Dominant role of abundant rather than rare bacterial taxa in maintaining agro-soil microbiomes under environmental disturbances
Dominant role of abundant rather than rare bacterial taxa in maintaining agro-soil microbiomes under environmental disturbances
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丰富而不是稀有的细菌类群在环境干扰下维持农业土壤微生物组中的主导作用
DOI：
10.1016/j.chemosphere.2019.06.174
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发表时间：
2019-11-01
期刊：
影响因子：
8.8
通讯作者：
Lu, Yahai
中科院分区：
文献类型：
--
作者：
Jiao, Shuo;Wang, Junman;Lu, Yahai
阐明丰富和稀有微生物类群对环境干扰的响应机制对于理解生物多样性与稳定性的关系和维持微生物多样性至关重要。在这里，我们探讨了丰富和罕见的细菌类群的干扰入侵植物生长和石油污染的农业土壤在一个大的空间尺度（纬度梯度= 18.62度-46.51度）的响应模式。我们基于现有Illumina测序数据集的荟萃分析表明，丰富的类群在干扰下持续存在，而稀有类群更容易受到影响，这表明丰富类群对干扰的弹性或抗性更高。丰富的类群的响应与采样点的年平均温度，而罕见的类群，而不是表现出随机响应。有显着的负线性回归之间的细菌α多样性和社区的差异性（扰动与原状土壤），表明更强的弹性或电阻在那些细菌群落具有较高的α多样性。这种弹性或阻力主要与丰富的类群的α多样性。我们的网络分析表明，干扰大大降低了连接的强度，放松了共生关系，并重塑了复杂的细菌相互作用。在未扰动的土壤中，丰富的分类群比稀有分类群更频繁地位于网络的中心位置，而在扰动的土壤中，这些趋势则相反。我们的研究结果表明，丰富的类群在农业土壤细菌群落的稳定和维持中起主导作用，而稀有类群可以极大地影响环境干扰下当地细菌的相互作用。(C)2019爱思唯尔有限公司版权所有。
Elucidating the mechanisms underpinning the responses of abundant and rare microbial taxa to environmental disturbances is essential for understanding the biodiversity-stability relationship and maintaining microbial diversity. Here, we explored the response patterns of abundant and rare bacterial taxa to disturbances by invasive plant growth and oil contamination in agricultural soils across a large spatial scale (latitude gradient = 18.62 degrees-46.51 degrees). Our meta-analysis based on existing Illumina sequencing datasets showed that abundant taxa persisted under the disturbances whereas rare taxa were more easily affected, indicating the higher resilience or resistance of abundant taxa to disturbances. The responses of abundant taxa were associated with mean annual temperature at the sampling sites, while rare taxa instead showed stochastic responses. There were significantly negative linear regressions between bacterial alpha-diversity and community dissimilarities (disturbed vs. undisturbed soils), suggesting stronger resilience or resistance in those bacterial communities with higher alpha-diversity. This resilience or resistance was mainly associated with the alpha-diversity of abundant taxa. Our network analysis showed that the disturbances substantially decreased the strength of the connections, loosened the co occurrence relationships, and reshaped the complex bacterial interactions. In the undisturbed soils, abundant taxa were located in central positions within the network more often than were rare taxa, while these trends were reversed in the disturbed soils. Our results suggest that abundant taxa play a dominant role in the stability and maintenance of agro-soil bacterial communities, while rare taxa could greatly influence local bacterial interactions under environmental disturbances. (C) 2019 Elsevier Ltd. All rights reserved.