Phylogeny and molecular evolution of the DMC1 gene within the StH genome species in Triticeae (Poaceae)
Wang, Xiao-Li | Fan, Xing | Zeng, Jian | Sha, Li-Na | Zhang, Hai-Qin | Kang, Hou-Yang | Yang, Rui-Wu | Zhang, Li | Ding, Chun-Bang | Zhou, Yong-Hong
To estimate the phylogeny and molecular evolution of a single-copy nuclear disrupted meiotic cDNA (DMC1) gene within the StH genome species, two DMC1 homoeologous sequences were isolated from nearly all the sampled StH genome species and were analyzed with those from seven diploid taxa representing the St and H genomes in Triticeae. Sequence diversity patterns and genealogical analysis suggested that (1) there is a close relationship among North American StH genome species; (2) the DMC1 gene sequences of the StH genome species from North America and Eurasia are evolutionarily distinct; (3) the StH genome polyploids have higher levels of sequence diversity in the St genome homoeolog than the H genome homoeolog; (4) the DMC1 sequence may evolve faster in the polyploid species than in the diploids; (5) high dN and dN/dS values in the St genome within polyploid species could be caused by low selective constraints or AT-biased mutation pressure. Our result provides some insight on evolutionary dynamics of duplicate DMC1 gene, the polyploidization events and phylogeny of the StH genome species.
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