environments in which the Mp717 × Va35 population was evaluated, the majority of the explained phenotypic variance was due to QTL for which the aflatoxin-reducing allele was contributed by Va35, not Mp717. When the data were combined across environments, Mp717 contributed the beneficial allele for four QTL, but those QTL individually explained only 2.5 to 5.4% of the phenotypic variance. In contrast, Mp717 was the source of the resistance allele for the majority of the QTL observed in the Mp717 × PHW79 population in all four environments. When the data were combined across environments, Mp717 was the source of the resistance allele for eight QTL that individually explained 3.5 to 8.7% of the phenotypic variance. Three of those QTL individually explained 7.7 to 8.7% of the phenotypic variance, but none of those three QTL were observed in the Mp717 × Va35 population. Due to the small effect size of most observed QTL and the inconsistency across genetic backgrounds of the few medium-effect QTL that were detected, it was concluded that no resistance QTL suitable for marker-assisted introgression of the resistance present in Mp717 were detected in these two populations.

中文翻译:

在含有抗性玉米自交系 Mp717 的两个种群中绘制抗黄曲霉毒素积累抗性数量性状基因座

Mp717 是一种抗黄曲霉毒素积累的玉米种质系,在两个双亲数量性状基因座 (QTL) 作图群体中充当抗性亲本:Mp717 × Va35 和 Mp717 × PHW79。在四种环境中生长的重复田间试验中人工接种后,对两个种群的总黄曲霉毒素浓度进行表型分析。在评估 Mp717 × Va35 种群的所有四种环境中,大多数解释的表型变异是由于 QTL 造成的,其中减少黄曲霉毒素的等位基因是由 Va35 贡献的,而不是 Mp717。当跨环境组合数据时,Mp717 贡献了四个 QTL 的有益等位基因,但这些 QTL 单独解释了表型变异的 2.5% 至 5.4%。相比之下,Mp717 是在所有四种环境中在 Mp717 × PHW79 群体中观察到的大多数 QTL 的抗性等位基因的来源。当跨环境组合数据时,Mp717 是 8 个 QTL 的抗性等位基因的来源,它们分别解释了 3.5% 到 8.7% 的表型变异。其中三个 QTL 分别解释了 7.7% 到 8.7% 的表型变异,但在 Mp717 × Va35 群体中没有观察到这三个 QTL。由于大多数观察到的 QTL 的效应大小较小,并且检测到的少数中等效应 QTL 的遗传背景不一致,因此得出的结论是,在这些基因中没有检测到适用于 Mp717 中存在的抗性的标记辅助渐渗的抗性 QTL两个种群。当跨环境组合数据时,Mp717 是 8 个 QTL 的抗性等位基因的来源,它们分别解释了 3.5% 到 8.7% 的表型变异。其中三个 QTL 分别解释了 7.7% 到 8.7% 的表型变异,但在 Mp717 × Va35 群体中没有观察到这三个 QTL。由于大多数观察到的 QTL 的效应大小较小,并且检测到的少数中等效应 QTL 的遗传背景不一致,因此得出的结论是,在这些基因中没有检测到适用于 Mp717 中存在的抗性的标记辅助渐渗的抗性 QTL两个种群。当跨环境组合数据时,Mp717 是 8 个 QTL 的抗性等位基因的来源,它们分别解释了 3.5% 到 8.7% 的表型变异。其中三个 QTL 分别解释了 7.7% 到 8.7% 的表型变异,但在 Mp717 × Va35 群体中没有观察到这三个 QTL。由于大多数观察到的 QTL 的效应大小较小,并且检测到的少数中等效应 QTL 的遗传背景不一致,因此得出的结论是,在这些基因中没有检测到适用于 Mp717 中存在的抗性的标记辅助渐渗的抗性 QTL两个种群。7% 的表型变异,但在 Mp717 × Va35 群体中没有观察到这三个 QTL。由于大多数观察到的 QTL 的效应大小较小,并且检测到的少数中等效应 QTL 的遗传背景不一致,因此得出的结论是,在这些基因中没有检测到适用于 Mp717 中存在的抗性的标记辅助渐渗的抗性 QTL两个种群。7% 的表型变异,但在 Mp717 × Va35 群体中没有观察到这三个 QTL。由于大多数观察到的 QTL 的效应大小较小,并且检测到的少数中等效应 QTL 的遗传背景不一致,因此得出的结论是,在这些基因中没有检测到适用于 Mp717 中存在的抗性的标记辅助渐渗的抗性 QTL两个种群。
更新日期:2021-12-21
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