A single domestication for maize shown by multilocus microsatellite genotyping
A single domestication for maize shown by multilocus microsatellite genotyping
复制标题
DOI：
10.1073/pnas.052125199
复制
发表时间：
2002-04-30
影响因子：
11.1
通讯作者：
Doebley, J
中科院分区：
文献类型：
--
作者：
Matsuoka, Y;Vigouroux, Y;Doebley, J
在前哥伦布时期的栽培者培育的玉米地方品种中存在着非同寻常的形态和遗传多样性。为了解释玉米的高度多样性，一些作者提出玉米地方品种是其野生亲缘种（大刍草）多次独立驯化的产物。我们提出了基于264个单株植物的系统发育分析，每个植物在99个微卫星上进行基因分型，这挑战了多起源假说。相反，我们的研究结果表明，所有的玉米都起源于大约9000年前墨西哥南部的一次驯化。我们的分析还表明，现存最古老的玉米类型是墨西哥高地的玉米，玉米从该地区沿两条主要路径传播到美洲。我们的系统发育工作与基于考古记录的模型一致，该模型表明玉米在传播到低地之前在墨西哥高地多样化。我们还发现只有少量的证据表明驯化后的基因从大刍草流向玉米。
There exists extraordinary morphological and genetic diversity among the maize landraces that have been developed by pre-Columbian cultivators. To explain this high level of diversity in maize, several authors have proposed that maize landraces were the products of multiple independent domestications from their wild relative (teosinte). We present phylogenetic analyses based on 264 individual plants, each genotyped at 99 microsatellites, that challenge the multiple-origins hypothesis. Instead, our results indicate that all maize arose from a single domestication in southern Mexico about 9,000 years ago. Our analyses also indicate that the oldest surviving maize types are those of the Mexican highlands with maize spreading from this region over the Americas along two major paths. Our phylogenetic work is consistent with a model based on the archaeological record suggesting that maize diversified in the highlands of Mexico before spreading to the lowlands. We also found only modest evidence for postdomestication gene flow from teosinte into maize.