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A B73 x Palomero Toluqueño mapping population reveals local adaptation in Mexican highland maize
bioRxiv - Plant Biology Pub Date : 2021-09-18 , DOI: 10.1101/2021.09.15.460568
Sergio Perez-Limon , Meng Li , G. Carolina Cintora-Martinez , M. Rocio Aguilar-Rangel , M. Nancy Salazar-Vidal , Eric Gonzalez-Segovia , Karla A Blöcher-Juárez , Alejandro Guerrero-Zavala , Benjamín Barrales-Gamez , Jessica L Carcaño-Macias , Denise E Costich , Jorge Nieto-Sotelo , Octavio Martinez-De la Vega , June Simpson , Matthew Hufford , Jeffrey Ross-Ibarra , Sherry Flint-Garcia , Luis Diaz-Garcia , Ruben Rellan-Alvarez , Ruairidh JH Sawers

Generations of farmer selection have produced a unique collection of traditional maize varieties adapted to the environmental challenges of the central Mexican highlands. In addition to agronomic and cultural value, Mexican highland maize represents a good system for the study of local adaptation and acquisition of adaptive phenotypes under cultivation. In this study, we characterized a recombinant inbred line population derived from the cross of the B73 reference line and the Mexican highland maize variety Palomero Toluqueño. Evaluation over multiple years in lowland and highland field sites in Mexico identified genomic regions linked to yield components and putatively adaptive morphological traits. A region on chromosome 7 associated with ear weight showed antagonistic allelic effects in lowland and highland fields, suggesting a trade-off consistent with local adaptation. We identified several alleles of highland origin associated with characteristic highland traits, including reduced tassel branching, increased stem pigmentation and the presence of stem macrohairs. The oligogenic architecture of characteristic morphological traits supports their role in adaptation, suggesting they have arisen from consistent directional selection acting at distinct points across the genome. We discuss these results in the context of the origin of phenotypic novelty during selection, commenting on the role of de novo mutation and the acquisition of adaptive variation by gene flow from endemic wild relatives.

中文翻译:

B73 x Palomero Toluqueño 绘图种群揭示了墨西哥高原玉米的局部适应性

一代又一代的农民选择生产了一系列独特的传统玉米品种,以适应墨西哥中部高地的环境挑战。除了农艺和文化价值外,墨西哥高地玉米代表了一个很好的系统,可用于研究当地适应性和获得栽培适应性表型。在这项研究中,我们表征了源自 B73 参考系和墨西哥高原玉米品种 Palomero Toluqueño 杂交的重组自交系种群。对墨西哥低地和高地田地的多年评估确定了与产量成分和假定的适应性形态特征相关的基因组区域。7 号染色体上与穗重相关的区域在低地和高地田地表现出拮抗等位基因效应,建议与本地适应一致的权衡。我们鉴定了几个与高原特征相关的高原起源等位基因,包括减少雄穗分枝、增加茎色素沉着和茎粗毛的存在。特征形态特征的寡基因结构支持它们在适应中的作用,表明它们是由在整个基因组的不同点上作用的一致定向选择产生的。我们在选择过程中表型新颖性起源的背景下讨论了这些结果,评论了 特征形态特征的寡基因结构支持它们在适应中的作用,表明它们是由在整个基因组的不同点上作用的一致定向选择产生的。我们在选择过程中表型新颖性起源的背景下讨论了这些结果,评论了 特征形态特征的寡基因结构支持它们在适应中的作用,表明它们是由在整个基因组的不同点上作用的一致定向选择产生的。我们在选择过程中表型新颖性起源的背景下讨论了这些结果,评论了通过地方性野生近缘种的基因流从头突变和获得适应性变异。
更新日期:2021-09-21
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