title: Chemical defense ofPopulus balsamifera: A Clarification.
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.
authors.affiliation: Department of Chemistry, University of Alaska, 99775-0520, Fairbanks, Alaska.
authors.forename: T P
authors.initials: TP
authors.lastname: Clausen
authors.forename: P B
authors.initials: PB
authors.lastname: Reichardt
authors.forename: J P
authors.initials: JP
authors.lastname: Bryant
authors.forename: A R
authors.initials: AR
authors.lastname: Sinclair