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Reaction of Armillaria ostoyae to forest soil microfungi

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Fungi isolated from the oak (Quercus robur) rhizosphere were tested for their effects on rhizomorph formation and growth of 16 isolates of Armillaria ostoyae sampled in three localities in western Poland. The number of rhizomorphs, number of rhizomorph apices, and rhizomorph length and weight increased most in the presence of Penicillium lanosum, Penicillium notatum, Cylindrocarpon destructans, Penicillium spinulosum and Mycelium radicis atrovirens α and, to a lesser extent, in the presence of Nectria grammicospora. Inhibition of rhizomorph formation was caused by Trichoderma hamatum and Trichoderma viride in two A. ostoyae isolates and by M. radicis atrovirens α and P. spinulosum in one A. ostoyae isolate. It is suggested that variation in sensitivity to microbial stimulation within A. ostoyae is associated with the environmental and nutritional conditions of its original habitat. Isolates from nutrition-rich localities, with 20% of the land area covered by deciduous trees, were particularly susceptible to stimulation by rhizosphere fungi.
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Document Type: Research Article

Affiliations: 1: Department of Forest Pathology, Academy of Agriculture, ul. Wojska Polskiego 71c, 60-625 Poznań, Poland 2: Canadian Forest Service, Northern Forestry Centre 5320 122 St, Edmonton, Alberta T6H 3S5, Canada

Publication date: 2004-06-01

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