J Syst Evol ›› 2016, Vol. 54 ›› Issue (3): 250-263.doi: 10.1111/jse.12188

• Research Articles • Previous Articles     Next Articles

Phylogeny and molecular evolution of the DMC1 gene in the polyploid genus Leymus (Triticeae: Poaceae) and its diploid relatives

Li-Na Sha1,2, Xing Fan1, Hai-Qin Zhang1, Hou-Yang Kang1, Yi Wang1, Xiao-Li Wang3, Xiao-Fang Yu4, and Yong-Hong Zhou1,2*   

  1. 1Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China
    2Key Laboratory of Crop Genetic Resources and Improvement, Ministry of Education, Sichuan Agricultural University, Yaan 625014, Sichuan, China
    3College of Life Science, Sichuan Agricultural University, Yaan 625014, Sichuan, China
    4College of Landscape Architecture, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China
  • Received:2015-09-22 Online:2015-11-26 Published:2016-01-21

Abstract: The level and pattern of nucleotide variation in duplicate genes provide important information on the evolutionary history of polyploids and divergent processes between homoeologous loci within lineages. Leymus, a group of allopolyploid species with the NsXm genomes, is a perennial genus with a diverse array of morphology, ecology, and distribution in Triticeae. To estimate the phylogeny and molecular evolution of a single-copy DMC1 gene in Leymus and its diploid relatives,DMC1 homoeologous sequences were isolated from the sampled Leymus species and were analyzed with those from 30 diploid taxa representing 18 basic genomes in Triticeae. Sequence diversity patterns and genealogical analysis suggested that: (i) different Leymus species might derive their Ns genome from different Psathyrostachys species; (ii) Pseudoroegneria has contributed to the nuclear genome of some Leymus species, which might result from recurrent hybridization or incomplete lineage sorting; (iii) the Xm genome origin of Leymus could differ among species; (iv) rapid radiation and multiple origin might account for the rich diversity, numbers of species, and wide ecological adaptation of Leymus species; and (v) the DMC1 sequence diversity of the Ns genome in Leymus species was lower than that in the Psathyrostachys diploids, while the level of DMC1 sequence diversity in Leymus was higher than that in diploid Pseudoroegneria. Our results provide new insight on the evolutionary dynamics of duplicate DMC1 genes, polyploid speciation, and the phylogeny of Leymus species.

Key words: DMC1, evolutionary pattern, Leymus, phylogeny, polyploidy.

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