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Effects of stilbenes from bark of <Emphasis Type="Italic">Picea glehnii</Emphasis> (Sieb. et Zucc) and their related compounds against feeding behaviour of <Emphasis Type="Italic">Reticulitermes speratus</Emphasis> (Kolbe)
Authors:Email author" target="_blank">Sakae?ShibutaniEmail author  Masahiro?Samejima  Shuichi?Doi
Institution:(1) Institute of Wood Technology, Akita Prefectural University, Noshiro 016-0876, Japan;(2) Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, University of Tokyo, Tokyo 113-8657, Japan
Abstract:The effects of stilbene glucosides and related compounds on termite feeding behavior were investigated using paper disc methods against the subterranean termite Reticulitermes speratus. The stilbene-rich fraction and isorhapontin (3prime-methoxy-3,4prime, 5-trihydroxystilbene-3-beta-d-glucoside) from bark extracts of Picea glehnii showed avoidance by termites in choice tests. In the no-choice tests using compounds purified from the stilbene-rich fraction, the largest feeding deterrent effect was observed for piceid (3,4prime,5-trihydroxystilbene-3-beta-d-glucoside), followed by isorhapontin, and astringin (3,3prime,4prime,5-tetrahydroxystilbene-3-beta-d-glucoside), at the concentrations from 0.63 to 2.5thinspµmol/disc. No change in activity was observed at retentions of more than 5.0thinspµmol/disc. When the activities of isorhapontin and its aglycone derivative (isorhapontigenin: 3prime-methoxy-3,4prime,5-trihydroxystilbene) were compared with that of taxifolin (3,3prime,4prime,5,7-pentahydroxyflavanone) in the no-choice test, the stilbenes exhibited a larger antifeedant potential. Methylation of isorhapontigenin increased its termiticidal activity.Part of this study was presented at the 32nd Annual Meeting of the International Research Group on Wood Preservation, 2001
Keywords:Stilbenes                  Picea glehnii                Bark  Termite  Antitermite activity
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