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Title Impact of UV radiation on activity of linear furanocoumarins and Bacillus thuringiensis var. kurstaki against Spodoptera exigua: Implications for tritrophic interactions
Creator/Author Trumble, J.T. ; Moar, W.J. ; Brewer, M.J. ; Carson, W.G. (Univ. of California, Riverside (United States))
Publication Date1991 May 01
OSTI IdentifierOSTI ID: 5697752
Other Number(s)ISSN0098-0331; CODEN: JCECD
Resource TypeJournal Article
Resource RelationJournal of Chemical Ecology ; Vol/Issue: 17:5
Subject560130 -- Radiation Effects on Microorganisms; BACILLUS-- INFECTIVITY;MOTHS-- SURVIVAL TIME;PSORALEN-- RADIOSENSITIVITY EFFECTS; AGRICULTURE;BIOLOGICAL RADIATION EFFECTS;LARVAE;ULTRAVIOLET RADIATION
Related SubjectANIMALS;ANTICOAGULANTS;ARTHROPODS;BACTERIA;BIOLOGICAL EFFECTS;COUMARINS;DRUGS;ELECTROMAGNETIC RADIATION;HEMATOLOGIC AGENTS;HETEROCYCLIC COMPOUNDS;INDUSTRY;INSECTS;INVERTEBRATES;LEPIDOPTERA;MICROORGANISMS;ORGANIC COMPOUNDS;ORGANIC OXYGEN COMPOUNDS;RADIATION EFFECTS;RADIATIONS
Description/Abstract Acidic fogs with a pH of 2.0 and duration of 2 hr did not reduce the efficacy of Bacillus thuringiensis var. kurstaki.^Therefore, the impact of UV radiation was investigated on the interactions between (1) levels of the antibacterial linear furanocoumarins psoralen, bergapten, and xanthotoxin in Apium graveolens (L.) occurring following a 2.0 pH acidic fog episode, (2) the noctuid Spodoptera exigua, and (3) a sublethal dosage of the microbial pathogen B. thuringiensis var. kurstaki.^Mean time to pupation in the absence of UV radiation was significantly extended by the addition of either psoralens or B. thuringiensis.^Larvae developing on diets containing B. thuringiensis plus psoralens required nearly 40% longer to pupate than controls, but their effects were additive as the interaction was not significant.^Mean time to mortality, a weighted average time of death, was not significantly affected by any of the treatments.^In a 2 {times} 2 {times} 2 factorial analysis, all main effects reduced survival significantly, as did the three-way interaction.^Thus, antagonistic interactions with psoralens that would reduce the effectiveness of B. thuringiensis in the field were not observed.^When pairs of main effects were nested within the two levels of the third factor, several two-way interactions were found.^Interestingly, the activity of B. thuringiensis and the psoralens, individually or in combination, was enhanced by exposure to UV radiation.^Implications of this research are discussed for both natural and agricultural ecosystems.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 973-987
System Entry Date2001 May 13

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