Chemical defense ofPopulus balsamifera: A Clarification |
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| Authors: | Thomas P. Clausen Paul B. Reichardt John P. Bryant A. R. E. Sinclair |
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| Affiliation: | (1) Department of Chemistry, University of Alaska, 99775-0520 Fairbanks, Alaska;(2) Institute of Arctic Biology, University of Alaska, 99775-0180 Fairbanks, Alaska;(3) Department of Zoology, University of British Columbia, V6T IZ4 Vancouver, British Columbia, Canada |
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| Abstract: | A previous report that the relative payabilities of juvenile versus maturePopulus balsamifera towards browsing snowshoe hares is due to the presence of 2,4,6-trihydroxydihydrochalcone in the juvenile growth form has been shown to be incorrect. Specifically, 2,4,6-trihydroxydihydrochalcone is present in internodes ofPopulus balsamifera in exceedingly low concentrations (<0.02% wet wt) and its concentrations are not elevated in internodes of the juvenile developmental stage. Its high levels in the buds (20–25% wet wt) ofPopulus balsamifera, however, probably makes it a deterrent substance for herbivores that cannot remove buds from twigs during foraging. |
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| Keywords: | 2,4,6-Trihydroxydihydrochalcone balsam poplar Populus bal samifera snowshoe hare Lepus americanus herbivory plant defense |
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