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Pilkington LI, Kerner W, Bertoldi D, Larcher R, Lee SA, Goddard MR, Albanese D, Franceschi P, Fedrizzi B. Integration and holistic analysis of multiple multidimensional soil data sets. Talanta 2024; 274:125954. [PMID: 38599113 DOI: 10.1016/j.talanta.2024.125954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 03/09/2024] [Accepted: 03/18/2024] [Indexed: 04/12/2024]
Abstract
Complex matrices such as soil have a range of measurable characteristics, and thus data to describe them can be considered multidimensional. These characteristics can be strongly influenced by factors that introduce confounding effects that hinder analyses. Traditional statistical approaches lack the flexibility and granularity required to adequately evaluate such matrices, particularly those with large dataset of varying data types (i.e. quantitative non-compositional, quantitative compositional). We present a statistical workflow designed to effectively analyse complex, multidimensional systems, even in the presence of confounding variables. The developed methodology involves exploratory analysis to identify the presence of confounding variables, followed by data decomposition (including strategies for both compositional and non-compositional quantitative data) to minimise the influence of these confounding factors such as sampling site/location. These data processing methods then allow for common patterns to be highlighted in the data, including the identification of biomarkers and determination of non-trivial associations between variables. We demonstrate the utility of this statistical workflow by jointly analysing the chemical composition and fungal biodiversity of New Zealand vineyard soils that have been managed with either organic low-input or conventional input approaches. By applying this pipeline, we were able to identify biomarkers that distinguish viticultural soil from both approaches and also unearth links and associations between the chemical and metagenomic profiles. While soil is an example of a system that can require this type of statistical methodology, there are a range of biological and ecological systems that are challenging to analyse due to the complex interplay of global and local effects. Utilising our developed pipeline will greatly enhance the way that these systems can be studied and the quality and impact of insight gained from their analysis.
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Affiliation(s)
- Lisa I Pilkington
- School of Chemical Sciences, University of Auckland, Auckland, 1010, New Zealand; Te Pūnaha Matatini, Auckland, 1142, New Zealand.
| | - William Kerner
- School of Chemical Sciences, University of Auckland, Auckland, 1010, New Zealand
| | - Daniela Bertoldi
- Food Characterisation and Processing Department, Technology Transfer Centre, Fondazione Edmund Mach, San Michele all'Adige, 38098, Italy
| | - Roberto Larcher
- Food Characterisation and Processing Department, Technology Transfer Centre, Fondazione Edmund Mach, San Michele all'Adige, 38098, Italy
| | - Soon A Lee
- School of Biological Sciences, University of Auckland, Auckland, 1010, New Zealand
| | - Matthew R Goddard
- School of Biological Sciences, University of Auckland, Auckland, 1010, New Zealand; School of Life and Environmental Sciences, Joseph Banks Laboratories, University of Lincoln, LN6 7DL, UK
| | - Davide Albanese
- Unit of Computational Biology, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, 38098, Italy
| | - Pietro Franceschi
- Unit of Computational Biology, Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, 38098, Italy.
| | - Bruno Fedrizzi
- School of Chemical Sciences, University of Auckland, Auckland, 1010, New Zealand.
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Fiore-Donno AM, Freudenthal J, Dahl MB, Rixen C, Urich T, Bonkowski M. Biotic interactions explain seasonal dynamics of the alpine soil microbiome. ISME COMMUNICATIONS 2024; 4:ycae028. [PMID: 38500704 PMCID: PMC10945362 DOI: 10.1093/ismeco/ycae028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 01/24/2024] [Accepted: 02/22/2024] [Indexed: 03/20/2024]
Abstract
While it is acknowledged that alpine soil bacterial communities are primarily driven by season and elevation, there is no consensus on the factors influencing fungi and protists. Here we used a holistic approach of the microbiome to investigate the seasonal dynamics in alpine grasslands, focusing on soil food web interactions. We collected 158 soil samples along elevation transects from three mountains in the Alps, in spring during snowmelt and in the following summer. Using metatranscriptomics, we simultaneously assessed prokaryotic and eukaryotic communities, further classified into trophic guilds. Our findings reveal that the consumers' pressure increases from spring to summer, leading to more diverse and evenly distributed prey communities. Consequently, consumers effectively maintain the diverse soil bacterial and fungal communities essential for ecosystem functioning. Our research highlights the significance of biotic interactions in understanding the distribution and dynamics of alpine microbial communities.
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Affiliation(s)
- Anna Maria Fiore-Donno
- Institute of Zoology, University of Cologne, Zuelpicher Str. 47b, 50674 Cologne, Germany
| | - Jule Freudenthal
- Institute of Zoology, University of Cologne, Zuelpicher Str. 47b, 50674 Cologne, Germany
| | - Mathilde Borg Dahl
- Institute of Microbiology, University of Greifswald, 17489 Greifswald, Germany
| | - Christian Rixen
- WSL Institute for Snow and Avalanche Research SLF, 7260 Davos Dorf, Switzerland
- Climate Change, Extremes and Natural Hazards in Alpine Regions Research Centre CERC, 7260 Davos Dorf, Switzerland
| | - Tim Urich
- Institute of Microbiology, University of Greifswald, 17489 Greifswald, Germany
| | - Michael Bonkowski
- Institute of Zoology, University of Cologne, Zuelpicher Str. 47b, 50674 Cologne, Germany
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Beriot N, Zornoza R, Lwanga EH, Zomer P, van Schothorst B, Ozbolat O, Lloret E, Ortega R, Miralles I, Harkes P, van Steenbrugge J, Geissen V. Intensive vegetable production under plastic mulch: A field study on soil plastic and pesticide residues and their effects on the soil microbiome. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 900:165179. [PMID: 37385505 DOI: 10.1016/j.scitotenv.2023.165179] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 06/25/2023] [Accepted: 06/26/2023] [Indexed: 07/01/2023]
Abstract
Intensive agriculture relies on external inputs to reach high productivity and profitability. Plastic mulch, mainly in the form of Low-Density Polyethylene (LDPE), is widely used in agriculture to decrease evaporation, increase soil temperature and prevent weeds. The incomplete removal of LDPE mulch after use causes plastic contamination in agricultural soils. In conventional agriculture, the use of pesticides also leaves residues accumulating in soils. Thus, the objective of this study was to measure plastic and pesticide residues in agricultural soils and their effects on the soil microbiome. For this, we sampled soil (0-10 cm and 10-30 cm) from 18 parcels from 6 vegetable farms in SE Spain. The farms were under either organic or conventional management, where plastic mulch had been used for >25 years. We measured the macro- and micro-light density plastic debris contents, the pesticide residue levels, and a range of physiochemical properties. We also carried out DNA sequencing on the soil fungal and bacterial communities. Plastic debris (>100 μm) was found in all samples with an average number of 2 × 103 particles kg-1 and area of 60 cm2 kg-1. We found 4-10 different pesticide residues in all conventional soils, for an average of 140 μg kg-1. Overall, pesticide content was ∼100 times lower in organic farms. The soil microbiomes were farm-specific and related to different soil physicochemical parameters and contaminants. Regarding contaminants, bacterial communities responded to the total pesticide residues, the fungicide Azoxystrobin and the insecticide Chlorantraniliprole as well as the plastic area. The fungicide Boscalid was the only contaminant to influence the fungal community. The wide spread of plastic and pesticide residues in agricultural soil and their effects on soil microbial communities may impact crop production and other environmental services. More studies are required to evaluate the total costs of intensive agriculture.
