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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 diversity beta diversity co-occurrence network community composition drought stress node-level network feature rhizoplane bacteria rhizosphere bacteria

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Vermicompost and Cow Dung Admixture Increases rhizosphere bacterial Population and Promotes Rapid Physiological Maturity in Maize (Zea mays L.)

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NASS Journal of Agricultural Sciences 2019年第2期1卷 27-36页

作者： Priya Chatterjee Paramita Mandal Sudipto Mandal Soumendranath Chatterjee Department of Zoology The University of BurdwanBurdwan713104India Ecology and Environmental Modelling Laboratory Department of Environmental ScienceThe University of BurdwanBurdwan713104India Parasitology and Microbiology Research Laboratory Department of ZoologyThe University of BurdwanBurdwan713104India

Incessant application of chemical fertilizers to the agricultural fields may alter the composition and activities of soil ***,the shift of cultivation practices from chemical to organic is considered to be the need of the hour in order to maintain soil health.A study was conducted in the agricultural fields of the University of Burdwan,India to observe the impact of organic manure on the rhizosphere bacterial *** experiments were conducted on maize plants,supplemented with the recommended dose of chemical fertilizer and organic manure(vermicompost and cow dung mixture).Corresponding changes in the plant phenological events and soil health in terms of soil physico-chemical factors and rhizosphere bacterial groups up to the level of CFU g-1×105 dry soil was *** results showed a significant increase in population of phosphate solubilizing bacteria during ***,at 90 DAS,significant increase in the population of phosphate solubilizing bacteria,nitrifying bacteria,asymbiotic nitrogen-fixing bacteria and protein hydrolyzing bacteria was observed in the organically treated *** growth of rhizosphere bacteria was attributed to the type of organic manure supplied to the agricultural *** addition,a strong correlation was observed between Zn and protein hydrolyzing *** soil organic carbon and available nitrogen were strongly correlated with nitrifying,fat solubilizing and phosphate solubilizing groups of bacteria.

关键词： Chemical fertilizer Organic manure Phenological events Physico-chemical factors rhizosphere bacteria

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Suppression of clubroot by Bacillus velezensis Pla6 via antibiosis and promoting growth of cabbages

Suppression of clubroot by Bacillus velezensis Pla6 via anti...

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中国植物病理学会2021年学术年会

作者：贾瑞敏 WANG Hua XIAO Keyu CHEN Jing ZHANG Jing ZONG Zhaofeng 王阳 College of Plant Protection Northwest Agriculture &Forestry University Department of Agri-Food Sciences and Technologies School of AgricultureUniversity of Bologna

Clubroot is a serious threat to cabbage production in China,while beneficial rhizosphere bacteria were considered excellent candidates as biocontrol *** this study,the cabbage rhizosphere bacterium Pla6 was evaluated for the potential of cabbage pathogens inhibition and *** Pla6 protected cabbage from clubroot under greenhouse and field conditions,with a biocontrol efficacy of 74.07% and 62.25%,respectively,and it showed pronounced inhibition on the germination and survival of *** resting spores（RS）.The biosynthesis gene clusters in Pla6 indicated that it is capable of producing bacillibactin,bacilysin,macrolactin and ***,the macrolide antibioticmacrolactin A was obtained by the targeted isolation,purification and identification of the active ingredients,which was able to inhibit the activity of RS and cause spores ***,the plant biomass were enhanced for greenhouse-grown cabbages with Pla6,and inoculation with Pla6 increased the plant photosyntheticefficiency without Pla6 as well as *** infected *** exhibited several growth-promoting related features including phosphate solubilization,siderophore production and improvement in cabbage leaves *** findings suggested that Pla6 could be a potential biocontrol agent for the management of clubroot and a source of antimicrobial.

关键词： Plasmodiophora brassicae Biological control rhizosphere bacteria MacrolactinA

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