Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108, USA.
J Hered. 2013 Sep-Oct;104(5):666-77. doi: 10.1093/jhered/est046. Epub 2013 Jul 26.
Ipomoea purpurea (common morning glory) is an annual vine native to Mexico that is well known for its large, showy flowers. Humans have spread morning glories worldwide, owing to the horticultural appeal of morning glory flowers. Ipomoea purpurea is an opportunistic colonizer of disturbed habitats including roadside and agricultural settings, and it is now regarded as a noxious weed in the Southeastern US. Naturalized populations in the Southeastern United States are highly polymorphic for a number of flower color morphs, unlike native Mexican populations that are typically monomorphic for the purple color morph. Although I. purpurea was introduced into the United States from Mexico, little is known about the specific geographic origins of US populations relative to the Mexican source. We use resequencing data from 11 loci and 30 I. purpurea accessions collected from the native range of the species in Central and Southern Mexico and 8 accessions from the Southeastern United States to infer likely geographic origins in Mexico. Based on genetic assignment analysis, haplotype composition, and the degree of shared polymorphism, I. purpurea samples from the Southeastern United States are genetically most similar to samples from the Valley of Mexico and Veracruz State. This supports earlier speculation that I. purpurea in the Southeastern United States was likely to have been introduced by European colonists from sources in Central Mexico.
紫茉莉（普通牵牛花）是一种原产于墨西哥的一年生藤本植物，以其大而艳丽的花朵而闻名。由于牵牛花的园艺吸引力，人类已经将其传播到世界各地。紫茉莉是一种机会主义的定居者，它会侵占受干扰的栖息地，包括路边和农业环境，现在在美国东南部被认为是一种有害杂草。与典型的紫色花色形态的墨西哥本土种群不同，美国东南部的归化种群在许多花色形态上具有高度多态性。尽管紫茉莉是从墨西哥引入美国的，但关于美国种群相对于墨西哥来源的具体地理起源，人们知之甚少。我们使用来自 11 个位点和 30 个紫茉莉个体的重测序数据，这些个体来自墨西哥中部和南部的物种原生范围以及来自美国东南部的 8 个个体，以推断墨西哥的可能起源地。基于遗传归属分析、单倍型组成和共享多态性程度，美国东南部的紫茉莉样本在遗传上与墨西哥谷地和韦拉克鲁斯州的样本最为相似。这支持了早先的推测，即美国东南部的紫茉莉很可能是由欧洲殖民者从中部墨西哥的来源引入的。
