DATASET: Host filtering, not competitive exclusion, is the main driver of arbuscular mycorrhizal fungal community assembly under high phosphorus

We conducted a factorial pot experiment where sorghum (<em>Sorghum bicolor</em>) was grown under three different P treatments (low, medium, high), in the presence or absence of a natural AM fungal community. By analysing the diversity and community structure of the fungal communities colonising roots, we aimed to determine if and how soil P influences the relatedness of these communities and whether competitive exclusion or environmental filtering play a more significant role in their assembly. Additionally, we evaluated the concomitant outcomes for plant growth, nutrient acquisition, and defensive chemistry (phenolics).

本研究开展了一项双因素析因盆栽试验，以高粱（*Sorghum bicolor*）为供试作物，设置3个磷素（P）处理水平（低磷、中磷、高磷），并在每个磷素水平下分别设置天然丛枝菌根（Arbuscular Mycorrhizal, AM）真菌群落存在与不存在两个亚组。通过分析定殖于宿主根系的真菌群落的多样性与群落结构，本研究旨在明确土壤磷素含量是否及如何影响此类真菌群落的亲缘关联特征，并探究竞争排除与环境过滤这两种过程在其群落构建中何者占据主导地位。此外，本研究还同步评估了该试验对植物生长、养分获取以及防御性化学成分（酚类物质）产生的伴随效应。