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- Johnson, Eric T.; Berhow, Mark A.; Dowd, Patrick F.
- Journal of chemical ecology 2008 v.34 no.6 pp. 757
- Helicoverpa zea; Trichoplusia ni; larvae; Petunia hybrida; pest resistance; resistance mechanisms; flowers; color; chemical constituents of plants; anthocyanins; mortality; antifeeding activity; body weight
- ... Anthocyanins are likely a visual aid that attract pollinators. However, there is also the possibility that anthocyanins are present in some flowers as defensive molecules that protect them from excess light, pathogens, or herbivores. In this study, resistance due to anthocyanins from commercial petunia flowers (Petunia hybrida) was examined for insecticide/antifeedant activity against corn earworm ...
- 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 ...