A streptomycete antagonist to Phellinus weirii, Fomes annosus, and Phytophthora cinnamomi

Rose, S. L.; Li, Ching-Yan; Hutchins, Anita Stiebrs

doi:10.1139/m80-103

Cited by 22 publications

(12 citation statements)

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“…A number of investigations have reported antagonism of root-pathogenic fungi by soil actinomycetes (6,40) and that especially streptomycetes are a rich source of antifungal compounds (20).…”

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Auxofuran, a Novel Metabolite That Stimulates the Growth of Fly Agaric, Is Produced by the Mycorrhiza Helper Bacterium Streptomyces Strain AcH 505

Riedlinger¹,

Schrey

Tarkka

et al. 2006

Appl Environ Microbiol

149

126

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The mycorrhiza helper bacterium Streptomyces strain AcH 505 improves mycelial growth of ectomycorrhizal fungi and formation of ectomycorrhizas between Amanita muscaria and spruce but suppresses the growth of plant-pathogenic fungi, suggesting that it produces both fungal growth-stimulating and -suppressing compounds. The dominant fungal-growth-promoting substance produced by strain AcH 505, auxofuran, was isolated, and its effect on the levels of gene expression of A. muscaria was investigated. Auxofuran and its synthetic analogue 7-dehydroxy-auxofuran were most effective at a concentration of 15 M, and application of these compounds led to increased lipid metabolism-related gene expression. Cocultivation of strain AcH 505 and A. muscaria stimulated auxofuran production by the streptomycete. The antifungal substances produced by strain AcH 505 were identified as the antibiotics WS-5995 B and C. WS-5995 B completely blocked mycelial growth at a concentration of 60 M and caused a cell stress-related gene expression response in A. muscaria. Characterization of these compounds provides the foundation for molecular analysis of the fungus-bacterium interaction in the ectomycorrhizal symbiosis between fly agaric and spruce.Actinomycetes are known for their capacity to control plant diseases. A number of investigations have reported antagonism of root-pathogenic fungi by soil actinomycetes (6, 40) and that especially streptomycetes are a rich source of antifungal compounds (20).Ectomycorrhizas (ECM) are widespread symbiotic organs that are formed during interactions between most tree species or perennials and soil fungi (44). The establishment of the symbiosis is affected by other soil microbes, such as bacteria and other fungi (18,29). Understanding the interactions between the soil-inhabiting microorganisms in the mycorrhizosphere is very important, as they are key players in nutrient cycling in forest soils (29).Under natural conditions, the plant partner is able to select for bacterial strains that are beneficial for the ECM symbiosis and for plant growth (16). Specifically, the growth of ectomycorrhizal fungi and mycorrhiza formation are promoted by some of the mycorrhizosphere bacteria (mycorrhiza helper bacteria [MHB] [18]), which belong to the genera Bacillus, Burkholderia, Pseudomonas, Rhodococcus, and Streptomyces (15,19,30,37,42).When 12 actinomycete isolates were tested to determine their effects on mycelial growth of ectomycorrhizal fungi (39), the bacterial isolates inhibited, promoted, or had no significant effect on hyphal extension in dual cultures. Thus, there is an opportunity to select for actinomycetes that stimulate certain symbiotic fungi and plant growth but are antagonistic to pathogenic organisms. To do this, we isolated a collection of actinomycetes from the hyphosphere of a spruce (Picea abies) stand and examined their effects on symbiotic and plant-pathogenic fungi (30,31). One member of this collection, streptomycete strain AcH 505, exhibited the desired qualities, as it significantly pro...

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Auxofuran, a Novel Metabolite That Stimulates the Growth of Fly Agaric, Is Produced by the Mycorrhiza Helper Bacterium Streptomyces Strain AcH 505

Riedlinger¹,

Schrey

Tarkka

et al. 2006

Appl Environ Microbiol

149

126

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“…stands that were asymptomatic of Armillaria, but they did not elaborate on the abilities of these bacteria to inhibit Armillaria. HUTCHINS (1980) isolated a species of Bacillus that inhibited Armillaria from alder ( A h u s sp.) forest soil.…”

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Inhibition of Armillaria by bacteria isolated from soils of the Boreal Mixedwood Forest of Ontario

Dumas

1992

European Journal of Forest Pathology

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Pseudomonas fluorescens, Pseudomonas s p., Bacillus spp., Enterobacter spp., Serratia spp. and Agrobacteriurn radiobacter were isolated Lorn root-free soils of the Boreal Mixedwood Forest of Ontario qnd found to be capable of inhibiting the linear growth of Armillaria ostoyae in vitro. Isolates of I! fluorescens, Bacillus spp. and A. radiobacter were the most effective inhibitors of m celial growth. To test the ability of the bacteria to suppress rhizomorph formation, A. gallica, wlich roduces rhizomorphs in culture more consistently than does A. ostoyae, was used; only a small gaction of I! fluorescens and Bacillus spp. isolates were capable of preventing in vitro rhizomorph formation by A. gallica.

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“…Although the API ZYM system was able to differenti- Numerous investigators have reported antagonistic effects of actinomycetes to a variety of bacteria and fungi both in and out of the rhizospheres of grasses and other plants (Strzelczyk 1961;Rice 1964;Rose et al 1980). The inhibition is thought to be due primarily to an antimicrobial substance or antibiotic produced by the actinomycetes (Ballesta and Alexander 1972).…”

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“…Much recent work has been done on antagonistic effects of actinomycetes against fungi (Rose et al 1980;Whaley and Boyle 1967) and on the bacterial genus Rhizobium (Pate1 1974). However, with the exception of some work on Azotobacter (Strzelczyk 1961;Pate1 and Brown 1969), little information is available on the antagonistic effects of actinomycetes against a variety of nonsymbiotic nitrogen-fixing bacteria from the rhizospheres of grasses.…”

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In vitro inhibition of nonsymbiotic nitrogen-fixing bacteria by rhizosphere actinomycetes associated with grasses

Zuberer¹,

Roth²

1982

Can. J. Microbiol.

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Eighty-five isolates of actinomycetes were obtained from the rhizospheres of 10 indigenous grasses of central Texas. Of these, 10 were classified as members of the genus Nocardia; the remainder were members of the genus Streptomyces. To determine whether antibiotic production might be a significant factor in the establishment of associative symbioses between grasses and diazotrophic bacteria, 12 strains of free-living nitrogen-fixing bactria were cross streaked against each actinomycete isolate. This in vitro assay indicated that 78% of the 85 isolates were antagonistic to at least one of the 12 nitrogen-fixing bacterial strains.

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A streptomycete antagonist to Phellinus weirii, Fomes annosus, and Phytophthora cinnamomi

Cited by 22 publications

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Auxofuran, a Novel Metabolite That Stimulates the Growth of Fly Agaric, Is Produced by the Mycorrhiza Helper Bacterium Streptomyces Strain AcH 505

Auxofuran, a Novel Metabolite That Stimulates the Growth of Fly Agaric, Is Produced by the Mycorrhiza Helper Bacterium Streptomyces Strain AcH 505

Inhibition of Armillaria by bacteria isolated from soils of the Boreal Mixedwood Forest of Ontario

In vitro inhibition of nonsymbiotic nitrogen-fixing bacteria by rhizosphere actinomycetes associated with grasses

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