Environmental filtration and host selection effect influence bacterial community assembly in broad-leaved Korean pine forests: A regional scale study

IF 4.8 2区 农林科学 Q1 SOIL SCIENCE Applied Soil Ecology Pub Date : 2024-10-03 DOI:10.1016/j.apsoil.2024.105664
Honglin Wang , Changcheng Mu , Guoyong Yan , Yajuan Xing , Qinggui Wang
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Abstract

In forest ecosystems, the bacterial communities primarily establish symbiotic relationships with host plants, facilitating various ecological niches across different spatial scales. However, our understanding of bacterial community assembly mechanisms at both regional distribution scales and within different niche habitats of hosts remains limited. In this study, we investigated bacterial community dynamics, assembly processes, and co-occurrence network patterns in bulk soil, rhizosphere, root endosphere, and leaf endosphere spanning from north to south in the broad-leaved Korean pine forests of northeastern China. Our findings revealed that bacterial composition varied across distribution regions and compartment niches, with diversity also varying among these compartment niches. Deterministic processes predominantly shaped bacterial community assembly across geographic distribution gradients, whereas stochastic processes were more influential in differentiating bacterial communities within specific compartment niches. The co-occurrence network indicated lower stability of bacterial communities at the southernmost site of DD across different geographic distributions and in the leaf endosphere across different compartment niches. Furthermore, the co-occurrence network identified Jatrophihabitans and Betaproteobacteriales as keystone taxa at HH and DD sites, while Aliihoeflea and Actinoplanes were identified in the root endosphere and leaf endosphere, associated with essential functions like carbon metabolism, nitrogen fixation, and pathogen resistance. Source tracking showed bulk soil was the main source of bacterial communities in the rhizosphere, root endosphere, and leaf endosphere. Environmental factors such as soil pH in shaping bacterial community assembly across different geographical areas, while host selection was influential in determining bacterial community assembly within compartment niches. Furthermore, bacterial community similarity and abundance were influenced by environmental factors such as soil pH, total phosphorus, and mean temperature. Overall, the insights gained contribute to a deeper understanding of the relationship between bacterial communities and host plants, carrying important implications for plant conservation and practices related to forest ecosystem functioning.

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环境过滤和宿主选择效应影响韩国松阔叶林中的细菌群落组合:区域尺度研究
在森林生态系统中,细菌群落主要与寄主植物建立共生关系,促进不同空间尺度上的各种生态位。然而,我们对细菌群落在区域分布尺度和宿主不同生态位栖息地内的集结机制的了解仍然有限。在本研究中,我们调查了中国东北朝鲜松阔叶林从北到南的土壤、根瘤层、根系内圈和叶片内圈的细菌群落动态、组装过程和共生网络模式。我们的研究结果表明,细菌的组成在不同的分布区域和区系壁龛之间存在差异,而多样性在这些区系壁龛之间也存在差异。决定性过程主要决定了细菌群落在不同地理分布梯度上的组合,而随机过程对特定区系壁龛内细菌群落的分化影响更大。共现网络表明,在不同的地理分布中,DD 最南端的细菌群落稳定性较低,在不同的区室壁龛中,叶内圈的细菌群落稳定性较低。此外,共现网络还发现 Jatrophihabitans 和 Betaproteobacteriales 是 HH 和 DD 地点的关键类群,而 Aliihoeflea 和 Actinoplanes 则出现在根内层和叶内层,它们与碳代谢、固氮和病原体抵抗等基本功能有关。菌源追踪显示,土壤是根圈、根内圈和叶内圈细菌群落的主要来源。土壤酸碱度等环境因素影响了不同地理区域的细菌群落组合,而宿主选择则决定了区系壁龛内的细菌群落组合。此外,细菌群落的相似性和丰度受土壤 pH 值、总磷和平均温度等环境因素的影响。总之,这些见解有助于加深对细菌群落与寄主植物之间关系的理解,对植物保护和森林生态系统功能相关实践具有重要意义。
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来源期刊
Applied Soil Ecology
Applied Soil Ecology 农林科学-土壤科学
CiteScore
9.70
自引率
4.20%
发文量
363
审稿时长
5.3 months
期刊介绍: Applied Soil Ecology addresses the role of soil organisms and their interactions in relation to: sustainability and productivity, nutrient cycling and other soil processes, the maintenance of soil functions, the impact of human activities on soil ecosystems and bio(techno)logical control of soil-inhabiting pests, diseases and weeds.
期刊最新文献
Editorial Board Influence of land-use type on earthworm diversity and distribution in Yunnan: Insights from soil properties Breeding-induced changes in the rhizosphere microbial communities in Lima bean (Phaseolus lunatus) Corrigendum to “Characteristics of microbial community during the different growth stages of yam (Dioscorea opposita Thunb. cv. Tiegun)” [Appl. Soil Ecol. 201 (2024) 105519] Erratum to “Lack of inhibitory effects of 1-Octyne and PTIO on ammonia oxidizers, nitrite oxidizers, and nitrate formation in acidic paddy soils” [Appl. Soil Ecol. 203 (2024) 105673]
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