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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Influence of Forest Trees on the Distribution of Mineral Weathering-Associated Bacterial Communities of the Scleroderma citrinum Mycorrhizosphere
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Influence of Forest Trees on the Distribution of Mineral Weathering-Associated Bacterial Communities of the Scleroderma citrinum Mycorrhizosphere

机译：林木对柑桔硬皮菌根际矿物与风化相关细菌群落分布的影响

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In acidic forest soils, availability of inorganic nutrients is a tree-growth-limiting factor. A hypothesis to explain sustainable forest development proposes that tree roots select soil microbes involved in central biogeochemical processes, such as mineral weathering, that may contribute to nutrient mobilization and tree nutrition. Here we showed, by combining soil analyses with cultivation-dependent analyses of the culturable bacterial communities associated with the widespread mycorrhizal fungus Scleroderma citrinum, a significant enrichment of bacterial isolates with efficient mineral weathering potentials around the oak and beech mycorrhizal roots compared to bulk soil. Such a difference did not exist in the rhizosphere of Norway spruce. The mineral weathering ability of the bacterial isolates was assessed using a microplaque assay that measures the pH and the amount of iron released from biotite. Using this microplate assay, we demonstrated that the bacterial isolates harboring the most efficient mineral weathering potential belonged to the Burkholderia genus. Notably, previous work revealed that oak and beech harbored very similar pHs in the 5- to 10-cm horizon in both rhizosphere and bulk soil environments. In the spruce rhizosphere, in contrast, the pH was significantly lower than that in bulk soil. Because the production of protons is one of the main mechanisms responsible for mineral weathering, our results suggest that certain tree species have developed indirect strategies for mineral weathering in nutrient-poor soils, which lie in the selection of bacterial communities with efficient mineral weathering potentials.
机译：在酸性森林土壤中，无机养分的可利用性是限制树木生长的因素。解释森林可持续发展的假设提出，树木的根部选择参与中央生物地球化学过程（例如矿物风化）的土壤微生物，这可能有助于养分的动员和树木的营养。在这里，我们表明，通过结合土壤分析和对与广泛菌根真菌柑桔硬菌相关的可培养细菌群落的依赖于培养的分析，与散装土壤相比，橡树和山毛榉菌根根周围的有效矿物风化潜力大大增强了细菌分离株的富集。挪威云杉的根际不存在这种差异。使用微噬斑测定法评估细菌分离物的矿物风化能力，该测定法可测量黑云母的pH和铁释放量。使用该微孔板测定法，我们证明了具有最有效矿物风化潜力的细菌分离株属于伯克霍尔德菌属。值得注意的是，先前的工作表明，在根际和大块土壤环境中，橡木和山毛榉在5至10厘米范围内的pH值非常相似。相反，在云杉根际中，pH显着低于散装土壤中的pH。由于质子的产生是造成矿物风化的主要机制之一，因此我们的结果表明，某些树种已经开发出了在营养贫瘠的土壤中进行矿物风化的间接策略，这取决于选择具有有效矿物风化潜力的细菌群落。

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