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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Evidence on the origin of cassava: Phylogeography of Manihot escuienta
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Evidence on the origin of cassava: Phylogeography of Manihot escuienta

机译：木薯起源的证据：Manihot escuienta的系统志

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Cassava (Manihot esclenta subsp. esculenta) is a staple crop with great economic importancr worldwide, yet its evolutionary and geographical origins have remained unresolved and controversial. We have investigated this crop's domestication in a phylogeographic study based on the single-copy nuclear gene glyceraldehyde 3-phosphate dehydrogenase (G3pdh). The G3pdh locus provides high levels of noncoding sequence variation in cassava and its wild relatives, with 28 haplotypes identified among 212 individuals (424 alleles) examined. These data represent one of the first uses of a single-copy nuclear gene in a Plant phylogeographic study and yield several important insights into cassava's evolutionary origin: (i) cassava was likely domesticated from wild M esculenu' populations along the southern border of the Amazon basin; (ii) the crop does not seem to be derivcd from several progenitor species, as previously proposed; and (iii) cassava does not share haplotypes with Manihot pruinosa, a closely related, potentially hybridizing species. These findings provide the clearest picture to date on cassava's origin. When considered in a genealogical context, relationships among the G3pdh haplotypes are incongruent with taxonomic boundaries, beth within M. esculenta and at the interspecific level, this incongruence is probably a result of lineage sorting among these recently diverged taxa. Although phylogeographic studies in animals have provided many new evolutionary insights, application of phylogeography in plants has been hampered by difficulty in obtaining phylogenetically informat
机译：木薯（Manihot esclenta esculenta esculenta）是世界范围内具有重要经济意义的主食作物，但其进化和地理起源仍未得到解决和有争议。我们已经在基于单拷贝核基因甘油醛3-磷酸脱氢酶（G3pdh）的系统地理学研究中研究了该农作物的驯化。 G3pdh基因座在木薯及其野生近缘种中提供了高水平的非编码序列变异，在212个个体（424个等位基因）中鉴定出28个单倍型。这些数据代表了单拷贝核基因在植物系统地理学研究中的首次使用，并提供了对木薯进化起源的一些重要见解：（i）木薯很可能是从亚马逊南部边界上的野生M esculenu种群驯化的盆地; （ii）作物似乎并非像以前所提议的那样是从几种祖先物种衍生而来的； （iii）木薯不与Manihot pruinosa（一种密切相关且可能杂交的物种）共享单倍型。这些发现提供了迄今为止关于木薯起源的最清晰的图景。当从族谱的角度考虑时，G3pdh单倍型之间的关系与分类界线不一致，在贝氏藻中以及在种间水平上，这种不一致性很可能是这些最近分化的类群之间沿袭排序的结果。尽管对动物的地理学研究提供了许多新的进化见解，但由于难以获得系统信息，因此难以将植物学应用于植物

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