Evolution, Ecology, and Organismal Biology Department, The Ohio State University, 318 W 12th Avenue Aronoff Laboratory floor 3 Columbus, Columbus, OH, 43201, USA.
Department of Ecology & Evolutionary Biology, University of Kansas, 1200 Sunnyside Avenue Lawrence, KS, 66045, USA.
Mycorrhiza. 2024 Nov;34(5-6):463-475. doi: 10.1007/s00572-024-01168-2. Epub 2024 Sep 18.
Microbial community assembly involves a series of ecological filtering mechanisms that determine the composition of microbial communities. While the importance of both broad and local level factors on microbial communities has been reasonably well studied, this work often is limited to single observations and neglects to consider how communities change over time (i.e., seasonal variation). Because seasonal variation is an important determinant of community assembly and determines the relative importance of community assembly filters, this represents a key knowledge gap. Due to their close associations with seasonal variation in plant growth and fitness, arbuscular mycorrhizal (AM) fungi are useful groups for assessing the importance of seasonal dynamics in microbial community assembly. We tested how seasonal variation (spring vs. summer), plant life history stage (vegetative vs. flowering), and host plant species (Baptisia bracteata var. leucophaea & Andropogon gerardii) influenced AM fungal spore community assembly. AM fungal spore community temporal dynamics were closely linked to plant host species and life history stage. While AM fungal spore communities demonstrated strong turnover between the spring (e.g., higher sporulation) and late summer (e.g., higher diversity), the strength and direction of these changes was modified by host plant species. Here we demonstrate the importance of considering temporal variation in microbial community assembly, and also show how plant-microbe interactions can modify seasonal trends in microbial community dynamics.
微生物群落组装涉及一系列生态过滤机制，这些机制决定了微生物群落的组成。虽然广泛和局部水平因素对微生物群落的重要性已经得到了相当充分的研究，但这项工作通常仅限于单一的观察，忽略了考虑群落随时间（即季节性变化）的变化。由于季节性变化是群落组装的重要决定因素，并决定了群落组装过滤器的相对重要性，因此这代表了一个关键的知识空白。由于与植物生长和适应性的季节性变化密切相关，丛枝菌根（AM）真菌是评估微生物群落组装季节性动态重要性的有用群体。我们测试了季节性变化（春季与夏季）、植物生活史阶段（营养生长与开花）和宿主植物物种（Baptisia bracteata var. leucophaea 和 Andropogon gerardii）如何影响 AM 真菌孢子群落组装。AM 真菌孢子群落的时间动态与植物宿主物种和生活史阶段密切相关。虽然 AM 真菌孢子群落之间存在很强的转换（例如，更高的孢子形成）从春季（例如，更高的多样性）到夏末（例如，更高的多样性），但这些变化的强度和方向被宿主植物物种所修饰。在这里，我们展示了考虑微生物群落组装时间变化的重要性，并展示了植物-微生物相互作用如何改变微生物群落动态的季节性趋势。
