Max Planck Institute for Plant Breeding Research, Cologne, Germany.
Genome. 2011 Aug;54(8):674-83. doi: 10.1139/G11-031. Epub 2011 Aug 17.
Insufficient iron (Fe) availability, which frequently occurs in soils with high pH levels, can lead to leaf chlorosis, a reduced Fe content in harvest products, and yield reduction in maize. The objectives of this study were (i) to describe patterns of sequence variation of 14 candidate genes for mobilization, uptake, and transport of Fe in maize, as well as regulatory function on these processes; (ii) to examine whether Fe-efficiency is an adaptive trait by determining if these genes were targets of selection during domestication; and (iii) to test if the allele distribution at these candidate genes is different for the different subpopulations of maize. The nucleotide diversity of Mtk was reduced by 78% in maize compared with teosinte. The results of our study revealed for the genes Naat1, Nas1, Nramp3, Mtk, and Ys1 a selective sweep, which suggests that these genes might be important for the fast adaptation of maize to new environments with different Fe availabilities.
土壤 pH 值较高时，铁（Fe）的供应不足会导致叶片失绿、作物中 Fe 含量降低以及玉米减产。本研究的目的是：(i) 描述玉米中 Fe 动员、摄取和转运的 14 个候选基因以及对这些过程的调控功能的序列变异模式；(ii) 通过确定这些基因在驯化过程中是否是选择的目标，来检验 Fe 效率是否是一个适应性特征；(iii) 检测这些候选基因的等位基因分布在不同的玉米亚群中是否存在差异。与墨西哥类蜀黍相比，玉米中 Mtk 的核苷酸多样性降低了 78%。我们的研究结果表明，Naat1、Nas1、Nramp3、Mtk 和 Ys1 这几个基因存在着选择清除现象，这表明这些基因可能对玉米快速适应不同 Fe 可利用性的新环境非常重要。
