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首页> 外文期刊>Genetic Resources and Crop Evolution >Genetic differentiation of Actinidia chinensis and analysis of gene flow barriers in the Qinling Mountains, the species' northern distribution boundary
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Genetic differentiation of Actinidia chinensis and analysis of gene flow barriers in the Qinling Mountains, the species' northern distribution boundary

机译：秦岭北岭基因流动障碍分析猕猴桃遗传分化，物种北部分布边界

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摘要

The Qinling Mountains form the geo-ecological boundary between subtropical and warm-temperate zones in China and represent the northern boundary for the range of native Actinidia chinensis. To protect, explore and make use of natural resources more effectively, factors influencing genetic diversity of species must be determined. Whether the complex demography of the Qinling Mountains significantly influences gene flow of Actinidia species remains unknown. We assessed genetic diversity and structure of A. chinensis populations in the Qinling Mountains using genomic- and EST-SSR markers. We also conducted barrier analysis to detect genetic discontinuity and isolated pools within structured populations. A total of 179 alleles were detected in six natural A. chinensis populations with an average of 14.9 alleles per locus. Overall, genetic differentiation among A. chinensis populations was low but was stronger than that of populations on either the northern or southern slopes. Analysis of molecular variance showed that 25.97% of the total variance occurred among populations, whereas 74.03% of the total variance occurred within populations. The strongest gene flow occurred between the PX population on the southern slope and the LX population on the northern slope. A UPGMA dendrogram revealed that LX and PX populations were clustered together in one group. The other populations were clustered into another group. A Mantel test revealed no significant correlation between genetic and geographical distances. Clear genetic structure was revealed, and four geographic barriers were identified within and among five areas located in the western, central and eastern Qinling Mountains. Gene flow among populations was restricted by the primary ridges of the Qinling Mountains extending west to east, with branches advancing north to south.
机译：秦岭山脉在中国的亚热带和温水区之间形成了地理生态边界，代表了北部边界的土着猕猴桃。为了更有效地保护，探索和利用自然资源，必须确定影响物种遗传多样性的因素。秦岭的复杂人口统计是否显着影响猕猴桃物种的基因流仍然未知。使用基因组和EST-SSR标记，我们评估了秦岭中的A.Chinensis群体的遗传多样性和结构。我们还进行了障碍分析，以检测结构化群体中的遗传不连续性和隔离池。在六种天然A.Chinensis群中，共检测到179个等位基因，平均每位基因座平均为14.9等位基因。总体而言，A.Chinensis人群中的遗传分化低，但比北方或南坡的人群更强劲。分子方差分析表明，群体中出现的总方差的25.97％，而群体的总方差的74.03％。在南坡上的PX群和北坡上的LX群之间发生最强的基因流。 UPGMA树枝图显示LX和PX种群在一个组中聚集在一起。将其他人群聚集在另一组中。壁炉架测试显示遗传和地理距离之间没有显着相关性。揭示了清晰的遗传结构，并在西部，中部和东部秦岭的五个地区确定了四个地理障碍。人群中的基因流动受到西部西部延伸到东部的秦岭初级山脊的限制，分支机构向南前进。

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