A polygenic architecture with habitat‐dependent effects underlies ecological differentiation in Silene

• DOI: 10.1111/nph.18260
• Publication Date: 2022-05-19T07:48:50Z
• Authors: Susanne Gramlich; Xiaodong Liu; Adrien Favre; C. Alex Buerkle; Sophie Karrenberg
• Keywords: Silene; Genetic architecture

Summary Ecological differentiation can drive speciation but it is unclear how the genetic architecture of habitat‐dependent fitness contributes to lineage divergence. We investigated cumulative flowering, a component, in second‐generation hybrids between Silene dioica and latifolia transplanted into natural habitat each species. used reduced‐representation sequencing Bayesian sparse linear mixed models (BSLMMs) analyze control flowering habitat. Our results point polygenic flowering. Allelic effects were mostly beneficial or deleterious one neutral other. Positive‐effect alleles often derived from native species, whereas negative‐effect alleles, at other loci, tended originate non‐native conclude that ecological governed maintained by many loci with small, consistent conditional neutrality. This pattern may result differences selection targets two habitats environmentally dependent load. further suggest for against acts as barrier gene flow