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Genetic diversity and geographical peculiarity of Tibetan wild soybeanTI Genetic diversity and geographical peculiarity of Tibetan wild soybean (Glycine soja)

机译：藏野大豆的遗传多样性和地理特征TI藏野大豆的遗传多样性和地理特征

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Tibet is the highest Plateau in China and the world, however wild soybean has been found in its southeastern fringe region adjacent to the northwest of Yunnan Province. Tibetan wild soybean was distributed only in the Gongrigabuqu-River Gorge in southeast Tibet. This regional plant species belong to the flora of Himalayan-Hengduan Mountains, which comprises composite elements of ancient arcto-tertiary flora, tropical and semitropical flora. To date, few studies have been carried out on Tibetan wild soybean. Studying Tibetan wild soybean together with other regional ones helps to understand the history of the origin and dissemination of wild soybean species in China. Here we reported the status of genetic diversity in Tibetan wild soybean and the genetic relationship between Tibetan and other regional wild soybeans revealed by nuclear SSR markers. The results showed that the Tibetan wild soybean sample was significantly differentiated from other regional ones, as characterized by the lowest mean allelic richness ((r) over cap = 1.40) and gene diversity (H (e) = 0.130) and the highest ratios of regionally unique alleles (63.26%) and fixed alleles (46.94%). These genetic attributes suggested that Tibetan wild soybean may have undergone severe adaptation selection for the plateau climate and ecogeographical conditions, and had less genetic exchange with inland populations. The regional population south of the Changjiang River (Central and South China) showed higher genetic richness. UPGMA cluster analysis revealed two large geographical groups, Tibetan and inland, and revealed closer relationship among the eastern populations, which suggested that the dissemination of this species in the eastern part of China might be rapider.
机译：西藏是中国乃至世界最高的高原，但是在其东南边缘地区与云南省西北部相邻的地方发现了野生大豆。西藏野生大豆仅分布在西藏东南部的贡里格布曲河峡谷。这种区域性植物物种属于喜马拉雅-横断山脉的植物区系，其中包括古老的第三纪植物区系，热带和亚热带植物区系的复合元素。迄今为止，关于藏野大豆的研究很少。对西藏野生大豆和其他地区大豆的研究有助于了解中国野生大豆品种的起源和传播历史。在这里，我们报道了通过核SSR标记揭示的藏野大豆遗传多样性状况以及藏野与其他区域野生大豆之间的遗传关系。结果表明，西藏野生大豆样品与其他区域样品有显着差异，其特征是平均等位基因丰富度最低（（r）上限为1.40）和基因多样性（H（e）= 0.130），且最高比率为区域独特等位基因（63.26％）和固定等位基因（46.94％）。这些遗传属性表明，西藏野生大豆可能已针对高原气候和生态地理条件进行了严格的适应选择，并且与内陆种群的遗传交换较少。长江以南的区域人口（中部和华南地区）显示出较高的遗传丰富度。 UPGMA聚类分析揭示了藏族和内陆两个较大的地理群体，并揭示了东部种群之间的紧密联系，这表明该物种在中国东部的传播可能更快。

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