Causes and consequences of differences in soil and seed microbiomes for two alpine plants
Causes and consequences of differences in soil and seed microbiomes for two alpine plants
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DOI：
10.1007/s00442-022-05271-z
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发表时间：
2022-10
期刊：
影响因子：
2.7
通讯作者：
N. Luecke;C. P. B. de Mesquita;Madeline Luong;S. K. Schmidt;K. Suding;K. Crawford
中科院分区：
文献类型：
--
作者：
N. Luecke;C. P. B. de Mesquita;Madeline Luong;S. K. Schmidt;K. Suding;K. Crawford
种子和土壤微生物组强烈影响植物的性能，并且这些影响可以扩大到影响植物群落结构。然而，种子和土壤微生物群落组成在不同景观中是不同的，不同的微生物群落可以对多种植物指标（生物量、发芽率）和群落稳定机制产生不同的影响。我们确定了种子和土壤中的微生物组在高山植物物种和植物物种丰富度和密度不同的群落之间如何变化。在 10 种常见的高山植物物种中，我们总共发现了 318 个细菌和 128 个真菌操作分类单位 (OTU) 与种子相关，其中真菌丰富度受植物物种身份的影响大于采样地点。然而，种子微生物对植物发芽成功和时间的影响只有轻微的显着影响。相比之下，与两种不同植物物种相关的土壤微生物对植物生物量具有显着影响，其影响取决于植物物种和土壤采样地点。这导致不同地点的植物-土壤反馈发生显着变化，植物密度和丰富度各不相同，因此植物-土壤反馈有利于某些地点的植物物种共存，而反对其他地点的共存。重要的是，我们发现促进共存的反馈与植物物种丰富度低有关，这表明土壤微生物可能在气候变化和冰川衰退过程中促进定殖植物的多样性。
Seed and soil microbiomes strongly affect plant performance, and these effects can scale-up to influence plant community structure. However, seed and soil microbial community composition are variable across landscapes, and different microbial communities can differentially influence multiple plant metrics (biomass, germination rate), and community stabilizing mechanisms. We determined how microbiomes inside seeds and in soils varied among alpine plant species and communities that differed in plant species richness and density. Across 10 common alpine plant species, we found a total of 318 bacterial and 128 fungal operational taxonomic units (OTUs) associated with seeds, with fungal richness affected by plant species identity more than sampling location. However, seed microbes had only marginally significant effects on plant germination success and timing. In contrast, soil microbes associated with two different plant species had significant effects on plant biomass, and their effect depended both on the plant species and the location the soils were sampled from. This led to significant changes in plant-soil feedback at different locations that varied in plant density and richness, such that plant-soil feedback favored plant species coexistence in some locations and opposed coexistence at other locations. Importantly, we found that coexistence-facilitating feedback was associated with low plant species richness, suggesting that soil microbes may promote the diversity of colonizing plants during the course of climate change and glacial recession.