| Autor: |
Roy, G., Bussières, G., Laflamme, G., Dessureault, M. |
| Předmět: |
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| Zdroj: |
Forest Pathology; Dec2001, Vol. 31 Issue 6, p395, 10p |
| Abstrakt: |
The antagonistic fungus Phaeotheca dimorphospora has been tested in vitro on agar plates and wood discs to evaluate its potential use against P (Eastern Canada) and S (Finland) intersterility groups strains of Heterobasidion annosum using two methods. Production of antifungal metabolites by P. dimorphospora was demonstrated on agar plates as well as on Pinus resinosa and Picea abies discs using the bi-layer technique. Diffusible metabolites inhibited the growth of the pathogen on both substrates. Direct confrontation on wood discs showed that a 7-day period of advanced growth by P. dimorphospora completely prevented the colonization of the tissue by H. annosum. Control was partial when the antagonist had only one day of advanced growth. Growth inhibition was superior against S group strains with less than 1% of the samples colonized by H. annosum compared with 22% for P group strains. Moreover, P. dimorphospora was isolated in more than 83% of the samples in the absence of the pathogen in both wood species. In vitro tests demonstrated that P. dimorphospora is able to colonize red pine as well as Norway spruce tissue and to use wood components for the production of antifungal metabolites. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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Plný text