Ectomycorrhizal symbiosis affects functional diversity of rhizosphere fluorescent pseudomonads

Frey‐Klett, Pascale; Chavatte, Michaël; Clausse, M.L.; Courrier, Sébastien; Roux, Christine Le; Raaijmakers, Jos M.; Martinotti, Maria Giovanna; Pierrat, Jean-Claude; Garbaye, Jean

doi:10.1111/j.1469-8137.2004.01212.x

Cited by 228 publications

(128 citation statements)

References 75 publications

(94 reference statements)

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“…The mineral weathering potential of bacterial isolates was assessed using two bioassays measuring the abilities (i) to mobilize iron and (ii) to solubilize tricalcium orthophosphate. The ability to mobilize iron was tested by following the protocol of Frey-Klett et al (81) using chrome azurol S (CAS) medium. This bioassay is used to highlight siderophore production (82).…”

Section: Methodsmentioning

confidence: 99%

Mineral Types and Tree Species Determine the Functional and Taxonomic Structures of Forest Soil Bacterial Communities

Colin

Nicolitch

Turpault³

et al. 2017

Appl Environ Microbiol

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Although minerals represent important soil constituents, their impact on the diversity and structure of soil microbial communities remains poorly documented. In this study, pure mineral particles with various chemistries (i.e., obsidian, apatite, and calcite) were considered. Each mineral type was conditioned in mesh bags and incubated in soil below different tree stands (beech, coppice with standards, and Corsican pine) for 2.5 years to determine the relative impacts of mineralogy and mineral weatherability on the taxonomic and functional diversities of mineral-associated bacterial communities. After this incubation period, the minerals and the surrounding bulk soil were collected to determine mass loss and to perform soil analyses, enzymatic assays, and cultivation-dependent and -independent analyses. Notably, our 16S rRNA gene pyrosequencing analyses revealed that after the 2.5-year incubation period, the mineral-associated bacterial communities strongly differed from those of the surrounding bulk soil for all tree stands considered. When focusing only on minerals, our analyses showed that the bacterial communities associated with calcite, the less recalcitrant mineral type, significantly differed from those that colonized obsidian and apatite minerals. The cultivation-dependent analysis revealed significantly higher abundances of effective mineral-weathering bacteria on the most recalcitrant minerals (i.e., apatite and obsidian). Together, our data showed an enrichment of Betaproteobacteria and effective mineral-weathering bacteria related to the Burkholderia and Collimonas genera on the minerals, suggesting a key role for these taxa in mineral weathering and nutrient cycling in nutrient-poor forest ecosystems.IMPORTANCE Forests are usually developed on nutrient-poor and rocky soils, while nutrient-rich soils have been dedicated to agriculture. In this context, nutrient recycling and nutrient access are key processes in such environments. Deciphering how soil mineralogy influences the diversity, structure, and function of soil bacterial communities in relation to the soil conditions is crucial to better understanding the relative role of the soil bacterial communities in nutrient cycling and plant nutrition in nutrient-poor environments. The present study determined in detail the diversity and structure of bacterial communities associated with different mineral types incubated for 2.5 years in the soil under different tree species using cultivationdependent and -independent analyses. Our data showed an enrichment of specific bacterial taxa on the minerals, specifically on the most weathered minerals, suggesting that they play key roles in mineral weathering and nutrient cycling in nutrientpoor forest ecosystems.KEYWORDS mineral chemistry, bacterial communities, forest soil, mesh bags, mineral weatherability

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Section: Methodsmentioning

confidence: 99%

Mineral Types and Tree Species Determine the Functional and Taxonomic Structures of Forest Soil Bacterial Communities

Colin

Nicolitch

Turpault³

et al. 2017

Appl Environ Microbiol

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“…This results from direct effects of the mycorrhizal fungus on the plant but also from indirect effects of the mycorrhizal symbiosis on the surrounding bacterial communities. Indeed, in vitro antagonism against phytopathogenic fungi by mycorrhiza-associated bacteria has been frequently reported (12,74,217,230), and there is evidence for the enrichment of bacterial communities with a high antagonistic potential toward fungal pathogens by mycorrhizal and other fungi (88,117). Further experiments will be necessary to determine whether these observations result exclusively from fungally induced selection on the bacterial community from the soil reservoir.…”

