Chaïr H, Perrier X, Agbangla C, Marchand J L, Dainou O, Noyer J L
CIRAD, Montpellier, France.
Genome. 2005 Aug;48(4):674-84. doi: 10.1139/g05-018.
The Dioscorea cayenensis - Dioscorea rotundata species complex is the most widely cultivated yam in West Africa. This species complex has been described as deriving from wild yams belonging to the Enanthiophyllum section through domestication by African farmers. To study patterns of yam evolution and to establish phylogenetic relationships existing between wild and cultivated species sampled in Benin, we investigated changes in chloroplast DNA simple sequence repeats (cpSSR) in 148 yam accessions selected to cover the wider possible genetic diversity existing in the country. Dioscorea cayenensis and D. rotundata share the same haplotype. The morphotype "abyssinica" appeared to be subdivided into 2 haplotypes. One of these haplotypes shares the same haplotype with the Dioscorea cayenensis - Dioscorea rotundata species complex and with morphotypes praehensilis, suggesting that they might belong to the same species. Relationships among sections Lasiophyton, Macrocapaea, Opsophyton, and Enanthiophyllum were clarified, and some taxonomic changes within the Enanthiophyllum section were suggested. Dioscorea minutiflora, D. smilacifolia, and D. burkilliana might be considered as 1 single genetic group, and they are suspected of belonging to the same species.
甘薯 - 圆甘薯种复合体是西非种植最广泛的山药品种。该种复合体被认为是非洲农民通过对属于Enanthiophyllum组的野生山药进行驯化培育而来。为了研究山药的进化模式，并确定在贝宁采集的野生和栽培品种之间存在的系统发育关系，我们调查了148份山药种质中叶绿体DNA简单序列重复（cpSSR）的变化，这些种质的选择旨在涵盖该国可能存在的更广泛的遗传多样性。甘薯和圆甘薯具有相同的单倍型。“阿比西尼亚”形态型似乎可细分为2个单倍型。其中一个单倍型与甘薯 - 圆甘薯种复合体以及praehensilis形态型具有相同的单倍型，这表明它们可能属于同一物种。明确了Lasiophyton、Macrocapaea、Opsophyton和Enanthiophyllum组之间的关系，并提出了Enanthiophyllum组内的一些分类学变化。小花山药、菝葜叶山药和伯克氏山药可能被视为一个单一的遗传群体，并且怀疑它们属于同一物种。
