Summary
Greenhouse experiment and nursery investigations were conducted to determine the influence of ectomycorrhizae on the infectivity of conducive soil or substrates artificially infested or colonized byPythium spp.
A standard bioassay method was used to estimate soil infectivity (S.I.) and to follow changes with time under various conditions. S.I. decreased in substrates in which Beech seedlings infected withHebeloma crustuliniforme had grown. Principal component analysis of the data, andin vitro confrontation betweenH. crustuliniforme andPythium ultimum suggest a direct effect of the mycorrhizal species against Pythium. Further investigations are necessary to specify and determine this phenomenon. Such methods may permit the better selection of mycorrhizal strains for protecting tree seedlings against root pathogens.
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References
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Perrin, R., Garbaye, J. Influence of ectomycorrhizae on infectivity of Pythium-infested soils and substrates. Plant Soil 71, 345–351 (1983). https://doi.org/10.1007/BF02182674
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DOI: https://doi.org/10.1007/BF02182674