Spatial structure of genetic and chemical variation in native populations of the mile-a-minute weed Mikania micrantha
Spatial structure of genetic and chemical variation in native populations of the mile-a-minute weed Mikania micrantha
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DOI：
10.1016/j.bse.2017.11.008
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发表时间：
2018-02-01
影响因子：
1.6
通讯作者：
Javier Espinosa-Garcia, Francisco
中科院分区：
文献类型：
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作者：
Eliezer Bravo-Monzon, Angel;Gonzalez-Rodriguez, Antonio;Javier Espinosa-Garcia, Francisco
我们利用6个特定的微卫星对来自大西洋和太平洋流域的13个墨西哥薇甘菊(菊科)种群的遗传多样性和挥发性萜类多样性的空间分布和潜在关系进行了研究。所有种群的遗传多样性都很低(H-E=0.00-0.37)，这可能是由于克隆繁殖和/或它们相对于整个美洲物种分布的边缘位置所致。我们发现在大西洋种群中存在显著的地区间遗传分化和更多的遗传结构，曼特尔检验也显示出按距离隔离的模式(r(2)=0.478，P=0.002)。此外，我们发现了三个与地理障碍相匹配的遗传障碍，可能是导致种群隔离的原因。遗传多样性的地理格局与化学多样性的地理格局进行了比较，但我们发现种群的遗传距离和化学距离之间没有相关性。我们的结果表明，中性分子标记和适应性特征，如防御性代谢物，提供了补充信息，可能被证明是有用的，为入侵植物物种选择生防剂。(C)2017爱思唯尔有限公司。保留所有权利。
We examined the spatial distribution and potential relationship of genetic and volatile terpenoid diversity in 13 Mexican populations of Mikania micrantha (Asteraceae) from the Atlantic and Pacific watersheds using six specific microsatellites. A low genetic diversity was observed in all populations (H-E = 0.00-0.37), which may be attributed to clonal reproduction and/or their marginal location relative to the whole species distribution in the Americas. We found a significant genetic differentiation between regions, and more genetic structure in Atlantic populations where a Mantel test also showed a pattern of isolation by distance (r(2) = 0.478, P = 0.002). In addition, we detected three genetic barriers that match geographic barriers and may be responsible for population isolation. The geographic patterns of genetic diversity were compared to those from chemical diversity but we found no correlation between the genetic and chemical distances of the populations. Our results suggest that neutral molecular markers and adaptive traits like defensive metabolites provide complementary information that may prove useful during the selection of biocontrol agents for invasive plant species. (C) 2017 Elsevier Ltd. All rights reserved.