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Affiliation(s)
- Nicolas Beriot
- Soil Physics and Land Management Group, Wageningen University & Research, Droevendaalsesteeg 4, 6708 PB Wageningen, the Netherlands; Sustainable Use, Management and Reclamation of Soil and Water Research Group, Department of Agricultural Engineering, Universidad Politécnica de Cartagena, Paseo Alfonso XIII, 48, 30203 Cartagena, Spain
| | - Raúl Zornoza
- Sustainable Use, Management and Reclamation of Soil and Water Research Group, Department of Agricultural Engineering, Universidad Politécnica de Cartagena, Paseo Alfonso XIII, 48, 30203 Cartagena, Spain
| | - Esperanza Huerta Lwanga
- Soil Physics and Land Management Group, Wageningen University & Research, Droevendaalsesteeg 4, 6708 PB Wageningen, the Netherlands; Agroecologia, El Colegio de la Frontera Sur, Unidad Campeche, Mexico
| | - Paul Zomer
- Wageningen Food Safety Research, PO. Box 230, 6700 AE Wageningen, the Netherlands
| | - Benjamin van Schothorst
- Soil Physics and Land Management Group, Wageningen University & Research, Droevendaalsesteeg 4, 6708 PB Wageningen, the Netherlands
| | - Onurcan Ozbolat
- Sustainable Use, Management and Reclamation of Soil and Water Research Group, Department of Agricultural Engineering, Universidad Politécnica de Cartagena, Paseo Alfonso XIII, 48, 30203 Cartagena, Spain
| | - Eva Lloret
- Sustainable Use, Management and Reclamation of Soil and Water Research Group, Department of Agricultural Engineering, Universidad Politécnica de Cartagena, Paseo Alfonso XIII, 48, 30203 Cartagena, Spain
| | - Raúl Ortega
- Department of Agronomy & Center for Intensive Mediterranean Agrosystems and Agri-food Biotechnology (CIAIMBITAL), University of Almeria, E-04120 Almería, Spain
| | - Isabel Miralles
- Department of Agronomy & Center for Intensive Mediterranean Agrosystems and Agri-food Biotechnology (CIAIMBITAL), University of Almeria, E-04120 Almería, Spain
| | - Paula Harkes
- Soil Physics and Land Management Group, Wageningen University & Research, Droevendaalsesteeg 4, 6708 PB Wageningen, the Netherlands
| | - Joris van Steenbrugge
- Laboratory of Nematology, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, the Netherlands
| | - Violette Geissen
- Soil Physics and Land Management Group, Wageningen University & Research, Droevendaalsesteeg 4, 6708 PB Wageningen, the Netherlands
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Naumova NB, Barsukov PA, Baturina OA, Kabilov MR. Soil Alveolata diversity in the undisturbed steppe and wheat agrocenoses under different tillage. Vavilovskii Zhurnal Genet Selektsii 2023; 27:703-711. [PMID: 38023813 PMCID: PMC10643539 DOI: 10.18699/vjgb-23-81] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 08/03/2023] [Accepted: 08/07/2023] [Indexed: 12/01/2023] Open
Abstract
Microeukaryotes are vital for maintaining soil quality and ecosystem functioning, however, their communities are less studied than bacterial and fungal ones, especially by high throughput sequencing techniques. Alveolates are important members of soil microbial communities, being consumers and/or prey for other microorganisms. We studied alveolate diversity in soil under the undisturbed steppe (US) and cropped for wheat using two tillage practices (conventional, CT, and no-till, NT) by amplifying the ITS2 marker with ITS3_KYO2/ITS4 primers and sequencing amplicons using Illumina MiSeq. A total of 198 Alveolata OTUs were identified, with 158 OTUs attributed to the Ciliophora phylum, containing five classes: Litostomatea, Spirotrichea and Oligohymenophorea, Nassophorea and Phyllopharyngea. Litostomatea and Phyllopharyngea were more abundant in US as compared with CT and NT. The observed OTU richness was higher in US than in CT and NT. The β-biodiversity of soil ciliates also very distinctly differentiated the US field from CT and NT. In the US, Nassophorea and Spirotrichea correlated positively with sand and negatively with clay, silt and SOM contents. This is the first report about soil ciliates diversity in Siberia as assessed by metabarcoding technique. The revealed clear effect of land use on the relative abundance of some taxa and a lack of tillage effect suggest the importance of the quantity and quality of plant material input for shaping the prey for ciliates. The ITS-metabarcoding technique was used for the first time in the research of ciliates diversity; further studies, embracing diverse aspects of soil ciliates by combining -omics methodology with the traditional one, are needed to get a better insight on the ecological roles of the main ciliate taxa in the complex soil system.
