Interaction with mycorrhiza helper bacterium Streptomyces sp. AcH 505 modifies organisation of actin cytoskeleton in the ectomycorrhizal fungus Amanita muscaria (fly agaric)

Schrey, Silvia D.; Salo, Vanamo; Raudaskoski, Marjatta; Hampp, Rüdiger; Nehls, Uwe; Tarkka, Mika

doi:10.1007/s00294-007-0138-x

Cited by 41 publications

(19 citation statements)

References 37 publications

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“…Nevertheless, we observed a decrease of fungal biomass. The sharply reduced biomass/colony area ratio was caused both by a reduction in mycelial density and thinning of hyphae (Maier 2003;Schrey et al 2007). The structural background of hyphal thinning was due to a specific modification in A. muscaria actin cytoskeleton.…”

Section: Growth Factors and Cell Stress: Complex Interactions Betweenmentioning

confidence: 98%

Friends and foes: streptomycetes as modulators of plant disease and symbiosis

Schrey

Tarkka

2008

Antonie van Leeuwenhoek

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165

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The ecological role of soil streptomycetes within the plant root environment is currently gaining increased attention. This review describes our recent advances in elucidating the complex interactions between streptomycetes, plants, pathogenic and symbiotic microorganisms. Streptomycetes play diverse roles in plant-associated microbial communities. Some act as biocontrol agents, inhibiting plant interactions with pathogenic organisms. Owing to the antagonistic properties of streptomycetes, they exert a selective pressure on soil microbes, which may not always be for plant benefit. Others promote the formation of symbioses between plant roots and microbes, and this is in part due to their direct positive influence on the symbiotic partner, expressed as, e.g., promotion of hyphal elongation of symbiotic fungi. Recently, streptomycetes have been identified as modulators of plant defence. By repressing plant responses to pathogens they facilitate root colonisation with pathogenic fungi. In contrast, other strains induce local and systemic resistance against pathogens or enhance plant growth. In conclusion, while streptomycetes have a clear potential of acting as biocontrol agents, care has to be taken to avoid strains that select for virulent pathogens or enhance disease development. We argue towards the use of an integrated screening approach in the search for efficient biocontrol agents, including assays on in vitro antagonism, plant growth, and disease suppression.

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Section: Growth Factors and Cell Stress: Complex Interactions Betweenmentioning

confidence: 98%

Friends and foes: streptomycetes as modulators of plant disease and symbiosis

Schrey

Tarkka

2008

Antonie van Leeuwenhoek

Self Cite

165

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“…The mycorrhizal helper strain Streptomyces sp. AcH505 was shown to have a pronounced effect on the organization of the cytoskeleton of the ectomycorrhizal fungus Amanita muscaria (351). The same strain also produces auxofuran, a metabolite that contributes to its growth-promoting effect, the synthesis of which is promoted in bacterial-fungal cocultures and at acidic pH values that typify the growth conditions of ectomycorrhizal fungi (323).…”

Section: Consequences Of Bacterial-fungal Interactions For Participatmentioning

confidence: 99%

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

Frey‐Klett

Burlinson

Deveau

et al. 2011

Microbiol Mol Biol Rev

737

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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“…AcH 505 is a fungus-specific MHB that produces fungus growth regulators and affects plant health and development. When tree roots were inoculated with a suspension of AcH 505 mycelia, significant stimulation of mycorrhiza formation was observed [19]. In the oak system, we also could find a slight increase in the number of mycorrhizas when the microcosm soil was inoculated with AcH 505.…”

Section: Discussionmentioning

confidence: 89%

“…We have previously shown [5,19,21] that Streptomyces sp. AcH 505 is a fungus-specific MHB that produces fungus growth regulators and affects plant health and development.…”

Section: Discussionmentioning

confidence: 99%

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Detection and quantification of a mycorrhization helper bacterium and a mycorrhizal fungus in plant-soil microcosms at different levels of complexity

et al. 2013

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BackgroundHost plant roots, mycorrhizal mycelium and microbes are important and potentially interacting factors shaping the performance of mycorrhization helper bacteria (MHB). We investigated the impact of a soil microbial community on the interaction between the extraradical mycelium of the ectomycorrhizal fungus Piloderma croceum and the MHB Streptomyces sp. AcH 505 in both the presence and the absence of pedunculate oak microcuttings.ResultsSpecific primers were designed to target the internal transcribed spacer of the rDNA and an intergenic region between two protein encoding genes of P. croceum and the intergenic region between the gyrA and gyrB genes of AcH 505. These primers were used to perform real-time PCR with DNA extracted from soil samples. With a sensitivity of 10 genome copies and a linear range of 6 orders of magnitude, these real-time PCR assays enabled the quantification of purified DNA from P. croceum and AcH 505, respectively. In soil microcosms, the fungal PCR signal was not affected by AcH 505 in the absence of the host plant. However, the fungal signal became weaker in the presence of the plant. This decrease was only observed in microbial filtrate amended microcosms. In contrast, the PCR signal of AcH 505 increased in the presence of P. croceum. The increase was not significant in sterile microcosms that contained plant roots.ConclusionsReal-time quantitative PCR assays provide a method for directly detecting and quantifying MHB and mycorrhizal fungi in plant microcosms. Our study indicates that the presence of microorganisms and plant roots can both affect the nature of MHB-fungus interactions, and that mycorrhizal fungi may enhance MHB growth.

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Interaction with mycorrhiza helper bacterium Streptomyces sp. AcH 505 modifies organisation of actin cytoskeleton in the ectomycorrhizal fungus Amanita muscaria (fly agaric)

Cited by 41 publications

References 37 publications

Friends and foes: streptomycetes as modulators of plant disease and symbiosis

Friends and foes: streptomycetes as modulators of plant disease and symbiosis

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

Detection and quantification of a mycorrhization helper bacterium and a mycorrhizal fungus in plant-soil microcosms at different levels of complexity

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