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The influence of chemical factors on the selectivity of pinus resinosa stumps for fomes annosus 2. chemical analysis of extractives obtained from pinus resinosa after wounding and their affect on fomes annosus in vitro



The influence of chemical factors on the selectivity of pinus resinosa stumps for fomes annosus 2. chemical analysis of extractives obtained from pinus resinosa after wounding and their affect on fomes annosus in vitro



European Journal of Forest Pathology 10(1): 1-16



Compounds such as resins or phenols produced by the host in response to wounding or fungal penetration may play an important role as factors of resistance against F. annosus. By extracting stem sections that were kept for different intervals in a closed chamber with different organic solvents chloroform produced the most inhibitory extractives against F. annosus. This may explain at least partially the decreasing stump selectivity for F. annosus. Three compounds were isolated from the neutral fractions of chloroform extractives from 24 days wounded wood discs which were different from the compounds in normal and 12 days fractions. Spectrophotometric analyses revealed some characteristics of these isolated compounds.

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