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Affiliation(s)
- N B Naumova
- Institute of Soil Science and Agrochemistry of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - P A Barsukov
- Institute of Soil Science and Agrochemistry of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - O A Baturina
- Institute of Soil Science and Agrochemistry of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - M R Kabilov
- Institute of Chemical Biology and Fundamental Medicine of the Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
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Sikora RA, Helder J, Molendijk LPG, Desaeger J, Eves-van den Akker S, Mahlein AK. Integrated Nematode Management in a World in Transition: Constraints, Policy, Processes, and Technologies for the Future. ANNUAL REVIEW OF PHYTOPATHOLOGY 2023; 61:209-230. [PMID: 37186900 DOI: 10.1146/annurev-phyto-021622-113058] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Plant-parasitic nematodes are one of the most insidious pests limiting agricultural production, parasitizing mostly belowground and occasionally aboveground plant parts. They are an important and underestimated component of the estimated 30% yield loss inflicted on crops globally by biotic constraints. Nematode damage is intensified by interactions with biotic and abiotic factors constraints: soilborne pathogens, soil fertility degradation, reduced soil biodiversity, climate variability, and policies influencing the development of improved management options. This review focuses on the following topics: (a) biotic and abiotic constraints, (b) modification of production systems, (c) agricultural policies, (d) the microbiome, (e) genetic solutions, and (f) remote sensing. Improving integrated nematode management (INM) across all scales of agricultural production and along the Global North-Global South divide, where inequalities influence access to technology, is discussed. The importance of the integration of technological development in INM is critical to improving food security and human well-being in the future.
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Affiliation(s)
| | - Johannes Helder
- Laboratory of Nematology, Department of Plant Sciences, Wageningen University, Wageningen, The Netherlands
| | | | - Johan Desaeger
- Institute of Food and Agricultural Sciences, Department of Entomology and Nematology, Gulf Coast Research and Education Center, University of Florida, Wimauma, Florida, USA
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Singh I, Hussain M, Manjunath G, Chandra N, Ravikanth G. Regenerative agriculture augments bacterial community structure for a healthier soil and agriculture. FRONTIERS IN AGRONOMY 2023; 5:1134514. [PMID: 39071943 PMCID: PMC7616306 DOI: 10.3389/fagro.2023.1134514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 07/30/2024]
Abstract
Introduction Use of chemical fertilization and pesticides not only harm the environment but also have detrimental consequences on human health. In recent years, there has been a major emphasis worldwide on natural agriculture methods. Regenerative agriculture is known across the world as a combination of nature-friendly farming practices such as no-till, cover cropping, crop-rotation, agroforestry and use of organic home-based/farm-based ingredients to revive soil health. In India, a number of farmers are slowly adopting these practices using home-based mixtures and farmyard manure for soil rejuvenation and pest management. In order to evaluate the efficacy of the regenerative agriculture practices, this study compared conventional and regenerative agriculture plots for their soil bacterial and nutrient profiles. Methods Two crops - ragi (Finger millet, an old world cereal eaten in India) and vegetable (tomato/beans), and different lengths (≤3 and >5 years) of regenerative practices were additional metrics considered to understand variabilities due to crop-type and period of application. The common regenerative agriculture practices used by farmers in this study included a mix of practices such as mulching, minimal-till, inter-cropping, crop-rotation, along with application of farmyard manure and other home-based concoctions rich in nutrients and microbes for enriching the soil. Results We found that all regenerative practices were effective in bringing about an enrichment for soil bacteria with a more heterogeneous composition. Additionally, in regenerative vegetable (RV) versus conventional vegetable (CV) and barren land (BL) plots the relative percentage abundance of Actinobacteriota (RV-7.47%/ CV-6.24%/BL -7.02%) and Chloroflexi (RV-9.37%/ CV-6.63%/BL-8.75%) was slightly higher. In contrast, levels of Acidobacteriota (RV-8.1%/ CV-9.88%/BL-9.62%) was significantly lower. Similarly, regenerative ragi (RR) in comparison with conventional ragi (CR) and barren land (BL) plots saw higher representation of Firmicutes (RR-5.45%/ CR-2.38%/BL-1.45%) and Actinobacteriota (RR-11.53%/ CR-7.08%/BL-7.15%) and a concurrent reduction in Acidobacteriota (RR-6.91%/CR-7.39%/ BL-9.79%). The RV plots were found to be enriched for Plant Growth Promoting Rhizobacteria (PGPRs) - Pseudomonas sp. (RV-0.51%/CV-0.01%/BL-0.21%), and RR plots were enriched for Bacillus sp. (RR-1.35%/CR-0.95%/BL-0.61%), and Mesorhizobium sp. (0.30%/0.12%/0.21%), which are known to play significant roles in vegetable and ragi growth respectively. Discussion Interestingly, long-term regenerative agriculture was able to support good nutrient composition while enhancing Soil Organic Carbon (SOC) levels. In all, the regenerative agriculture practices were found to be effective in improving bacterial community structure and simultaneously improving soil health. We found that BL soil with eucalyptus plantation showed among the least bacterial diversity suggesting detrimental impact on soil health.
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Affiliation(s)
- Indira Singh
- Ashoka Trust for Research in Ecology and the Environment, Bangalore, India
| | | | - G. Manjunath
- Ashoka Trust for Research in Ecology and the Environment, Bangalore, India
| | | | - G. Ravikanth
- Ashoka Trust for Research in Ecology and the Environment, Bangalore, India
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Panico SC, van Gestel CAM, Verweij RA, Rault M, Bertrand C, Menacho Barriga CA, Coeurdassier M, Fritsch C, Gimbert F, Pelosi C. Field mixtures of currently used pesticides in agricultural soil pose a risk to soil invertebrates. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 305:119290. [PMID: 35436506 DOI: 10.1016/j.envpol.2022.119290] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 03/17/2022] [Accepted: 04/08/2022] [Indexed: 06/14/2023]
Abstract
Massive use of pesticides in conventional agriculture leads to accumulation in soil of complex mixtures, triggering questions about their potential ecotoxicological risk. This study assessed cropland soils containing pesticide mixtures sampled from conventional and organic farming systems at La Cage and Mons, France. The conventional agricultural field soils contained more pesticide residues (11 and 17 versus 3 and 11, respectively) and at higher concentrations than soils from organic fields (mean 6.6 and 10.5 versus 0.2 and 0.6 μg kg-1, respectively), including systemic insecticides belonging to neonicotinoids, carbamate herbicides and broad-spectrum fungicides mostly from the azole family. A risk quotient (RQi) approach evaluated the toxicity of the pesticide mixtures in soil, assuming concentration addition. Based on measured concentrations, both conventional agricultural soils posed high risks to soil invertebrates, especially due to the presence of epoxiconazole and imidacloprid, whereas soils under organic farming showed negligible to medium risk. To confirm the outcome of the risk assessment, toxicity of the soils was determined in bioassays following standardized test guidelines with seven representative non-target invertebrates: earthworms (Eisenia andrei, Lumbricus rubellus, Aporrectodea caliginosa), enchytraeids (Enchytraeus crypticus), Collembola (Folsomia candida), oribatid mites (Oppia nitens), and snails (Cantareus aspersus). Collembola and enchytraeid survival and reproduction and land snail growth were significantly lower in soils from conventional compared to organic agriculture. The earthworms displayed different responses: L. rubellus showed higher mortality on soils from conventional agriculture and large body mass loss in all field soils, E. andrei showed considerable mass loss and strongly reduced reproduction, and A. caliginosa showed significantly reduced acetylcholinesterase activity in soils from conventional agriculture. The oribatid mites did not show consistent differences between organic and conventional farming soils. These results highlight that conventional agricultural practices pose a high risk for soil invertebrates and may threaten soil functionality, likely due to additive or synergistic "cocktail effects".
