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Applied and Environmental Microbiology, July 2001, p. 3216-3219, Vol. 67, No. 7
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.7.3216-3219.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Cross-Resistance and Stability of Resistance to Bacillus thuringiensis Toxin Cry1C in Diamondback Moth

Yong-Biao Liu,1,* Bruce E. Tabashnik,1 Susan K. Meyer,1 and Neil Crickmore2

Department of Entomology, University of Arizona, Tucson, Arizona 85721,1 and School of Biological Sciences, University of Sussex, Brighton, United Kingdom2

Received 22 January 2001/Accepted 2 May 2001

We tested toxins of Bacillus thuringiensis against larvae from susceptible, Cry1C-resistant, and Cry1A-resistant strains of diamondback moth (Plutella xylostella). The Cry1C-resistant strain, which was derived from a field population that had evolved resistance to B. thuringiensis subsp. kurstaki and B. thuringiensis subsp. aizawai, was selected repeatedly with Cry1C in the laboratory. The Cry1C-resistant strain had strong cross-resistance to Cry1Ab, Cry1Ac, and Cry1F, low to moderate cross-resistance to Cry1Aa and Cry9Ca, and no cross-resistance to Cry1Bb, Cry1Ja, and Cry2A. Resistance to Cry1C declined when selection was relaxed. Together with previously reported data, the new data on the cross-resistance of a Cry1C-resistant strain reported here suggest that resistance to Cry1A and Cry1C toxins confers little or no cross-resistance to Cry1Bb, Cry2Aa, or Cry9Ca. Therefore, these toxins might be useful in rotations or combinations with Cry1A and Cry1C toxins. Cry9Ca was much more potent than Cry1Bb or Cry2Aa and thus might be especially useful against diamondback moth.

* Corresponding author. Present address: USDA, ARS, US Agricultural Research Station, 1636 East Alisal St., Salinas, CA 93905. Phone: (831) 755-2825. Fax: (831) 755-2814. E-mail: yb_liu{at}yahoo.com.

Applied and Environmental Microbiology, July 2001, p. 3216-3219, Vol. 67, No. 7
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.7.3216-3219.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:

  • Gonzalez-Cabrera, J., Herrero, S., Sayyed, A. H., Escriche, B., Liu, Y. B., Meyer, S. K., Wright, D. J., Tabashnik, B. E., Ferre, J. (2001). Variation in Susceptibility to Bacillus thuringiensis Toxins among Unselected Strains of Plutella xylostella. Appl. Environ. Microbiol. 67: 4610-4613 [Abstract] [Full Text]  


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