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    Molecular evolution and diversity of dimeric alpha-amylase inhibitor gene in Kengyilia species (Triticeae: Poaceae)

    数:2013-09-16 16:52:50 来源: chaopeng97免费的女人 生态环境研究所

    Molecular evolution and diversity of dimeric alpha-amylase inhibitor gene in Kengyilia species (Triticeae: Poaceae). Gene, 2013,529:262-268.

    Zeng J1,2, Fan X3, Sha LN3, Kang HY3, Wang Y3, Zhang HQ3, Zhou YH3

    1 Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China;

    2 College of Resources and Environment, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China;

    3 Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China

    Abstarct: Kengyilia Yen et J. L. Yang is a group of allohexaploid species with StYP genomic constitutions in the wheat tribe. To investigate the evolution and diversity of dimeric alpha-amylase inhibitor genes in the Kengyilia, forty-five homoeologous DAAI gene sequences were isolated from sampled Kengyilia species and analyzed together with those of its close relatives. These results suggested that (1) Kengyilia species from Central Asia and the Qinghai –Tibetan Plateau had different origins from thoseof the geographically differentiated P genome; (2) the St and P genomes of Kengyilia were donated by Pseudoroegneria and Agropyron, respectively, and the Y genome had an independent origin and showed an affinity with the St genome; (3) purifying selection dominated the DAAI gene members and the St-DAAI gene was evolving at faster rate than the P- and Y-DAAI genes in Kengyilia; and (4) natural selection was the main factor on the codon usage pattern of the DAAI gene in Kengyilia.
    Keywords: Kengyilia, Genome differentiation, Diversity, Evolution

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