Plant mutualisms with rhizosphere microbiota in introduced versus native ranges

The performance of introduced plants can be limited by the availability of soil mutualists outside their native range, but how interactions with mutualists differ between ranges is largely unknown. If mutualists are absent, incompatible or parasitic, plants may compensate by investing more in root biomass, adapting to be more selective or by maximizing the benefits associated with the mutualists available. We tested these hypotheses using seven non-agricultural species of Trifolium naturalized in New Zealand (NZ). We grew seeds from two native (Spain, UK) and one introduced (NZ) provenance of each species in glasshouse pots inoculated with rhizosphere microbiota collected from conspecifics in each region. We compared how plant biomass, degree of colonization by rhizobia and arbuscular mycorrhizal fungi (AMF), and the growth benefit associated with each mutualist differed between provenances (native and introduced populations) when grown with soil microbiota from each region. We also tes...

外来引种植物的生长表现往往会受到其本土分布范围外土壤共生微生物可获得性的限制，但目前学界对不同分布范围内植物与共生微生物的互作模式差异仍不甚明晰。若共生微生物缺失、不相容或呈寄生状态，植物可通过增加根系生物量投入、优化共生选择性，或是最大化利用现有共生微生物所带来的生长收益来进行适应性补偿。本研究以在新西兰（NZ）归化的7种非农业用三叶草属（Trifolium）植物为研究对象，对上述假说开展验证。我们将每个物种的2份本土种源（西班牙、英国）与1份引种种源（新西兰）的种子，分别播种于经各区域同种植物根际微生物群落接种的温室盆栽基质中。我们对比了不同种源（本土种群与引种种群）在接种各区域土壤微生物群落时的植株生物量、根瘤菌与丛枝菌根真菌（AMF）的定殖程度，以及与每种共生微生物相关的生长收益差异。我们还开展了相关测试（原文内容未完整提供）