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Affiliation(s)
- Speranza C Panico
- Department of Ecological Science, Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081, HV, Amsterdam, the Netherlands; Department of Biology, University of Naples Federico II, Via Cinthia, 80126, Naples, Italy
| | - Cornelis A M van Gestel
- Department of Ecological Science, Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081, HV, Amsterdam, the Netherlands.
| | - Rudo A Verweij
- Department of Ecological Science, Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081, HV, Amsterdam, the Netherlands
| | - Magali Rault
- Univ Avignon, Aix Marseille Univ, CNRS, IRD, IMBE, Pôle Agrosciences, 301 rue Baruch de Spinoza, BP 21239, 84916, Avignon, France
| | - Colette Bertrand
- UMR 1402 ECOSYS, INRAe, AgroParisTech, Université Paris-Saclay, 78026, Versailles, France
| | - Carlos A Menacho Barriga
- UMR 6249 Chrono-environnement CNRS - Université de Franche-Comté Usc INRAe, 16 route de Gray, 25030, Besançon, cedex, France
| | - Michaël Coeurdassier
- UMR 6249 Chrono-environnement CNRS - Université de Franche-Comté Usc INRAe, 16 route de Gray, 25030, Besançon, cedex, France
| | - Clémentine Fritsch
- UMR 6249 Chrono-environnement CNRS - Université de Franche-Comté Usc INRAe, 16 route de Gray, 25030, Besançon, cedex, France
| | - Frédéric Gimbert
- UMR 6249 Chrono-environnement CNRS - Université de Franche-Comté Usc INRAe, 16 route de Gray, 25030, Besançon, cedex, France
| | - Céline Pelosi
- UMR 1114 EMMAH, INRAe, Avignon Université, 84914, Avignon, France
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Liu Y, Li D, Gao H, Li Y, Chen W, Jiao S, Wei G. Regulation of soil micro-foodwebs to root secondary metabolites in cultivated and wild licorice plants. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 828:154302. [PMID: 35276159 DOI: 10.1016/j.scitotenv.2022.154302] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 02/27/2022] [Accepted: 02/28/2022] [Indexed: 06/14/2023]
Abstract
The diversity of soil eukaryotes and micro-foodwebs are only partially understood. Moreover, how they affect secondary metabolites in plant roots under distinct soil environment is not well elucidated. By combining multiple statistical analyses and network constructions, variations in soil eukaryotic diversity, community assembly processes and potential associations of holistic microbiotas were investigated in the bulk and rhizosphere soils of cultivated and wild licorice, and their regulatory patterns for root secondary metabolites were elucidated. The protistan communities displayed lower alpha diversity, more varied beta diversity patterns, and higher stochastic processes, as compared with fungal communities. Soil fungi individually played a more essential role than soil protists in the regulation of root secondary metabolites. Furthermore, rhizosphere soil was associated with more complicated networks than bulk soil; and wild licorice was associated with more complicated networks than cultivated licorice. Specific responsive modules resulting from networks were essential for the regulation of root secondary metabolites and were mostly affected by edaphic properties. Moreover, these modules directly or indirectly regulated the root secondary metabolites to varying degrees in the presence of soil protists. This indicated that the secondary metabolites were affected by associations between protistan, fungal and bacterial groups, and not merely by individual types of microorganisms in agricultural ecosystems. This study provides insight into the responses of root secondary metabolites to different groups of soil eukaryotic diversity and micro-foodwebs. The results have implications for comprehensively understanding the characteristics of the separate and combined roles of microbiotas for environmental management of licorice plantation ecosystem.
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Affiliation(s)
- Yang Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China
| | - Da Li
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China
| | - Hang Gao
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China
| | - Yuhua Li
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China
| | - Weimin Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China
| | - Shuo Jiao
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China
| | - Gehong Wei
- State Key Laboratory of Crop Stress Biology for Arid Areas, Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China.
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Gebauer L, Breitkreuz C, Heintz-Buschart A, Reitz T, Buscot F, Tarkka M, Bouffaud ML. Water Deficit History Selects Plant Beneficial Soil Bacteria Differently Under Conventional and Organic Farming. Front Microbiol 2022; 13:824437. [PMID: 35770171 PMCID: PMC9234553 DOI: 10.3389/fmicb.2022.824437] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 04/29/2022] [Indexed: 01/04/2023] Open
Abstract
Water deficit tolerance is critical for plant fitness and survival, especially when successive drought events happen. Specific soil microorganisms are however able to improve plant tolerance to stresses, such as those displaying a 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity. Microorganisms adapted to dry conditions can be selected by plants over time because of properties such as sporulation, substrate preference, or cell-wall thickness. However, the complexity and interconnection between abiotic factors, like drought or soil management, and biotic factors, like plant species identity, make it difficult to elucidate the general selection processes of such microorganisms. Using a pot experiment in which wheat and barley were grown on conventional and organic farming soils, we determined the effect of water deficit history on soil microorganisms by comparing single and successive events of water limitation. The analysis showed that water deficit strongly impacts the composition of both the total microbial community (16S rRNA genes) and one of ACC deaminase-positive (acdS+) microorganisms in the rhizosphere. In contrast, successive dry conditions moderately influence the abundance and diversity of both communities compared to a single dry event. We revealed interactive effects of the farming soil type and the water deficit conditioning treatment. Indeed, possibly due to better nutrient status, plants grown on soils from conventional farming showed higher growth and were able to select more adapted microbial taxa. Some of them are already known for their plant-beneficial properties like the Actinobacteria Streptomyces, but interestingly, some Proteobacteria were also enriched after a water deficit history under conventional farming. Our approach allowed us to identify key microbial taxa promoting drought adaptation of cereals, thus improving our understanding of drought effects on plant-microbe interactions.
