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Liu Z, Xia Q, Cai J, Wang Z, Yang K, Chen D, Wei J, Chen C, Liu C, Chang W, Li Z, Li X, Yang Y, Yang L, Tan X. Nitrogen Fertilizers Affect Microbial Hitchhiking to the Plant Roots. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:4639-4648. [PMID: 38377485 DOI: 10.1021/acs.jafc.3c07623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
The phenomenon of microbial hitchhiking, where nonmotile microbes utilize transspecies motility to navigate within their environment, has been observed. However, the underlying factors driving microbial hitchhiking remain unclear. Our study explored how nitrogen fertilizers affect microbial hitchhiking in soil through an in situ planting experiment. We established twelve treatments encompassing the presence and absence of plants, the presence and absence of a filter membrane that is used to prevent hitchhiking, and three nitrogen levels. Results showed that nitrogen influenced bacterial diversity in all soils, an effect thwarted by filter membranes. In the presence of plants, nitrogen significantly affected the bacterial mobility, Bacillus abundance, and plant biomass, but these effects vanished when filters were used. The correlation between motile Bacillus and rhizosphere bacteria was strong without filters at the proper nitrogen levels but weakened with membrane treatments. Thus, plants and nitrogen together, not nitrogen alone, alter the soil microbiome via hitchhiking.
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Affiliation(s)
- Zhibin Liu
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China
| | - Qini Xia
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China
| | - Jing Cai
- West China School of Pharmacy, Sichuan University, Chengdu, Sichuan 610041, China
| | - Ziyuan Wang
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China
| | - Kexin Yang
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China
| | - Dixu Chen
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China
| | - Jiahong Wei
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China
| | - Cun Chen
- College of Chemistry and Life Science, Chengdu Normal University, Chengdu, Sichuan 611130, China
| | - Chao Liu
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China
- College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China
| | - Wei Chang
- Vegetable Germplasm Innovation and Variety Improvement Key Laboratory of Sichuan Province/Horticulture Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China
| | - Zhi Li
- Vegetable Germplasm Innovation and Variety Improvement Key Laboratory of Sichuan Province/Horticulture Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China
| | - Xufeng Li
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China
| | - Yi Yang
- Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, Sichuan 610064, China
| | - Liang Yang
- Vegetable Germplasm Innovation and Variety Improvement Key Laboratory of Sichuan Province/Horticulture Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China
| | - Xiao Tan
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China
- College of Water Resource and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China
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Wallace M, Cummings, Jr. DA, Roberts AG, Puri AW. A widespread methylotroph acyl-homoserine lactone synthase produces a new quorum sensing signal that regulates swarming in Methylobacterium fujisawaense. mBio 2024; 15:e0199923. [PMID: 38085021 PMCID: PMC10790750 DOI: 10.1128/mbio.01999-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 10/31/2023] [Indexed: 01/17/2024] Open
Abstract
IMPORTANCE Bacteria known as pink-pigmented facultative methylotrophs colonize many diverse environments on earth, play an important role in the carbon cycle, and in some cases promote plant growth. However, little is known about how these organisms interact with each other and their environment. In this work, we identify one of the chemical signals commonly used by these bacteria and discover that this signal controls swarming motility in the pink-pigmented facultative methylotroph Methylobacterium fujisawaense DSM5686. This work provides new molecular details about interactions between these important bacteria and will help scientists predict these interactions and the group behaviors they regulate from genomic sequencing information.
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Affiliation(s)
- Mike Wallace
- Department of Chemistry, University of Utah, Salt Lake City, Utah, USA
- Henry Eyring Center for Cell and Genome Science, University of Utah, Salt Lake City, Utah, USA
| | - Dale A. Cummings, Jr.
- Department of Chemistry, University of Utah, Salt Lake City, Utah, USA
- Henry Eyring Center for Cell and Genome Science, University of Utah, Salt Lake City, Utah, USA
| | - Andrew G. Roberts
- Department of Chemistry, University of Utah, Salt Lake City, Utah, USA
| | - Aaron W. Puri
- Department of Chemistry, University of Utah, Salt Lake City, Utah, USA
- Henry Eyring Center for Cell and Genome Science, University of Utah, Salt Lake City, Utah, USA
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Carratalà A, Chappelier C, Selmoni O, Guillaume AS, Chmiel HE, Pasche N, Weil C, Kohn T, Joost S. Vertical distribution and seasonal dynamics of planktonic cyanobacteria communities in a water column of deep mesotrophic Lake Geneva. Front Microbiol 2023; 14:1295193. [PMID: 38169808 PMCID: PMC10758419 DOI: 10.3389/fmicb.2023.1295193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 11/28/2023] [Indexed: 01/05/2024] Open
Abstract
Background Temperate subalpine lakes recovering from eutrophication in central Europe are experiencing harmful blooms due to the proliferation of Planktothrix rubescens, a potentially toxic cyanobacteria. To optimize the management of cyanobacteria blooms there is the need to better comprehend the combination of factors influencing the diversity and dominance of cyanobacteria and their impact on the lake's ecology. The goal of this study was to characterize the diversity and seasonal dynamics of cyanobacteria communities found in a water column of Lake Geneva, as well as the associated changes on bacterioplankton abundance and composition. Methods We used 16S rRNA amplicon high throughput sequencing on more than 200 water samples collected from surface to 100 meters deep monthly over 18 months. Bacterioplankton abundance was determined by quantitative PCR and PICRUSt predictions were used to explore the functional pathways present in the community and to calculate functional diversity indices. Results The obtained results confirmed that the most dominant cyanobacteria in Lake Geneva during autumn and winter was Planktothrix (corresponding to P. rubescens). Our data also showed an unexpectedly high relative abundance of picocyanobacterial genus Cyanobium, particularly during summertime. Multidimensional scaling of Bray Curtis dissimilarity revealed that the dominance of P. rubescens was coincident with a shift in the bacterioplankton community composition and a significant decline in bacterioplankton abundance, as well as a temporary reduction in the taxonomic and PICRUSt2 predicted functional diversity. Conclusion Overall, this study expands our fundamental understanding of the seasonal dynamics of cyanobacteria communities along a vertical column in Lake Geneva and the ecology of P. rubescens, ultimately contributing to improve our preparedness against the potential occurrence of toxic blooms in the largest lake of western Europe.
