Formation and characterization of a highly UV-resistant and mosquitocidal Bacillus thuringiensis mutant

ZHANG Xiaojuan; Zhang Yi; Zheng Xiaojuan; Qian GuiPing; Guan Xiong; ZHANG Lingling

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Formation and characterization of a highly UV-resistant and mosquitocidal Bacillus thuringiensis mutant

ZHANG Xiaojuan,Zhang Yi,Zheng Xiaojuan,Qian GuiPing,Guan Xiong,ZHANG Lingling *

Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China

*Correspondence author

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Funding: This work was supported by National High-tech R and D Program of China （No.863 Program, Grant No. 2011AA10A203), National Natural Science Foundation of China）

Opened online:28 May 2014

Accepted by: none

Citation: ZHANG Xiaojuan,Zhang Yi,Zheng Xiaojuan.Formation and characterization of a highly UV-resistant and mosquitocidal Bacillus thuringiensis mutant[OL]. [28 May 2014] http://en.paper.edu.cn/en_releasepaper/content/4598102

UV mutagenesis, one of the most commonly used mutation methods, is used extensively in microbial mutation breeding. This study reports that a mutant of Bacillus thuringiensis named LLP29-M19, obtained from 19 rounds of UV exposure, could resist ultraviolet radiation up to 67 min. The mosquitocidal fatality rate (95%) of LLP29-M19 was slightly higher than LLP29 (90%). Characterization of the novel mutation revealed that LLP29-M19 exhibited no substantial changes in morphology, plasmids profile and protein profiles compared with LLP29. Its physiological and biochemical characteristic reactions, however, reflect some changes including fructose, glucose, xylose, mushroom, anaerobic sugar glucose and MacConkey Agar. This method of improving the UV resistance of Bt avoids the effects of external additive on strains. Meanwhile it was safe and effective and yielded significant ecological and economic benefits.

Keywords:Bacillus thuringiensis; UV mutagenesis; Mosquitocidal activity; Biological property

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