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Affiliation(s)
- Lucie Gebauer
- Helmholtz Centre for Environmental Research, Halle, Germany
| | | | - Anna Heintz-Buschart
- Helmholtz Centre for Environmental Research, Halle, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
- Biosystems Data Analysis Group, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Thomas Reitz
- Helmholtz Centre for Environmental Research, Halle, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - François Buscot
- Helmholtz Centre for Environmental Research, Halle, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig, Germany
| | - Mika Tarkka
- Helmholtz Centre for Environmental Research, Halle, Germany
| | - Marie-Lara Bouffaud
- Helmholtz Centre for Environmental Research, Halle, Germany
- *Correspondence: Marie-Lara Bouffaud
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10
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Alternaria Black Spot (Alternaria brassicae) Infection Severity on Cruciferous Oilseed Crops. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11188507] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The increase in the cultivation area of cruciferous oilseed crops and the use of short crop rotation has resulted in the enhanced spread of several major pests in Northern latitudes. There is currently limited information about incidence and severity of Alternaria black spot disease (Alternaria brassicae) on the main oilseed crop, spring oilseed rape (Brassica napus), in the Northern Baltics. Thus, spring oilseed rape and five alternative cruciferous oilseed crops were selected and their resistance to black spot disease was evaluated in field conditions during two growing seasons. We hypothesized that spring oilseed rape is more susceptible to Alternaria black spot disease than other alternative cruciferous oilseed crops. Both growing seasons were warmer and drier compared to the long-term average, and were thus suitable for A. brassicae development and assessments. In both years, incidence of Alternaria black spot infection was recorded on all cruciferous species, yet the disease development differed considerably among the crops. During both growing seasons, black mustard (B. nigra) plants were the most infected. Based on our observations during warm growing seasons we conclude that alternative oilseed crops such as Sinapis alba, Eruca sativa and Raphanus sativus are more resistant to the Alternaria black spot infection than the traditional oilseed crops and thus, possess a great potential to grow with limited chemical disease control in Northern Baltic conditions.
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11
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Effects of Abiotic Stress on Soil Microbiome. Int J Mol Sci 2021; 22:ijms22169036. [PMID: 34445742 PMCID: PMC8396473 DOI: 10.3390/ijms22169036] [Citation(s) in RCA: 51] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 08/13/2021] [Accepted: 08/17/2021] [Indexed: 02/07/2023] Open
Abstract
Rhizospheric organisms have a unique manner of existence since many factors can influence the shape of the microbiome. As we all know, harnessing the interaction between soil microbes and plants is critical for sustainable agriculture and ecosystems. We can achieve sustainable agricultural practice by incorporating plant-microbiome interaction as a positive technology. The contribution of this interaction has piqued the interest of experts, who plan to do more research using beneficial microorganism in order to accomplish this vision. Plants engage in a wide range of interrelationship with soil microorganism, spanning the entire spectrum of ecological potential which can be mutualistic, commensal, neutral, exploitative, or competitive. Mutualistic microorganism found in plant-associated microbial communities assist their host in a number of ways. Many studies have demonstrated that the soil microbiome may provide significant advantages to the host plant. However, various soil conditions (pH, temperature, oxygen, physics-chemistry and moisture), soil environments (drought, submergence, metal toxicity and salinity), plant types/genotype, and agricultural practices may result in distinct microbial composition and characteristics, as well as its mechanism to promote plant development and defence against all these stressors. In this paper, we provide an in-depth overview of how the above factors are able to affect the soil microbial structure and communities and change above and below ground interactions. Future prospects will also be discussed.
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12
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Topalović O, Vestergård M. Can microorganisms assist the survival and parasitism of plant-parasitic nematodes? Trends Parasitol 2021; 37:947-958. [PMID: 34162521 DOI: 10.1016/j.pt.2021.05.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 05/19/2021] [Accepted: 05/20/2021] [Indexed: 12/14/2022]
Abstract
Plant-parasitic nematodes (PPNs) remain a hardly treatable problem in many crops worldwide. Low efficacy of many biocontrol agents may be due to negligence of the native microbiota that is naturally associated with nematodes in soil, and which may protect nematodes against microbial antagonists. This phenomenon is more extensively studied for other nematode parasites, so we compiled these studies and drew parallels to the existing knowledge on PPN. We describe how microbial-mediated modulation of host immune responses facilitate nematode parasitism and discuss the role of Caenorhabditis elegans-protective microbiota to get an insight into the microbial protection of PPNs in soil. Molecular mechanisms of PPN-microbial interactions are also discussed. An understanding of microbial-aided PPN performance is thus pivotal for efficient management of PPNs.
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Affiliation(s)
- Olivera Topalović
- Aarhus University, Institute for Agroecology, Faculty of Technical Sciences, Aarhus University, 4200, Slagelse, Denmark.
| | - Mette Vestergård
- Aarhus University, Institute for Agroecology, Faculty of Technical Sciences, Aarhus University, 4200, Slagelse, Denmark.
