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Plant Phenolics as Dietary Antioxidants for Herbivorous Insects: A Test with Genetically Modified Tobacco

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Abstract

High foliar phenolics are generally assumed to increase resistance to insect herbivores, but recent studies show that tobacco lines modified to over– and underexpress phenolics do not exhibit higher constitutive resistance to caterpillars. This is contrary to the expectation that ingestion of tobacco phenolics, particularly chlorogenic acid, should cause oxidative stress in herbivores. We investigated free radical production and antioxidant capacity of fresh crushed leaves of tobacco lines exhibiting over a sixfold difference in chlorogenic acid content to test whether high phenolic concentrations are associated with increased production of reactive oxygen species (ROS). The effects of in planta phenolic levels on feeding behavior, growth, biochemical markers of oxidative stress, and the antioxidant capacity of midgut fluid and hemolymph were assessed in tobacco budworm, Heliothis virescens. The experiments showed that high phenolic foliage was more prooxidant than low phenolic foliage, but the net balance in crushed tissue was antioxidant in comparison to buffer and the commercial antioxidant standard, Trolox. In H. virescens, the antioxidant capacity of midgut fluid was also powerful, and caterpillars fed high phenolic foliage did not exhibit the expected markers of oxidative stress in midgut tissues (altered ascorbate ratios, disulfides, or total hydroperoxides). Instead, hemolymph of larvae fed high phenolic foliage exhibited improved total Trolox equivalent antioxidant capacity (TEAC). These results suggest that the elevated foliar phenolics in some plants may have beneficial antioxidant properties for herbivorous insects, much as dietary phenolics do in mammals.

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  1. Department of Biological Sciences, Ohio University, Athens, Ohio, 45701

    Kelly S. Johnson

  2. Department of Entomology, Pennsylvania State University, 501 ASI Building, University Park, Pennsylvania, 16802

    Gary W. Felton

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Johnson, K.S., Felton, G.W. Plant Phenolics as Dietary Antioxidants for Herbivorous Insects: A Test with Genetically Modified Tobacco. J Chem Ecol 27, 2579–2597 (2001). https://doi.org/10.1023/A:1013691802028

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