Root microbiota assembly and adaptive differentiation among European Arabidopsis populations.,Nature Ecology & Evolution

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Root microbiota assembly and adaptive differentiation among European Arabidopsis populations.
Nature Ecology & Evolution ( IF 13.9 ) Pub Date : 2019-12-23 , DOI: 10.1038/s41559-019-1063-3
Thorsten Thiergart ₁ , Paloma Durán ₁ , Thomas Ellis ₂ , Nathan Vannier ₁ , Ruben Garrido-Oter _{1,

3} , Eric Kemen ₄ , Fabrice Roux ₅ , Carlos Alonso-Blanco ₆ , Jon Ågren ₂ , Paul Schulze-Lefert _{1,

3} , Stéphane Hacquard _{1,

3}

Affiliation

Factors that drive continental-scale variation in root microbiota and plant adaptation are poorly understood. We monitored root-associated microbial communities in Arabidopsis thaliana and co-occurring grasses at 17 European sites across 3 years. We observed strong geographic structuring of the soil biome, but not of the root microbiota. A few phylogenetically diverse and geographically widespread bacteria consistently colonized plant roots. Among-site and across-year similarity in microbial community composition was stronger for the bacterial root microbiota than for filamentous eukaryotes. In a reciprocal transplant between two A. thaliana populations in Sweden and Italy, we uncoupled soil from location effects and tested their contributions to root microbiota variation and plant adaptation. Community differentiation in plant roots was explained primarily by location for filamentous eukaryotes and by soil origin for bacteria, whereas host genotype effects were marginal. Strong local adaptation between the two A. thaliana populations was observed, with differences in soil properties and microbes of little importance for the observed magnitude of adaptive differentiation. Our results suggest that, across large spatial scales, climate is more important than soil conditions for plant adaptation and variation in root-associated filamentous eukaryotic communities, whereas soil properties are primary drivers of bacterial community differentiation in roots.

中文翻译：

欧洲拟南芥种群的根微生物群组装和适应性分化。

驱动根系微生物群和植物适应的大陆尺度变化的因素知之甚少。我们在 3 年内监测了拟南芥和共生草中 17 个欧洲地点的根相关微生物群落。我们观察到土壤生物群落的强烈地理结构，但没有观察到根微生物群的地理结构。一些系统发育多样且地理分布广泛的细菌始终定植于植物根部。细菌根微生物群的微生物群落组成的位点间和跨年相似性比丝状真核生物更强。在瑞典和意大利的两个拟南芥种群之间的相互移植中，我们将土壤与位置效应分离，并测试了它们对根系微生物群变异和植物适应的贡献。植物根部的群落分化主要由丝状真核生物的位置和细菌的土壤来源来解释，而宿主基因型效应则微乎其微。观察到两个拟南芥种群之间的强烈局部适应性，土壤性质和微生物的差异对于观察到的适应性分化程度无关紧要。我们的研究结果表明，在大空间尺度上，对于植物适应和根相关丝状真核生物群落的变异，气候比土壤条件更重要，而土壤特性是根中细菌群落分化的主要驱动因素。观察到拟南芥种群，土壤特性和微生物的差异对于观察到的适应性分化程度无关紧要。我们的研究结果表明，在大空间尺度上，对于植物适应和根相关丝状真核生物群落的变异，气候比土壤条件更重要，而土壤特性是根中细菌群落分化的主要驱动因素。观察到拟南芥种群，土壤特性和微生物的差异对于观察到的适应性分化程度无关紧要。我们的研究结果表明，在大空间尺度上，对于植物适应和根相关丝状真核生物群落的变异，气候比土壤条件更重要，而土壤特性是根中细菌群落分化的主要驱动因素。

更新日期：2019-12-23

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