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13
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How does organic farming shape the soil- and plant-associated microbiota? Symbiosis 2021. [DOI: 10.1007/s13199-021-00767-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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Ouverson T, Eberly J, Seipel T, Menalled FD, Ishaq SL. Temporal Soil Bacterial Community Responses to Cropping Systems and Crop Identity in Dryland Agroecosystems of the Northern Great Plains. FRONTIERS IN SUSTAINABLE FOOD SYSTEMS 2021. [DOI: 10.3389/fsufs.2021.624242] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Industrialized agriculture results in simplified landscapes where many of the regulatory ecosystem functions driven by soil biological and physicochemical characteristics have been hampered or replaced with intensive, synthetic inputs. To restore long-term agricultural sustainability and soil health, soil should function as both a resource and a complex ecosystem. In this study, we examined how cropping systems impact soil bacterial community diversity and composition, important indicators of soil ecosystem health. Soils from a representative cropping system in the semi-arid Northern Great Plains were collected in June and August of 2017 from the final phase of a 5-year crop rotation managed either with chemical inputs and no-tillage, as a USDA-certified organic tillage system, or as a USDA-certified organic sheep grazing system with reduced tillage intensity. DNA was extracted and sequenced for bacteria community analysis via 16S rRNA gene sequencing. Bacterial richness and diversity decreased in all farming systems from June to August and was lowest in the chemical no-tillage system, while evenness increased over the sampling period. Crop species identity did not affect bacterial richness, diversity, or evenness. Conventional no-till, organic tilled, and organic grazed management systems resulted in dissimilar microbial communities. Overall, cropping systems and seasonal changes had a greater effect on microbial community structure and diversity than crop identity. Future research should assess how the rhizobiome responds to the specific phases of a crop rotation, as differences in bulk soil microbial communities by crop identity were not detectable.
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15
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Giraldo-Perez P, Raw V, Greven M, Goddard MR. A small effect of conservation agriculture on soil biodiversity that differs between biological kingdoms and geographic locations. iScience 2021; 24:102280. [PMID: 33817583 PMCID: PMC8008184 DOI: 10.1016/j.isci.2021.102280] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 01/12/2021] [Accepted: 03/03/2021] [Indexed: 12/28/2022] Open
Abstract
Larger easily visible animals and plants are negatively affected by agrochemicals used for intensive food production, but we do not understand the general spatial and temporal effects of agrochemicals on the multitudes of bacteria, fungi, and small invertebrate animals that underpin ecosystem productivity. We sequenced the 16S, ITS2, and COI DNA barcode regions from 648 New Zealand vineyard soil samples managed under either conventional or low-agrochemical-input conservation approaches across two regions and three seasons in 1 year and discovered at least 170,000 phylotypes (taxa) with >97% genetic identity. Management approach correlated with a significant 2%–10% difference in the abundances of phylotypes that differed over regions and seasons. Although the data show that agrochemicals do not have a large effect on soil biodiversity on average, the important finding is that the magnitude of impact differs between taxa types and locations, and some taxa most affected also influence the quality of agricultural produce. Agrochemicals have a small effect on soil bacterial, fungal, and animal biodiversity The effect differs in space (and less so time) and affects taxa abundances greatest There is no effect of agrochemicals on taxa richness The size of the effect differs between taxa but is greatest for eukaryotic taxa
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Affiliation(s)
- Paulina Giraldo-Perez
- The School of Biological Sciences, University of Auckland, Auckland 1010, New Zealand
| | - Victoria Raw
- The New Zealand Institute for Plant and Food Research Limited - Rangahau Ahumāra Kai, PO Box 845, Blenheim, New Zealand
| | - Marc Greven
- The New Zealand Institute for Plant and Food Research Limited - Rangahau Ahumāra Kai, PO Box 845, Blenheim, New Zealand
| | - Matthew R Goddard
- The School of Biological Sciences, University of Auckland, Auckland 1010, New Zealand.,The School of Life Sciences, University of Lincoln, Lincoln LN6 7DL, UK
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16
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Ares A, Costa J, Joaquim C, Pintado D, Santos D, Messmer MM, Mendes-Moreira PM. Effect of Low-Input Organic and Conventional Farming Systems on Maize Rhizosphere in Two Portuguese Open-Pollinated Varieties (OPV), "Pigarro" (Improved Landrace) and "SinPre" (a Composite Cross Population). Front Microbiol 2021; 12:636009. [PMID: 33717028 PMCID: PMC7953162 DOI: 10.3389/fmicb.2021.636009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 01/19/2021] [Indexed: 11/13/2022] Open
Abstract
Maize is one of the most important crops worldwide and is the number one arable crop in Portugal. A transition from the conventional farming system to organic agriculture requires optimization of cultivars and management, the interaction of plant-soil rhizosphere microbiota being pivotal. The objectives of this study were to unravel the effect of population genotype and farming system on microbial communities in the rhizosphere of maize. Rhizosphere soil samples of two open-pollinated maize populations ("SinPre" and "Pigarro") cultivated under conventional and organic farming systems were taken during flowering and analyzed by next-generation sequencing (NGS). Phenological data were collected from the replicated field trial. A total of 266 fungi and 317 bacteria genera were identified in "SinPre" and "Pigarro" populations, of which 186 (69.9%) and 277 (87.4%) were shared among them. The microbiota of "Pigarro" showed a significant higher (P < 0.05) average abundance than the microbiota of "SinPre." The farming system had a statistically significant impact (P < 0.05) on the soil rhizosphere microbiota, and several fungal and bacterial taxa were found to be farming system-specific. The rhizosphere microbiota diversity in the organic farming system was higher than that in the conventional system for both varieties. The presence of arbuscular mycorrhizae (Glomeromycota) was mainly detected in the microbiota of the "SinPre" population under the organic farming systems and very rare under conventional systems. A detailed metagenome function prediction was performed. At the fungal level, pathotroph-saprotroph and pathotroph-symbiotroph lifestyles were modified by the farming system. For bacterial microbiota, the main functions altered by the farming system were membrane transport, transcription, translation, cell motility, and signal transduction. This study allowed identifying groups of microorganisms known for their role as plant growth-promoting rhizobacteria (PGPR) and with the capacity to improve crop tolerance for stress conditions, allowing to minimize the use of synthetic fertilizers and pesticides. Arbuscular mycorrhizae (phyla Glomeromycota) were among the most important functional groups in the fungal microbiota and Achromobacter, Burkholderia, Erwinia, Lysinibacillus, Paenibacillus, Pseudomonas, and Stenotrophomonas in the bacterial microbiota. In this perspective, the potential role of these microorganisms will be explored in future research.
