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Structure, variation and assembly processes of bacterial communities in different root-associated niches of tomato under periodic drought and nitrogen addition

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Pedosphere 2024年第5期34卷 892-904页

作者： Dan HE Ruifeng GAO Honghong DONG Xiaodi LIU Lijuan REN Qinglong WU Qing YAO Honghui ZHU Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) Key Laboratory of Agricultural Microbiomics and Precision Application (MARA) State Key Laboratory of Applied Microbiology Southern China Institute of Microbiology Guangdong Academy of Sciences College of Plant Protection South China Agricultural University Department of Ecology Institute of Hydrobiology Jinan University College of Horticulture South China Agricultural University

Root-associated bacteria play a vital role in the growth and adaptation of host plants to drought stress. These bacteria can be classified as rhizoplane and rhizosphere bacteria based on their distance from the root surface. Tomato plants are often exposed to periodic drought and nitrogen (N) addition throughout their life cycle, but the impacts of these factors on the plant and root-associated bacteria are not well understood. To gain insight into this relationship, we conducted an experiment to monitor the effects of periodic drought and N addition on rhizoplane and rhizosphere bacteria of tomato plants. Drought and N addition had interactive effects on plant and soil properties, which varied with the timing of drought. There were clear divergences in community traits such as alpha diversity, beta diversity, and network topological features between the two types of bacteria. The rhizoplane bacteria showed lower alpha diversity but higher beta diversity and were more sensitive to drought and N addition than the rhizosphere bacteria. Nitrogen addition could downsize the effects of drought on rhizoplane bacterial community compositions. The higher proximity to the root might induce a community to develop more cooperation between different members to cope with plant metabolites, as revealed by the more connected and modularized community network of the rhizoplane bacteria. Drought at the seedling stage had great legacy effects on plant and soil properties. It may enhance selection, cause the dominance of deterministic processes in the assembly of rhizoplane bacteria, and reduce bacterial community network complexity. In conclusion, N addition could interact with drought in affecting tomato plants and their root-associated bacteria, depending on the timing of drought and the fineness of root niches. The higher sensitivity of rhizoplane bacteria to drought and N addition calls for more research due to their higher proximity and importance to plants in future environment

关键词： alpha and beta diversity drought stress node-level network feature rhizoplane bacteria rhizosphere bacteria species co-occurrence network

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Taxonomic, functional, and phylogenetic diversity patterns reveal different processes shaping river fish assemblages in the Eastern Huai River Basin, China

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Water Biology and Security 2023年第1期2卷 9-18页

作者： Han Liu Xiao Qu Wentong Xia Yushun Chen State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan430072China University of Chinese Academy of Sciences Beijing100049China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikou570228China Huai'an Research Center Institute of HydrobiologyChinese Academy of SciencesHuai'an223001China Basin Water Environmental Research Department Changjiang River Scientific Research InstituteWuhan430010China

Understanding contributions of different environmental drivers to the structure and function of river biota is critical for biodiversity and environmental ***,there is no consensus on which drivers have the greatest impact on fish diversity,especially in watersheds disturbed by multiple human *** taxonomic,phylogenetic,and functional diversity at both alpha and beta dimensions and their environmental drivers were studied in a total of 84 river sites from three watersheds,Huai River watershed(HRW),Sui River watershed(SRW),and Yishusi River watershed(YRW)in the Eastern Huai River Basin of *** showed that rivers in the three watersheds had no significant difference in both taxonomic and functional alpha *** in the HRW had significantly higher phylogenetic alpha *** taxonomic and phylogenetic beta diversity,the overall beta diversity and turnover component were significant higher in the *** functional beta diversity,the overall beta diversity was significantly lower in the *** linear regression(MLR)and redundancy analysis(RDA)showed that local(e.g.,nutrients,dissolved oxygen,river width,transparency),regional(e.g.,wetland),climate(e.g.,temperature),and spatial variables structured alpha and beta fish *** partitioning analysis indicated that the pure contributions of local and spatial variables were more important than that of climate and regional variables,which suggested that spatial effects and local environmental filtering were the main factors driving the beta diversity of fish assemblages in these *** current study highlights the importance of considering multidimensional diversity and multiple environmental factors for conserving river fishes.

关键词： Fish assemblages alpha and beta diversity Multifaceted diversity Variance partitioning Stochastic and deterministic processes Ecological conservation

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