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首页> 美国卫生研究院文献>Ecology and Evolution >Effects of the Tanaka Line on the genetic structure of Bombax ceiba (Malvaceae) in dry‐hot valley areas of southwest China
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Effects of the Tanaka Line on the genetic structure of Bombax ceiba (Malvaceae) in dry‐hot valley areas of southwest China

机译：田中线对西南干热河谷地区木棉树遗传结构的影响

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摘要

Southwest China is an important biodiversity hotspot. The interactions among the complex topography, climate change, and ecological factors in the dry‐hot valley areas in southwest China may have profoundly affected the genetic structure of plant species in this region. In this study, we determined the effects of the Tanaka Line on genetic variation in the wild Bombax ceiba tree in southwest China. We sampled 224 individuals from 17 populations throughout the dry‐hot valley regions. Six polymorphic expressed sequence tag–simple sequence repeat primers were employed to sequence the PCR products using the first‐generation Sanger technique. The analysis based on population genetics suggested that B. ceiba exhibited a high level of gene diversity (H E: 0.2377–0.4775; I: 0.3997–0.7848). The 17 populations were divided into two groups by cluster analysis, which corresponded to geographic characters on each side of the Tanaka Line. In addition, a Mantel test indicated that the phylogeographic structure among the populations could be fitted to the isolation‐by‐distance model (r 2 = .2553, p < .001). A barrier test indicated that there were obstacles among populations and between the two groups due to complex terrain isolation and geographic heterogeneity. We inferred that the Tanaka Line might have promoted the intraspecific phylogeographic subdivision and divergence of B. ceiba. These results provide new insights into the effects of the Tanaka Line on genetic isolation and population differentiation of plant species in southwest China.
机译：中国西南部是重要的生物多样性热点。西南干热河谷地区复杂地形，气候变化和生态因素之间的相互作用可能深刻影响了该地区植物的遗传结构。在这项研究中，我们确定了田中线对中国西南野生木棉树遗传变异的影响。我们从整个干旱热谷地区的17个人口中抽取了224个人。使用第一代Sanger技术，使用六种多态表达序列标签-简单序列重复引物对PCR产物进行测序。基于种群遗传学的分析表明，ceiba表现出高水平的基因多样性（H E：0.2377–0.4775; I：0.3997–0.7848）。通过聚类分析将这17个种群分为两组，这与田中线两侧的地理特征相对应。此外，一项Mantel测试表明，种群之间的地理结构可能适合按距离隔离模型（r 2 =。2553，p <.001）。障碍测试表明，由于复杂的地形隔离和地理异质性，人口之间以及两组之间存在障碍。我们推断，田中线可能促进了B.ceiba的种内系统学细分和发散。这些结果为田中线对中国西南地区植物物种遗传分离和种群分化的影响提供了新的见解。

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