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Affiliation(s)
- Aitana Ares
- Department of Life Sciences, Centre for Functional Ecology, University of Coimbra, Coimbra, Portugal.,Laboratory for Phytopathology, Instituto Pedro Nunes, Coimbra, Portugal
| | - Joana Costa
- Department of Life Sciences, Centre for Functional Ecology, University of Coimbra, Coimbra, Portugal.,Laboratory for Phytopathology, Instituto Pedro Nunes, Coimbra, Portugal
| | - Carolina Joaquim
- Centro de Recursos Naturais, Ambiente e Sociedade (CERNAS), Coimbra, Portugal
| | - Duarte Pintado
- Centro de Recursos Naturais, Ambiente e Sociedade (CERNAS), Coimbra, Portugal
| | - Daniela Santos
- Centro de Recursos Naturais, Ambiente e Sociedade (CERNAS), Coimbra, Portugal
| | - Monika M Messmer
- Research Institute of Organic Agriculture (FiBL), Frick, Switzerland
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17
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Characterization of the Habitat- and Season-Independent Increase in Fungal Biomass Induced by the Invasive Giant Goldenrod and Its Impact on the Fungivorous Nematode Community. Microorganisms 2021; 9:microorganisms9020437. [PMID: 33669897 PMCID: PMC7923273 DOI: 10.3390/microorganisms9020437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 02/08/2021] [Accepted: 02/14/2021] [Indexed: 12/04/2022] Open
Abstract
Outside its native range, the invasive plant species giant goldenrod (Solidago gigantea) has been shown to increase belowground fungal biomass. This non-obvious effect is poorly characterized; we don’t know whether it is plant developmental stage-dependent, which fractions of the fungal community are affected, and whether it is reflected in the next trophic level. To address these questions, fungal assemblages in soil samples collected from invaded and uninvaded plots in two soil types were compared. Although using ergosterol as a marker for fungal biomass demonstrated a significant increase in fungal biomass, specific quantitative PCR (qPCR) assays did not point at a quantitative shift. MiSeq-based characterization of the belowground effects of giant goldenrod revealed a local increase of mainly Cladosporiaceae and Glomeraceae. This asymmetric boost in the fungal community was reflected in a specific shift in the fungivorous nematode community. Our findings provide insight into the potential impact of invasive plants on local fungal communities.
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18
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Kundel D, Bodenhausen N, Jørgensen HB, Truu J, Birkhofer K, Hedlund K, Mäder P, Fliessbach A. Effects of simulated drought on biological soil quality, microbial diversity and yields under long-term conventional and organic agriculture. FEMS Microbiol Ecol 2020; 96:fiaa205. [PMID: 33016314 PMCID: PMC7705324 DOI: 10.1093/femsec/fiaa205] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 10/02/2020] [Indexed: 11/12/2022] Open
Abstract
Drought and agricultural management influence soil microorganisms with unknown consequences for the functioning of agroecosystems. We simulated drought periods in organic (biodynamic) and conventional wheat fields and monitored effects on soil water content, microorganisms and crops. Above the wilting point, water content and microbial respiration were higher under biodynamic than conventional farming. Highest bacterial and fungal abundances were found in biodynamically managed soils, and distinct microbial communities characterised the farming systems. Most biological soil quality parameters and crop yields were only marginally affected by the experimental drought, except for arbuscular mycorrhizal fungi (AMF), which increased in abundance under the experimental drought in both farming systems. AMF were further strongly promoted by biodynamic farming resulting in almost three times higher AMF abundance under experimental drought in the biodynamic compared with the conventional farming system. Our data suggest an improved water storage capacity under biodynamic farming and confirms positive effects of biodynamic farming on biological soil quality. The interactive effects of the farming system and drought may further be investigated under more substantial droughts. Given the importance of AMF for the plant's water supply, more in-depth studies on AMF may help to clarify their role for yields under conditions predicted by future climate scenarios.
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Affiliation(s)
- Dominika Kundel
- Department of Soil Sciences, Research Institute of Organic Agriculture (FiBL), 5070 Frick, Switzerland
- Ecology, Department of Biology, University of Konstanz, 78464 Konstanz, Germany
| | - Natacha Bodenhausen
- Department of Soil Sciences, Research Institute of Organic Agriculture (FiBL), 5070 Frick, Switzerland
| | | | - Jaak Truu
- Institute of Molecular and Cell Biology, University of Tartu, 51010 Tartu, Estonia
| | - Klaus Birkhofer
- Department of Ecology, Brandenburg University of Technology, 03046 Cottbus, Germany
| | | | - Paul Mäder
- Department of Soil Sciences, Research Institute of Organic Agriculture (FiBL), 5070 Frick, Switzerland
| | - Andreas Fliessbach
- Department of Soil Sciences, Research Institute of Organic Agriculture (FiBL), 5070 Frick, Switzerland
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19
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Fiore-Donno AM, Richter-Heitmann T, Bonkowski M. Contrasting Responses of Protistan Plant Parasites and Phagotrophs to Ecosystems, Land Management and Soil Properties. Front Microbiol 2020; 11:1823. [PMID: 32849427 PMCID: PMC7422690 DOI: 10.3389/fmicb.2020.01823] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 07/10/2020] [Indexed: 11/13/2022] Open
Abstract
Functional traits are increasingly used in ecology to link the structure of microbial communities to ecosystem processes. We investigated two important protistan lineages, Cercozoa and Endomyxa (Rhizaria) in soil using Illumina sequencing and analyzed their diversity and functional traits along with their responses to environmental factors in grassland and forest across Germany. From 600 soil samples, we obtained 2,101 Operational Taxonomic Units representing ∼18 million Illumina reads (region V4, 18S rRNA gene). All major taxonomic and functional groups were present, dominated by small bacterivorous flagellates (Glissomonadida). Endomyxan plant parasites were absent from forests. In grassland, Cercozoa and Endomyxa were promoted by more intensive land use management. Grassland and forest strikingly differed in community composition. Relative abundances of bacterivores and eukaryvores were inversely influenced by environmental factors. These patterns provide new insights into the functional organization of soil biota and indications for a more sustainable land-use management.
