Antifeedant activity of flavonoids and related compounds against the subterranean termiteCoptotermes formosanus Shiraki |
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| Authors: | Wakako Ohmura Shuichi Doi Masakazu Aoyama Sciji Ohara |
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| Institution: | (1) Forestry and Forest Products Research Institute, Tsukuba Norin Kenkyu Danchi-nai, PO Box 16, 305-8687 Ibaraki, Japan;(2) Institute of Wood Technology, Akita Prefectural University, 016-0876 Noshiro, Japan;(3) Hokkaido Forest Products Research Institute, 071-0198 Asahikawa, Japan |
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| Abstract: | Antifeedant activity of some flavonoids and their related compounds against the subterranean termiteCoptotermes formosanus Shiraki was examined with nochoice tests and two-choice tests. The activities of these compounds were evaluated in relation to their chemical structures. All flavonoids tested showed antifeedant activity, whereas catechinic acid, possessing no A-ring or pyran ring in the molecule, showed feeding-preference activity. For the structure-activity relations, it was found that compounds containing two hydroxyl groups at C-5 and C-7 in A-rings showed high antifeedant activity. Furthermore, the presence of a carbonyl group at C-4 in the pyran rings of the compounds was necessary for the occurrence of high activity. 3-Hydroxyflavones and 3-hydroxyflavanones with 3 ,4-dihydroxylated B-rings exhibited higher activity than those with 4-hydroxylated B-rings.Part of this paper was presented at the 49th annual meeting of the Japan Wood Research Society, Tokyo, April 1999 |
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| Keywords: | Flavonoids Termite Antifeedant activity Structure-activity relations |
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