State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Hubei, China.
School of Life Sciences, Central China Normal University, Hubei, China.
Glob Chang Biol. 2021 Aug;27(16):3911-3922. doi: 10.1111/gcb.15683. Epub 2021 May 31.
As the number of non-native invasive species in the world is increasing, there is a pressing need to understand the effects of invasive species on recipient biotic communities to improve our ability to migrate or relieve their potential negative effects on biodiversity and ecosystem functions. Plant invasions have been shown to impose great threats to aboveground biotic communities; however, invasive impacts on soil biota remain ambiguous, partially because of the paucity of studies with a large number of species across biogeographic gradients. Here, we characterized rhizosphere fungal communities of 53 native and invasive plants spanning approximately 1800 km in China, as well as eight pairs of phylogenetically related native versus invasive plants in a greenhouse experiment. The results of both field survey and greenhouse experiment showed that rhizosphere fungal composition was primarily predicted by plant phylogeny (e.g. family and species), and plant geographic origin (native vs. invasive) and abiotic factors had much smaller effects. We detected no differences in the number and relative abundance of total and family/species-specific OTUs (i.e. overall, pathogens and mutualists) associated with these native and invasive plants on average, suggesting novel co-evolution between native soil fungi and these invasive plants. These results suggest that non-native plant invasions had only a weak impact on soil fungi, partially due to stronger controls of plant evolution on rhizosphere fungi and adaptation of native fungi to these invasive species. Interestingly, rhizosphere fungal composition was more variable between invasive plants than between native plants at middle latitudes, potentially creating spatial variations in plant-soil interactions and, in turn, invasion dynamics. These novel findings highlight the importance of integrating phylogenetic and biogeographical approaches to explore invasive effects on native biota.
随着世界上非本地入侵物种数量的增加，迫切需要了解入侵物种对受纳生物群落的影响，以提高我们迁移或缓解其对生物多样性和生态系统功能潜在负面影响的能力。植物入侵已被证明对地上生物群落构成巨大威胁；然而，入侵对土壤生物区系的影响仍不明确，部分原因是缺乏在生物地理梯度上具有大量物种的研究。在这里，我们对中国约 1800 公里范围内的 53 种本地和入侵植物的根际真菌群落进行了特征描述，以及在温室实验中对 8 对系统发育相关的本地与入侵植物进行了特征描述。实地调查和温室实验的结果均表明，根际真菌组成主要由植物系统发育（如科和种）、植物地理起源（本地与入侵）和非生物因素预测，而这些因素的影响要小得多。我们没有检测到与这些本地和入侵植物相关的总 OTU 和科/种特异性 OTU（即总体上、病原体和共生体）的数量和相对丰度存在差异，这表明本地土壤真菌与这些入侵植物之间存在新的共同进化。这些结果表明，非本地植物入侵对土壤真菌的影响较弱，部分原因是植物进化对根际真菌的控制更强，以及本地真菌对这些入侵物种的适应性。有趣的是，在中纬度地区，根际真菌组成在入侵植物之间的变异性大于在本地植物之间的变异性，这可能会导致植物-土壤相互作用的空间变化，并进而影响入侵动态。这些新发现强调了综合系统发育和生物地理方法来探索入侵对本地生物群的影响的重要性。