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Affiliation(s)
- Anna Maria Fiore-Donno
- Terrestrial Ecology Group, Institute of Zoology, University of Cologne, Cologne, Germany.,Cluster of Excellence on Plant Sciences (CEPLAS), Cologne, Germany
| | - Tim Richter-Heitmann
- Microbial Ecophysiology Group, Faculty of Biology/Chemistry, University of Bremen, Bremen, Germany
| | - Michael Bonkowski
- Terrestrial Ecology Group, Institute of Zoology, University of Cologne, Cologne, Germany.,Cluster of Excellence on Plant Sciences (CEPLAS), Cologne, Germany
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20
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Chaudhari D, Rangappa K, Das A, Layek J, Basavaraj S, Kandpal BK, Shouche Y, Rahi P. Pea ( Pisum sativum l.) Plant Shapes Its Rhizosphere Microbiome for Nutrient Uptake and Stress Amelioration in Acidic Soils of the North-East Region of India. Front Microbiol 2020; 11:968. [PMID: 32582047 PMCID: PMC7283456 DOI: 10.3389/fmicb.2020.00968] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 04/22/2020] [Indexed: 12/26/2022] Open
Abstract
Rhizosphere microbiome significantly influences plant growth and productivity. Legume crops such as pea have often been used as a rotation crop along with rice cultivation in long-term conservation agriculture experiments in the acidic soils of the northeast region of India. It is essential to understand how the pea plant influences the soil communities and shapes its rhizosphere microbiome. It is also expected that the long-term application of nutrients and tillage practices may also have a lasting effect on the rhizosphere and soil communities. In this study, we estimated the bacterial communities by 16S rRNA gene amplicon sequencing of pea rhizosphere and bulk soils from a long-term experiment with multiple nutrient management practices and different tillage history. We also used Tax4Fun to predict the functions of bacterial communities. Quantitative polymerase chain reaction (qPCR) was used to estimate the abundance of total bacterial and members of Firmicutes in the rhizosphere and bulk soils. The results showed that bacterial diversity was significantly higher in the rhizosphere in comparison to bulk soils. A higher abundance of Proteobacteria was recorded in the rhizosphere, whereas the bulk soils have higher proportions of Firmicutes. At the genus level, proportions of Rhizobium, Pseudomonas, Pantoea, Nitrobacter, Enterobacter, and Sphingomonas were significantly higher in the rhizosphere. At the same time, Massilia, Paenibacillus, and Planomicrobium were more abundant in the bulk soils. Higher abundance of genes reported for plant growth promotion and several other genes, including iron complex outer membrane receptor, cobalt-zinc-cadmium resistance, sigma-70 factor, and ribonuclease E, was predicted in the rhizosphere samples in comparison to bulk soils, indicating that the pea plants shape their rhizosphere microbiome, plausibly to meet its requirements for nutrient uptake and stress amelioration.
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Affiliation(s)
- Diptaraj Chaudhari
- National Center for Microbial Resource, National Center for Cell Science, Pune, India
| | | | - Anup Das
- ICAR Research Complex for North Eastern Hill Region, Umiam, India
| | - Jayanta Layek
- ICAR Research Complex for North Eastern Hill Region, Umiam, India
| | - Savita Basavaraj
- ICAR Research Complex for North Eastern Hill Region, Umiam, India
| | | | - Yogesh Shouche
- National Center for Microbial Resource, National Center for Cell Science, Pune, India
| | - Praveen Rahi
- National Center for Microbial Resource, National Center for Cell Science, Pune, India
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21
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Harkes P, van Steenbrugge JJM, van den Elsen SJJ, Suleiman AKA, de Haan JJ, Holterman MHM, Helder J. Shifts in the Active Rhizobiome Paralleling Low Meloidogyne chitwoodi Densities in Fields Under Prolonged Organic Soil Management. FRONTIERS IN PLANT SCIENCE 2020; 10:1697. [PMID: 31998352 PMCID: PMC6965313 DOI: 10.3389/fpls.2019.01697] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 12/02/2019] [Indexed: 06/10/2023]
Abstract
Plants manipulate their rhizosphere community in a species and even a plant life stage-dependent manner. In essence plants select, promote and (de)activate directly the local bacterial and fungal community, and indirectly representatives of the next trophic level, protists and nematodes. By doing so, plants enlarge the pool of bioavailable nutrients and maximize local disease suppressiveness within the boundaries set by the nature of the local microbial community. MiSeq sequencing of specific variable regions of the 16S or 18S ribosomal DNA (rDNA) is widely used to map microbial shifts. As current RNA extraction procedures are time-consuming and expensive, the rRNA-based characterization of the active microbial community is taken along less frequently. Recently, we developed a relatively fast and affordable protocol for the simultaneous extraction of rDNA and rRNA from soil. Here, we investigated the long-term impact of three type of soil management, two conventional and an organic regime, on soil biota in fields naturally infested with the Columbian root-knot nematode Meloidogyne chitwoodi with pea (Pisum sativum) as the main crop. For all soil samples, large differences were observed between resident (rDNA) and active (rRNA) microbial communities. Among the four organismal group under investigation, the bacterial community was most affected by the main crop, and unweighted and weighted UniFrac analyses (explaining respectively 16.4% and 51.3% of the observed variation) pointed at a quantitative rather than a qualitative shift. LEfSe analyses were employed for each of the four organismal groups to taxonomically pinpoint the effects of soil management. Concentrating on the bacterial community in the pea rhizosphere, organic soil management resulted in a remarkable activation of members of the Burkholderiaceae, Enterobacteriaceae, and Pseudomonadaceae. Prolonged organic soil management was also accompanied by significantly higher densities of bacterivorous nematodes, whereas levels of M. chitwoodi had dropped drastically. Though present and active in the fields under investigation Orbiliaceae, a family harboring numerous nematophagous fungi, was not associated with the M. chitwoodi decline. A closer look revealed that a local accumulation and activation of Pseudomonas, a genus that includes a number of nematode-suppressive species, paralleled the lower M. chitwoodi densities. This study underlines the relevance of taking along both resident and active fractions of multiple organismal groups while mapping the impact of e.g. crops and soil management regimes.
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Affiliation(s)
- Paula Harkes
- Laboratory of Nematology, Department of Plant Sciences, Wageningen University & Research, Wageningen, Netherlands
| | | | | | - Afnan Khalil Ahmad Suleiman
- Department of Microbial Ecology, NIOO-KNAW, Wageningen, Netherlands
- Department of Microbiological Water Quality and Health, KWR Watercycle Research Institute, PE Nieuwegein, Netherlands
| | - Johannes Jan de Haan
- Open Teelten, Department of Wageningen Plant Research, Wageningen University & Research, Lelystad, Netherlands
| | | | - Johannes Helder
- Laboratory of Nematology, Department of Plant Sciences, Wageningen University & Research, Wageningen, Netherlands
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