Differentiating genetic and environmental drivers of plant–pathogen community interactions

摘要: Summary Plant genotypic variation can shape associated arthropod and microbial communities locally, as has been demonstrated in controlled common garden experiments. However, the relative roles of plant genetics environment defining at larger spatial scales are not well known. The environmental heterogeneity hypothesis maintains that genetic effects on diminish across landscape predominates. Alternatively, local adaptation argues change landscapes a result species interactions being locally adapted. Thus, very different mechanisms could produce similar patterns. Using replicated gardens located along an elevation distance gradient, observational studies wild, greenhouse inoculation experiment, we examined these two non-mutually exclusive hypotheses for Populus angustifolia its fungal leaf pathogen community. Supporting hypothesis, were to three times stronger within than among gardens. Consistent with pathogens also varied significantly (i.e. G × E interaction effect). Observational data from wild our experiment unveiled clinal resistance is correlated disease risk but did support plants or vice versa. Synthesis. While study found genotype plays significant role shaping geographic scales, most strongly influenced P. angustifolia scale. Plant by environment, highlighting potential (e.g. climate) trigger evolutionary responses plant–pathogen community interactions.