Divergence with gene flow is driven by local adaptation to temperature and soil phosphorus concentration in teosinte subspecies (Zea mays parviglumis and Zea mays mexicana)
Divergence with gene flow is driven by local adaptation to temperature and soil phosphorus concentration in teosinte subspecies (Zea mays parviglumis and Zea mays mexicana)
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DOI：
10.1111/mec.15098
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发表时间：
2019-06-01
影响因子：
4.9
通讯作者：
Eguiarte, Luis E.
中科院分区：
文献类型：
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作者：
Aguirre-Liguori, Jonas A.;Gaut, Brandon S.;Eguiarte, Luis E.
杂交类群之间的基因组趋异模式沿着基因组可以是异质的。差异渐渗和当地的适应可能有助于这种模式。在这里，我们分析了两个大刍草亚种，玉米ssp。parviglumis和ssp.墨西哥，以测试他们的分歧是否发生在面对基因流，并推断哪些环境变量一直是其生态分化的重要驱动力。我们为47个群体生成了9，780个DArTseqTM SNP，并使用了包含49个群体的33，454个MaizeSNP 50 SNP的额外数据集。利用这些数据，我们推断了人口统计学历史的特征，并进行了全基因组扫描，以确定与气候和土壤变量相关的离群SNP的数量。这两个数据集表明，分歧已经发生或保持，尽管连续的基因流和/或二次接触。大多数显着的SNP协会的温度和土壤中的磷浓度。这些候选SNPs中的很大一部分位于以前被确定为推定倒位的高分化区域。因此，我们提出，基因组分化的大刍草发生了适应性分歧的过程中，与推定的倒位有助于减少基因流之间的本地适应人群。
Patterns of genomic divergence between hybridizing taxa can be heterogeneous along the genome. Both differential introgression and local adaptation may contribute to this pattern. Here, we analysed two teosinte subspecies, Zea mays ssp. parviglumis and ssp. mexicana, to test whether their divergence has occurred in the face of gene flow and to infer which environmental variables have been important drivers of their ecological differentiation. We generated 9,780 DArTseqTM SNPs for 47 populations, and used an additional data set containing 33,454 MaizeSNP50 SNPs for 49 populations. With these data, we inferred features of demographic history and performed genome wide scans to determine the number of outlier SNPs associated with climate and soil variables. The two data sets indicate that divergence has occurred or been maintained despite continuous gene flow and/or secondary contact. Most of the significant SNP associations were to temperature and to phosphorus concentration in the soil. A large proportion of these candidate SNPs were located in regions of high differentiation that had been identified previously as putative inversions. We therefore propose that genomic differentiation in teosintes has occurred by a process of adaptive divergence, with putative inversions contributing to reduced gene flow between locally adapted populations.