Adult Exposure to Bt Toxin Cry1Ac Reduces Life Span and Reproduction of Resistant and Susceptible Pink Bollworm (Lepidoptera: Gelechiidae)
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Author
Li, XianchunWang, Ling
Wan, Peng
Cong, Shengbo
Wang, Jintao
Huang, Minsong
Tabashnik, Bruce E.
Wu, Kongming
Affiliation
Univ Arizona, Dept EntomolIssue Date
2016-06
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OXFORD UNIV PRESS INCCitation
Wang, Ling, Peng Wan, Shengbo Cong, Jintao Wang, Minsong Huang, Bruce E. Tabashnik, Xianchun Li, and Kongming Wu. "Adult Exposure to Bt Toxin Cry1Ac Reduces Life Span and Reproduction of Resistant and Susceptible Pink Bollworm (Lepidoptera: Gelechiidae)." Journal of economic entomology 109, no. 3 (2016): 1357-1363.Journal
JOURNAL OF ECONOMIC ENTOMOLOGYRights
© The Authors 2015. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Insecticidal proteins from Bacillus thuringiensis (Bt) are used widely in sprays and transgenic plants to control insect pests. Although much research has elucidated the effects of Bt toxins on larvae, relatively little is known about their effects on adults. Here, we evaluated the effects of exposing adults to Bt toxin Cry1Ac on the life span and reproduction of two strains of pink bollworm (Pectinophora gossypiella (Saunders)). In larval diet bioassays, the concentration of Cry1Ac killing 50% of larvae (LC50) was 640 times higher for the laboratory-selected resistant strain (AZP-R) than the susceptible strain (APHIS-S). In experiments with adults, the highest concentrations of Cry1Ac tested (160 and 640 mu g Cry1Ac per ml of 5% honey water) reduced life span for both strains. Treatments with 10, 40, and 160 mg Cry1Ac per ml reduced the duration of the oviposition period as well as the number of eggs laid by both strains, but did not affect the percentage of pairs producing eggs, the duration of the preoviposition period, or the percentage of eggs hatching for either strain. Adult life span did not differ between strains at low to moderate concentrations of Cry1Ac, but it was significantly greater for the resistant strain than the susceptible strain at the two highest concentrations of Cry1Ac tested. The reduced susceptibility to high concentrations of Cry1Ac in adults of the AZP-R strain relative to the APHIS-S strain provides the first evidence of expression of resistance to a Bt toxin in adult Lepidoptera.Note
First published online: 1 May 2016. 12 month embargo.ISSN
0022-0493Version
Final accepted manuscriptSponsors
National Natural Science Foundation of China [30625028, 31321004]Additional Links
http://jee.oxfordjournals.org/content/early/2016/04/30/jee.tow039ae974a485f413a2113503eed53cd6c53
10.1093/jee/tow039