Mertens Arne, Brys Rein, Schouppe Dorien, Jacquemyn Hans
Department of Biology, Plant Conservation and Population Biology, KU Leuven, Leuven, Belgium.
Research Institute for Nature and Forest, Geraardsbergen, Belgium.
AoB Plants. 2018 Sep 7;10(5):ply051. doi: 10.1093/aobpla/ply051. eCollection 2018 Oct.
The genetic diversity and structure of plant populations are determined by the interaction of three distinct processes: gene flow, genetic drift and natural selection. These processes are to some extent dependent on the mating system of plants, which in turn is largely determined by floral morphology and the level of herkogamy in particular. In this study, we used molecular markers to investigate the impact of floral morphology on genetic differentiation and structure in two closely related species that display large variation in floral morphology across two distinct geographic regions in Europe (mainland Europe and the UK). Our results showed that genetic differences between regions and populations within regions were similar for both species, but that patterns of genetic structure largely depended on the observed variation in floral morphology. Populations of showed higher genetic differentiation and clear isolation by distance (IBD) in mainland Europe, but limited IBD in the UK. Opposite patterns were found in , with higher genetic differentiation and significant IBD in populations sampled in the UK and lower genetic differentiation in Continental populations with no pattern of IBD. Overall, these results indicate that variation in floral morphology has a profound impact on structuring of genetic diversity, with populations displaying low levels of herkogamy showing the strongest patterns of genetic structuring and the reverse pattern in populations showing high levels of herkogamy.
基因流、遗传漂变和自然选择。这些过程在一定程度上取决于植物的交配系统，而交配系统又在很大程度上由花的形态，特别是雌雄异位水平决定。在本研究中，我们使用分子标记来研究花的形态对两个密切相关物种的遗传分化和结构的影响，这两个物种在欧洲两个不同地理区域（欧洲大陆和英国）的花形态上表现出很大差异。我们的结果表明，两个物种区域间以及区域内种群间的遗传差异相似，但遗传结构模式在很大程度上取决于观察到的花形态变化。在欧洲大陆，[物种名称1]的种群表现出较高的遗传分化和明显的距离隔离（IBD），但在英国IBD有限。在[物种名称2]中发现了相反的模式，在英国采样的种群中遗传分化较高且有显著的IBD，而在大陆种群中遗传分化较低且没有IBD模式。总体而言，这些结果表明花形态的变化对遗传多样性结构有深远影响，雌雄异位水平低的种群显示出最强的遗传结构模式，而雌雄异位水平高的种群则呈现相反模式。