Section: Roles In Host Health and Diseasementioning

confidence: 96%

Bacterial-Fungal Interactions: Hyphens between Agricultural, Clinical, Environmental, and Food Microbiologists

Frey‐Klett

Burlinson

Deveau

et al. 2011

Microbiol Mol Biol Rev

700

531

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SUMMARY Bacteria and fungi can form a range of physical associations that depend on various modes of molecular communication for their development and functioning. These bacterial-fungal interactions often result in changes to the pathogenicity or the nutritional influence of one or both partners toward plants or animals (including humans). They can also result in unique contributions to biogeochemical cycles and biotechnological processes. Thus, the interactions between bacteria and fungi are of central importance to numerous biological questions in agriculture, forestry, environmental science, food production, and medicine. Here we present a structured review of bacterial-fungal interactions, illustrated by examples sourced from many diverse scientific fields. We consider the general and specific properties of these interactions, providing a global perspective across this emerging multidisciplinary research area. We show that in many cases, parallels can be drawn between different scenarios in which bacterial-fungal interactions are important. Finally, we discuss how new avenues of investigation may enhance our ability to combat, manipulate, or exploit bacterial-fungal complexes for the economic and practical benefit of humanity as well as reshape our current understanding of bacterial and fungal ecology.

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“…A hypothesis for sustainable forest development proposes that tree roots select from the soil efficient mineral weathering bacterial communities that may contribute to nutrient mobilization and tree growth (20). In this manner, recent studies (10,46) have revealed that the oak-Scleroderma citrinum ectomycorrhizal symbiosis selects bacterial communities that are more efficient in mineral weathering than those of the surrounding soil, suggesting that the mycorrhizal symbiosis has an indirect effect on plant nutrition through its selective pressure on the functional diversity of the mycorrhizosphere bacterial communities.…”

mentioning

confidence: 99%

Influence of Forest Trees on the Distribution of Mineral Weathering-Associated Bacterial Communities of the Scleroderma citrinum Mycorrhizosphere

Calvaruso¹,

Turpault²,

Leclerc

et al. 2010

Appl Environ Microbiol

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In acidic forest soils, availability of inorganic nutrients is a tree-growth-limiting factor. A hypothesis to explain sustainable forest development proposes that tree roots select soil microbes involved in central biogeochemical processes, such as mineral weathering, that may contribute to nutrient mobilization and tree nutrition. Here we showed, by combining soil analyses with cultivation-dependent analyses of the culturable bacterial communities associated with the widespread mycorrhizal fungus Scleroderma citrinum, a significant enrichment of bacterial isolates with efficient mineral weathering potentials around the oak and beech mycorrhizal roots compared to bulk soil. Such a difference did not exist in the rhizosphere of Norway spruce. The mineral weathering ability of the bacterial isolates was assessed using a microplaque assay that measures the pH and the amount of iron released from biotite. Using this microplate assay, we demonstrated that the bacterial isolates harboring the most efficient mineral weathering potential belonged to the Burkholderia genus. Notably, previous work revealed that oak and beech harbored very similar pHs in the 5-to 10-cm horizon in both rhizosphere and bulk soil environments. In the spruce rhizosphere, in contrast, the pH was significantly lower than that in bulk soil. Because the production of protons is one of the main mechanisms responsible for mineral weathering, our results suggest that certain tree species have developed indirect strategies for mineral weathering in nutrient-poor soils, which lie in the selection of bacterial communities with efficient mineral weathering potentials.

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Ectomycorrhizal symbiosis affects functional diversity of rhizosphere fluorescent pseudomonads

Cited by 228 publications

References 75 publications

Mineral Types and Tree Species Determine the Functional and Taxonomic Structures of Forest Soil Bacterial Communities

Mineral Types and Tree Species Determine the Functional and Taxonomic Structures of Forest Soil Bacterial Communities

Bacterial-Fungal Interactions: Hyphens between Agricultural, Clinical, Environmental, and Food Microbiologists

Influence of Forest Trees on the Distribution of Mineral Weathering-Associated Bacterial Communities of the Scleroderma citrinum Mycorrhizosphere

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