Going with the flow: analysis of population structure reveals high gene flow shaping invasion pattern and inducing range expansion of Mikania micrantha in Asia
Going with the flow: analysis of population structure reveals high gene flow shaping invasion pattern and inducing range expansion of Mikania micrantha in Asia
复制标题
随波逐流：种群结构分析揭示了高基因流塑造了薇甘菊在亚洲的入侵模式并导致其范围扩大
DOI：
10.1093/aob/mcaa044
复制
发表时间：
2020-06-04
期刊：
影响因子：
4.2
通讯作者：
Huang, Yelin
中科院分区：
文献类型：
--
作者：
Banerjee, Achyut Kumar;Hou, Zhuangwei;Huang, Yelin
薇甘菊（Mikania micrantha）是菊科多年生攀援杂草，原产于拉丁美洲，在亚洲热带地区具有高度入侵性。大洋洲和澳大利亚。本研究旨在研究亚洲大空间尺度下薇甘菊（M.薇甘菊）的种群结构，并探讨其引种历史、进化力量和景观特征对该地区薇甘菊遗传格局的影响。方法对46个群体1052个个体的12个微卫星位点进行遗传多样性和结构分析。通过估计遗传距离与影响种群间基因流动的地理、气候和景观抗性之间的关系，研究了遗传变异的空间格局。结果与其他入侵物种的遗传多样性参数相比，该地区薇甘菊具有较高的遗传多样性。空间聚类和非空间聚类算法可识别多个遗传聚类和种群间混杂的存在。大多数群体表现出杂合子缺乏，主要是由于近亲繁殖，创始群体表现出遗传瓶颈的证据。在入侵范围内持续的基因流动导致种群间的遗传分化较低，并为异质环境中的边缘种群提供了有益的遗传变异。环境适宜性对近交的不利影响有缓冲作用。线性和非线性回归模型均显示遗传距离与地理距离、生物气候变量与环境阻力面之间存在较弱的关系。结论广泛的基因流动和种群间的混合影响了该地区薇甘菊的遗传模式。入侵地的高基因流可能促进种群的适应、建立和长期持续，从而表明物种的范围扩展能力。
Background and Aims Mikania micrantha, a climbing perennial weed of the family Asteraceae, is native to Latin America and is highly invasive in the tropical belt of Asia. Oceania and Australia. This study was framed to investigate the population structure of M. micrantha at a large spatial scale in Asia and to identify bow introduction history, evolutionary forces and landscape features influenced the genetic pattern of the species in this region.Methods We assessed the genetic diversity and structure of 1052 individuals from 46 populations for 12 microsatellite loci. The spatial pattern of genetic variation was investigated by estimating the relationship between genetic distance and geographical, climatic and landscape resistances hypothesized to influence gene flow between populations.Key Results We found high genetic diversity of M. micrantha in this region, as compared with the genetic diversity parameters of other invasive species. Spatial and non-spatial clustering algorithms identified the presence of multiple genetic clusters and admixture between populations. Most of the populations showed heterozygote deficiency, primarily due to inbreeding, and the founder populations showed evidence of a genetic bottleneck. Persistent gene flow throughout the invasive range caused low genetic differentiation among populations and provided beneficial genetic variation to the marginal populations in a heterogeneous environment. Environmental suitability was found to buffer the detrimental effects of inbreeding at the leading edge of range expansion. Both linear and non-linear regression models demonstrated a weak relationship between genetic distance and geographical distance, as well as bioclimatic variables and environmental resistance surfaces.Conclusions These findings provide evidence that extensive gene flow and admixture between populations have influenced the current genetic pattern of M. micrantha in this region. High gene flow across the invaded landscape may facilitate adaptation, establishment and long-term persistence of the population, thereby indicating the range expansion ability of the species.