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You searched for: Journal Journal of chemical ecology Remove constraint Journal: Journal of chemical ecology Publication Year 2008 Remove constraint Publication Year: 2008 Source 2008 v.34 no.6 Remove constraint Source: 2008 v.34 no.6 Subject pest resistance Remove constraint Subject: pest resistance
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1. Antifeedant and Phytotoxic Activity of the Sesquiterpene p-Benzoquinone Perezone and Some of its Derivatives

Author:
Burgueño-Tapia, Eleuterio; Castillo, Lucia; González-Coloma, Azucena; Joseph-Nathan, Pedro
Source:
Journal of chemical ecology 2008 v.34 no.6 pp. 766-771
ISSN:
0098-0331
Subject:
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
Abstract:
... 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 ...
DOI:
10.1007/s10886-008-9495-2

2. Colored and White Sectors From Star-Patterned Petunia Flowers Display Differential Resistance to Corn Earworm and Cabbage Looper Larvae

Author:
Johnson, Eric T.; Berhow, Mark A.; Dowd, Patrick F.
Source:
Journal of chemical ecology 2008 v.34 no.6 pp. 757
ISSN:
0098-0331
Subject:
Helicoverpa zea; Trichoplusia ni; larvae; Petunia hybrida; pest resistance; resistance mechanisms; flowers; color; chemical constituents of plants; anthocyanins; mortality; antifeeding activity; body weight
Abstract:
... 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 ...
Handle:
10113/22813
DOI:
10.1007/s10886-008-9444-0
PubMed:
18484139

3. Oxidation of Ingested Phenolics in the Tree-Feeding Caterpillar Orgyia leucostigma Depends on Foliar Chemical Composition

Author:
Barbehenn, Raymond; Weir, Quentin; Salminen, Juha-Pekka
Source:
Journal of chemical ecology 2008 v.34 no.6 pp. 748-756
ISSN:
0098-0331
Subject:
phytophagous insects; food plants; proanthocyanidins; Orgyia leucostigma; chemical constituents of plants; quinones; free radicals; oxidative stress; trees; ascorbic acid; oxidation; larvae; pest resistance; leaves
Abstract:
... 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 ...
DOI:
10.1007/s10886-008-9478-3