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- Burgueño-Tapia, Eleuterio; Castillo, Lucia; González-Coloma, Azucena; Joseph-Nathan, Pedro
- Journal of chemical ecology 2008 v.34 no.6 pp. 766-771
- sesquiterpenoids; antifeeding activity; benzoquinones; Spodoptera littoralis; phytotoxicity; Lactuca sativa; Myzus persicae; Leptinotarsa decemlineata; structure-activity relationships; root growth; chemical constituents of plants; pest resistance; root radicle
- ... The sesquiterpene p-benzoquinone perezone (1), isolated from Perezia adnata var. alamani (Asteraceae), and its non-natural derivatives isoperezone (2), dihydroperezone (3), dihydroisoperezone (4), and anilidoperezone (5) were tested as antifeedants against the herbivorous insects Spodoptera littoralis, Leptinotarsa decemlineata, and Myzus persicae. Compounds 1-5 exhibited strong antifeedant activi ...
- Barbehenn, Raymond; Weir, Quentin; Salminen, Juha-Pekka
- Journal of chemical ecology 2008 v.34 no.6 pp. 748-756
- phytophagous insects; food plants; proanthocyanidins; Orgyia leucostigma; chemical constituents of plants; quinones; free radicals; oxidative stress; trees; ascorbic acid; oxidation; larvae; pest resistance; leaves
- ... Tannins are believed to function as antiherbivore defenses, in part, by acting as prooxidants. However, at the high pH found in the midguts of caterpillars, the oxidative activities of different types of tannins vary tremendously: ellagitannins >> galloyl glucoses > condensed tannins. Ingested ascorbate is utilized by caterpillars to minimize phenolic oxidation in the midgut. Thus, leaves that con ...