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  • 1
    ISSN: 1573-1561
    Keywords: Balsam poplar ; Populus balsamifera ; snowshoe hare ; Lepus americanus ; plant chemical defense ; herbivore ; cineol ; benzyl alcohol ; bisabolol ; 6-hydroxycyclohexenone ; salicaldehyde
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Palatabilities of parts and growth stages of balsam poplar (Populus balsamifera) to snowshoe hares (Lepus americanus) are related to concentrations of specific plant metabolites that act as antifeedants. Buds are defended from hares by cineol, benzyl alcohol, and (+)-α-bisabolol. Internodes are defended by 6-hydroxycylohexenone (6-HCH) and salicaldehyde. Although defense of interaodes depends upon both compounds, the defense of juvenile internodes is principally related to salicaldehyde concentration; the defense of internode current annual growth is principally related to 6-HCH concentration. The concentration of 6-HCH can be supplemented by the hydrolysis of phenol glycosides when plant tissue is disrupted, raising the possibility of a dynamic element of the chemical defense of poplar.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1939
    Keywords: Carbon/nutrient balance hypothesis ; Plant defense ; Snowshoe hare ; Balsam poplar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The carbon/nutrient balance hypothesis fails to correctly predict effects of fertilization and shading on concentrations of defensive metabolites in Alaskan balsam poplar (Populus balsamifera). Of six metabolites analyzed, only one responded in the predicted fashion to fertilization and one to shading. These results and those of other similar studies suggest that while the carbon/nutrient balance hypothesis may correctly predict the effects of fertilization and shading on the concentrations of metabolic “end products”, it fails for many metabolites because of the dynamics associated with their production and turnover. In metabolites that turn over, static concentration is a poor predictor of defensive investment.
    Type of Medium: Electronic Resource
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