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The effect of elevated UV-B radiation on herbivory of pea by Autographa gamma.

Hatcher, P. E. and Paul, N. D. (1994) The effect of elevated UV-B radiation on herbivory of pea by Autographa gamma. Entomologia Experimentalis et Applicata, 71 (3). pp. 227-233.

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Abstract

Leaves exposed to above-ambient fluxes of ultraviolet-B (UV-B) radiation commonly contain increased concentrations of phenolic compounds which may influence herbivores. However, the hypothesis that elevated UV-B modifies herbivory, whether mediated by phenolics or other plant constituents, has rarely been studied experimentally. We investigated the responses of the mothAutographa gamma L. (Lepidoptera: Noctuidae) to pea (Pisum sativum L.) grown at a range of plant-effective UV-B fluxes. Although total phenolics did increase significantly with increasing UV-B, this change had little deleterious effect on the 5th instar larvae ofA. gamma. However, tissue nitrogen also increased with increasing UV-B. Increased nitrogen was correlated with an increase in the efficiency with which larvae utilized their food and in larval growth rate, but in a reduction in the amount of plant material consumed. The apparently major role of nitrogen in determining herbivore responses to changing UV-B demonstrates the risks in predicting such responses soley on the basis of changes in phenolics and other secondary metabolites.

Item Type: Article
Journal or Publication Title: Entomologia Experimentalis et Applicata
Uncontrolled Keywords: ultraviolet-B radiation - herbivory - Pisum sativum - nutritional indices - Autographa gamma
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 22447
Deposited By: ep_ss_importer
Deposited On: 29 Jan 2009 16:21
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:01
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/22447

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