Migration of soil microbes may promote tree seedling tolerance to drying conditions
Migration of soil microbes may promote tree seedling tolerance to drying conditions
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DOI：
10.1002/ecy.2729
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发表时间：
2019-08-05
期刊：
影响因子：
4.8
通讯作者：
Lankau, Richard
中科院分区：
文献类型：
--
作者：
Allsup, Cassandra;Lankau, Richard
土壤-微生物相互作用有可能调节树木种群在当前位置持续存在或在新地区建立的能力。来自干燥环境的微生物类群的迁移可能促进幼苗对干燥气候的耐受性。在温室试验中，我们在不同的降水和土壤类型、水分充足和水分减少的条件下，对9个地点的奥斯特利亚（Ostrya virginia）和黑桦树（Betula nigra）幼苗进行了试验，分别交换了无菌土壤和本地和外来微生物接种剂。沿纬度而非纵向梯度交换微生物接种物与非生物土壤导致幼苗生物量减少。此外，在缺水条件下，当盆栽接种来自干燥地点的微生物时，生长最大化。这些结果表明，由于微生物与土壤条件的不匹配，当地微生物分类群的灭绝和/或新微生物分类群的迁移可能对植物生长有害。然而，适应干旱的微生物类群的迁移可能为面临干旱条件的植物种群提供额外的耐旱性。这项工作有助于了解微生物相互作用如何可能加剧或减轻气候变化对植物种群造成的挑战。
Soil-microbe interactions have the potential to mediate the ability of tree populations to persist in their current location or establish in new areas. Immigration of microbial taxa from drier conditions may promote seedling tolerance to drying climates. In a greenhouse experiment, we determined seedling performance of Ostrya virginiana and Betula nigra seedlings after experimentally swapping sterilized soils and local and foreign microbial inocula from nine sites over a gradient of precipitation and soil types, in well-watered and water reduced conditions. Swapping microbial inocula relative to abiotic soils along latitudinal, but not longitudinal, gradients resulted in reduced seedling biomass. Additionally, growth in water reduced conditions was maximized when pots were inoculated with microbes from drier sites. These results suggest that extirpation of local microbial taxa, and/or immigration of novel microbial taxa to a site may be detrimental to plant growth due to mismatches between microbes and soil conditions. However, immigration of drought adapted microbial taxa may provide additional drought tolerance to plant populations facing drying conditions. This work contributes to the understanding of how microbial interactions may potentially exacerbate or mitigate challenges to plant populations caused by climate change.