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Applied and Environmental Microbiology, December 2007, p. 7744-7746, Vol. 73, No. 23
0099-2240/07/$08.00+0     doi:10.1128/AEM.01510-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Improving the Insecticidal Activity against Resistant Culex quinquefasciatus Mosquitoes by Expression of Chitinase Gene chiAC in Bacillus sphaericus{triangledown}

Yajun Cai,1,2 Jianpin Yan,1 Xiaomin Hu,1 Bei Han,1 and Zhiming Yuan1*

State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China,1 Graduate School of the Chinese Academy of Sciences, Beijing 100039, China2

Received 5 July 2007/ Accepted 5 October 2007

Expression of a chitinase gene, chiAC, from Bacillus thuringiensis in B. sphaericus 2297 using the binary toxin promoter yielded a recombinant strain that was 4,297-fold more toxic than strain 2297 against resistant Culex quinquefasciatus. These results show that this chitinase can synergize the toxicity of the binary toxin against mosquitoes and thus may be useful in managing mosquito resistance to B. sphaericus.

* Corresponding author. Mailing address: Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China. Phone: 86-27-87197242. Fax: 86-27-87198120. E-mail: yzm{at}pentium.whiov.ac.cn

{triangledown} Published ahead of print on 12 October 2007.

Applied and Environmental Microbiology, December 2007, p. 7744-7746, Vol. 73, No. 23
0099-2240/07/$08.00+0     doi:10.1128/AEM.01510-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.





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