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Affiliation(s)
- Anna Carratalà
- Environmental Chemistry Laboratory, ENAC, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Coralie Chappelier
- Environmental Chemistry Laboratory, ENAC, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Oliver Selmoni
- Department of Embryology, Department of Plant Biology, Carnegie Institution for Science, Washington, DC, United States
- Laboratory for Biological Geochemistry (LGB), Geospatial Molecular Epidemiology Group (GEOME), ENAC Faculty, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Annie S. Guillaume
- Laboratory for Biological Geochemistry (LGB), Geospatial Molecular Epidemiology Group (GEOME), ENAC Faculty, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Hannah E. Chmiel
- Eusserthal Ecosystem Research Station (EERES), Institute for Environmental Sciences (iES), University of Kaiserslautern-Landau, Landau, Germany
- Limnology Center, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Natacha Pasche
- Limnology Center, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Charlotte Weil
- ENAC-IT4R, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Tamar Kohn
- Environmental Chemistry Laboratory, ENAC, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Stéphane Joost
- Laboratory for Biological Geochemistry (LGB), Geospatial Molecular Epidemiology Group (GEOME), ENAC Faculty, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
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Unchartered waters: the unintended impacts of residual chlorine on water quality and biofilms. NPJ Biofilms Microbiomes 2020; 6:34. [PMID: 32978404 PMCID: PMC7519676 DOI: 10.1038/s41522-020-00144-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 08/25/2020] [Indexed: 02/08/2023] Open
Abstract
Disinfection residuals in drinking water protect water quality and public heath by limiting planktonic microbial regrowth during distribution. However, we do not consider the consequences and selective pressures of such residuals on the ubiquitous biofilms that persist on the vast internal surface area of drinking water distribution systems. Using a full scale experimental facility, integrated analyses were applied to determine the physical, chemical and biological impacts of different free chlorine regimes on biofilm characteristics (composition, structure and microbiome) and water quality. Unexpectedly, higher free chlorine concentrations resulted in greater water quality degredation, observable as elevated inorganic loading and greater discolouration (a major cause of water quality complaints and a mask for other failures). High-chlorine concentrations also reduced biofilm cell concentrations but selected for a distinct biofilm bacterial community and inorganic composition, presenting unique risks. The results challenge the assumption that a measurable free chlorine residual necessarily assures drinking water safety.
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Yu Z, Tian R, Liu D, Zhang Y, Li H. Aggregation kinetics of binary systems containing kaolinite and Pseudomonas putida induced by different 1:1 electrolytes: specific ion effects. PEERJ PHYSICAL CHEMISTRY 2020. [DOI: 10.7717/peerj-pchem.12] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Background
The interactions between colloidal particles in the binary systems or mixture colloids containing clay minerals and bacteria have important influences on formations and stabilities of soil aggregates, transportations of soil water, as well as biological activities of microorganisms. How the interfacial reaction of metal ions affects their interaction therefore becomes an important scientific issue.
Methods
Dynamic light scattering studies on the aggregation kinetics of mixture colloids containing kaolinite and Pseudomonas putida (P. putida) were conducted in this study.
Results
Aggregation could be observed between kaolinite and kaolinite, between kaolinite and P. putida when P. putida content was less than 33.3%. Additionally, aggregation rates decreased with increasing P. putida content. The critical coagulation concentrations and activation energies indicated that there were strong specific ion effects on the aggregation of mixture colloids. Most importantly, the activation energy increased sharply with increasing P. putida content, which might result from the lower Hamaker constant of P. putida compared with that of kaolinite.
Contributions
(1) Strong specific ion effects on mixture colloids aggregation of kaolinite-P. putida were observed; (2) the aggregation behavior of mixture colloids was determined by the average effects of mixture colloids, rather than the specific component. This finding provides an important methodological guide for further studies on the colloidal aggregation behavior of mixture systems with organic and inorganic materials.
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Affiliation(s)
- Zhaoxuan Yu
- Key Laboratory of Soil Multi-Scale Interfacial Process, College of Resource and Environment, Southwest University, Chongqing, China
| | - Rui Tian
- Key Laboratory of Soil Multi-Scale Interfacial Process, College of Resource and Environment, Southwest University, Chongqing, China
| | - Dian Liu
- Key Laboratory of Soil Multi-Scale Interfacial Process, College of Resource and Environment, Southwest University, Chongqing, China
| | - Yekun Zhang
- Key Laboratory of Soil Multi-Scale Interfacial Process, College of Resource and Environment, Southwest University, Chongqing, China
| | - Hang Li
- Key Laboratory of Soil Multi-Scale Interfacial Process, College of Resource and Environment, Southwest University, Chongqing, China
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