Über Mischinfektionen mit Ophiobolus graminis und Didymella exitialis

H, Siegle

doi:10.1111/j.1439-0434.1961.tb01961.x

Cited by 16 publications

(4 citation statements)

References 54 publications

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“…Strain 1-52 was observed to parasitize hyphae of Ggt on PDA. While fungi associated with take-all suppressive soils or with antagonism of Ggt have been reported by others (Dewan and Sivasithamparam, 1988;Mangan, 1967;Siegel, 1961;Simon and Sivasithamparam, 1988;Wong and Siviour, 1979), the level of protection provided by the two antagonistic fungi described in this research does not appear to have been reported elsewhere.…”

Section: Discussionmentioning

confidence: 66%

“…Fungi showing antagonism to Ggt have been reported (Dewan and Sivasithamparam, 1988;Siegel, 1961;Simon and Sivasithamparam, 1988). Actinomycetes, particularly Streptomyces spp.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the finding of Broadbent et al (1971) that organisms lacking antibiosis in vitro were also ineffective in soil, numerous reports indicate that mechanisms other than antibiosis, e.g. mycoparasitism, induction of phytoalexins in roots, and competition may be involved in suppression of Ggt (Fravel, 1988;Poplawsky and Ellingboe, 1989;Siegel, 1961;Sivasithamparam and Parker, 1978;Thomashow and Weller, 1990). Furthermore antibiosis in vitro is highly affected by the constitution of the culture medium used to test for antagonism (Fravel, 1988;Rovira and Witdermuth, 1981).…”

Section: Introductionmentioning

confidence: 99%

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Natural suppression of take-all disease of wheat in Montana soils

1994

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This research was initiated to determine whether soils suppressive to take-all of wheat caused by Gaeumannomyces graminis var. tritici (Ggt) occur in Montana, and to identify the organisms most likely involved in this suppression. From an initial screening of eight soils collected from different wheat growing areas of Montana, two were highly suppressive to take-all. Microbial characterization of these soils indicated that different mechanisms were involved in the suppression. In Larslan soil, mycoparasitism appeared to be the main mechanism. Two different fungi with exceptional ability to reduce the severity of take-all were isolated from this soil. One of these fungi could parasitize the hyphae of Ggt. Field tests with these fungi in Ggt infested soil showed increases of over 100% in both harvestable tillers and grain yield as compared to treatments without these two fungi. In tests with 48 different bacteria and 10 actinomycetes from Larslan soil, none were able to consistently reduce severity of take-all alone, or in mixtures. In Toston soil, antibiosis by actinomycetes and perhaps the involvement of Pseudomonas spp. in production of antibiotics and/or siderophores appeared to be the most likely mechanisms involved in take-all suppression. Increases in shoot dry weight over that in the Ggt infested control using mixtures of pseudomonads and actinomycetes ranged from 25% to 87%. Actinomycetes added individually or in mixtures to soil infested with Ggt consistently reduced the severity of the disease to a greater extent than did mixtures of Pseudomonas spp.

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Section: Discussionmentioning

confidence: 66%

“…Fungi showing antagonism to Ggt have been reported (Dewan and Sivasithamparam, 1988;Siegel, 1961;Simon and Sivasithamparam, 1988). Actinomycetes, particularly Streptomyces spp.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Natural suppression of take-all disease of wheat in Montana soils

1994

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“…The destructive hyperparasite, Didymella exitj;ales, pe)letrates the hyphae of Ophiobolus graminis in several ways (11). In one instance, the hyphae of D. exitiales grow toward those of O. graminis and follow them for a way without parasitism being detectable.…”

Section: Mode Of Parasitismmentioning

confidence: 99%