Genomic and chemical evidence for local adaptation in resistance to different herbivores in Datura stramonium

Since most species are collections of genetically variable populations distributed to habitats differing in their abiotic/biotic environmental factors and community composition, the pattern and strength of natural selection imposed by species on each others' traits are also expected to be highly spatially variable. Here, we used genomic and quantitative genetic approaches to understand how spatially variable selection operates on the genetic basis of plant defenses to herbivores. To this end, an F2 progeny was generated by crossing Datura stramonium (Solanaceae) parents from two populations differing in their level of chemical defense. This F2 progeny was reciprocally transplanted into the parental plants’ habitats and by measuring the Identity by Descent (IBD) relationship of each F2 plant to each parent, we were able to elucidate how spatially variable selection imposed by herbivores operated on the genetic background (IBD) of resistance to herbivory, promoting local adaptation. The r...由于多数物种均由携带遗传变异的种群构成，且分布于非生物/生物环境因子及群落组成存在差异的生境中，因此物种间通过相互性状施加的自然选择模式与强度，预计也会呈现显著的空间异质性。本研究采用基因组学与数量遗传学方法，解析空间异质性选择如何作用于植物对抗植食性动物的防御性状遗传基础。为此，我们选取两个化学防御水平存在差异的曼陀罗（Datura stramonium，茄科Solanaceae）种群作为亲本进行杂交，获得F2代后代群体。我们将该F2代群体双向移栽至两个亲本种群的原生境中，并通过测定每株F2植株与各亲本的同源同一性（Identity by Descent, IBD）关系，阐明了植食性动物施加的空间异质性选择如何作用于抗植食性的遗传背景（IBD），进而推动本地适应的发生。The r...