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- W2093186425 abstract "Abstract The Fraser fir ( Abies fraseri ) and balsam fir ( Abies balsamea ) are eastern North American conifers which have been infested by an exotic insect, the balsam woolly adelgid (BWA). BWA infestation has had particularly severe effects on Fraser fir, with up to 95% mortality rates at some sites, and is characterized by attack on mature trees only. The purpose of this research was to perform a chemosystematic study to evaluate whether differences in volatile chemical concentrations of various stands of fir were observed as a function of resistance to BWA infestation. The concentrations of volatiles were determined by a methylene chloride extraction procedure, followed by analysis by gas chromatography. First, comparisons were made of concentration levels of volatiles in Fraser and balsam fir foliage of seedlings, saplings, and mature trees. If a chemical provided resistance, one would expect higher volatile levels in the balsam foliage because of its greater resistance to BWA. Second, the volatile levels in Fraser fir saplings and mature trees at uninfested sites were compared to the levels in surviving Fraser fir saplings and mature trees at infested sites. For a compound that provided BWA-resistance, higher volatile levels would be expected at the infested site because of the greater resistance of the surviving trees. Lastly, the concentrations of volatiles in sapling foliage were compared to those in mature foliage, where higher levels of resistance-providing chemicals would be expected in the saplings. 3-Carene was shown to consistently follow the expected pattern for a compound that provides resistance against BWA and β-pinene followed the pattern for the majority of the comparisons. These results indicate that while maltol and total volatiles did not correlate with the expected pattern, 3-carene, and possibly β-pinene and sesquiterpenes may provide fir with defense against BWA infestation." @default.
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- W2093186425 date "2006-07-01" @default.
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- W2093186425 title "Determination of volatile compounds in foliage of Fraser fir (Abies fraseri) and balsam fir (Abies balsamea)" @default.
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- W2093186425 doi "https://doi.org/10.1016/j.microc.2006.03.003" @default.
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