Genetic diversity and population structure of teosinte
Genetic diversity and population structure of teosinte
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DOI：
10.1534/genetics.104.031393
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发表时间：
2005-04-01
期刊：
影响因子：
3.3
通讯作者：
Doebley, J
中科院分区：
文献类型：
--
作者：
Fukunaga, K;Hill, J;Doebley, J
类蜀黍是玉米最接近的野生近缘种，是研究玉米遗传和进化以及植物育种的重要资源。我们对 237 个类蜀黍植物的 93 个微卫星进行了基因分型。物种和亚种类群之间的系统发育关系与之前对其他类型分子标记的分析基本一致。尽管物种之间的关系尚未完全解决，但所有物种的植物都形成单系进化枝。系统发育分析表明，墨西哥一年生类蜀黍分为两个簇，很大程度上对应于先前定义的亚种，Z mays ssp。 parviglumis 和 ssp。墨西哥，尽管有一些样本代表这两个亚种之间的进化中间体或杂交种。墨西哥一年生类蜀黍显示出沿地理线的遗传亚结构。一些类蜀黍和玉米之间的杂交或基因渗入发生在低水平，并且在 Z mays ssp 中最常见。墨西哥。墨西哥一年生类蜀黍的系统发育地理学和系统发育分析表明，ssp。 parviglumis 在其分布的东部地区多样化，并从东向西传播。墨西哥在墨西哥中部高原多样化，并沿着多条路径向北部和东部传播。我们定义了 Z mays ssp 集合的核心集。墨西哥和亚省parviglumis 试图捕获最大数量的微卫星等位基因可原谅的样本量。
The teosintes, the closest wild relatives of maize, are important resources for the study of maize genetics and evolution and for plant breeding. We genotyped 237 individual teosinte plants for 93 microsatellites. Phylogenetic relationships among species and subspecific taxa were largely consistent with prior analyses for other types of molecular markers. Plants of all species formed monophyletic clades, although relationships among species were not fully resolved. Phylogenetic analysis indicated that the Mexican annual teosintes divide into two clusters that largely correspond to the previously defined subspecies, Z mays ssp. parviglumis and ssp. mexicana, although there are a few samples that represent either evolutionary intermediates or hybrids between these two subspecies. The Mexican annual teosintes show genetic substructuring along geographic lines. Hybridization or introgression between some teosintes and maize occurs at a low level and appears most common with Z mays ssp. mexicana. Phylogeographic and phylogenetic analyses of the Mexican annual teosintes indicated that ssp. parviglumis diversified in the eastern part of its distribution and spread from east to west and that ssp. mexicana diversified in the Central Plateau of Mexico and spread along multiple paths to the north and east. We defined core sets of collections of Z mays ssp. mexicana and ssp. parviglumis that attempt to capture the maximum number of microsatellite alleles forgiven sample sizes.