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Soil fungi rather than bacteria were modified by invasive plants, and that benefited invasive plant growth

机译：入侵植物对土壤真菌而不是细菌进行了改良，这有利于入侵植物的生长

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Successful invasion by exotic plant species can modify the abundance and composition of soil microbial communities. Eupatorium adenophora and Chromolaena odorata are exotics that have become highly invasive plants in China. Several studies have investigated mechanisms of their successful invasions including phenotypic plasticity, genetic differentiation, and allelopathy, but little is known about their effects on soil microorganisms. Moreover, whether soil microbial community changes could cause feedback effects on these plant species is also not known. We seek a belowground microbiological mechanism supporting successful invasions by these exotic plants. In this study, two invasive (E. adenophora and C. odorata) and two native plant species (Eupatorium japonicum and Eupatorium heterophyllum) were used to compare the soil feedback (on plant growth) before and after soil sterilization and from plant-root exudates. Bacterial and fungal biomass and community composition were also examined. We found that soil sterilization significantly increased biomass of native species and did not affect the invasive species' biomass. After root exudates from these plants had acted on the soil biota for 10 months, soil sterilization significantly decreased the growth of E. adenophora and C. odorata and continued to significantly increase the biomass of two native species. Denaturing gradient gel electrophoresis revealed that these four plant species modified fungal rather than bacterial communities in soil. Higher abundance of Paraglomus sp. in soil with C. odorata is likely to provide C. odorata roots with more soil nutrients. Considered together, these results strongly suggest that invasive E. adenophora and C. odorata created a belowground feedback that may be a mechanism contributing to their success as invasive species.RI Feng, Yulong/B-7416-2012
机译：外来植物物种的成功入侵可以改变土壤微生物群落的丰度和组成。紫茎泽兰和Chromolaena odorata是在中国已成为高度入侵植物的外来植物。几项研究已经调查了它们成功入侵的机制，包括表型可塑性，遗传分化和化感作用，但对其对土壤微生物的影响知之甚少。而且，还不清楚土壤微生物群落的变化是否会引起对这些植物物种的反馈作用。我们寻求一种地下微生物机制来支持这些外来植物的成功入侵。在这项研究中，使用了两种侵入性（紫茎泽兰和香茅）和两种原生植物物种（紫茎泽兰和异叶紫茎泽兰）来比较土壤灭菌前后和根部分泌物的土壤反馈（关于植物生长）。 。还检查了细菌和真菌的生物量和群落组成。我们发现土壤灭菌显着增加了本地物种的生物量，并且不影响入侵物种的生物量。这些植物的根系分泌物作用于土壤生物区系10个月后，土壤灭菌显着降低了紫茎泽兰和香茅的生长，并继续显着增加了两种天然物种的生物量。变性梯度凝胶电泳显示这四种植物修饰了土壤中的真菌而不是细菌群落。较高的Paraglomus sp。在有香紫苏的土壤中，可能为香紫苏的根提供更多的土壤养分。综合考虑，这些结果强烈表明，入侵性紫茎泽兰和香茅（C.odorata）产生了地下反馈，这可能是其作为入侵物种成功的一种机制.RI Feng，Yulong / B-7416-2012

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