Sulfonylurea resistance as a new selectable marker for the entomopathogenic fungus Beauveria bassiana |
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Authors: | Shizhu Zhang Yanhua Fan Yu Xian Xia Nemat O. Keyhani |
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Affiliation: | (1) Genetic Engineering Research Center, College of Bioengineering, Chongqing University, Chongqing, China;(2) Department of Microbiology and Cell Science, University of Florida, Bldg 981, Museum Rd., Gainesville, FL 32611, USA; |
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Abstract: | Beauveria bassiana is a filamentous ascomycete that is pathogenic towards a broad host range of insect targets and is increasingly serving as a model for examining fungal development and host-pathogen interactions. B. bassiana displays a prohibitive level of resistance against many current fungal and/or yeast selection markers including hygromycin, neomycin, and zeocin. A genetic transformation system for B. bassiana based upon the use of a sulfonylurea resistance cassette derived from the Magnaporthe grisea, acetolactate synthase gene (sur) was developed. The transformation frequency ranged from 100–150 transformants per microgram DNA/108 cells and Southern blot analysis indicated that the plasmid vector was randomly integrated into the genome of B. bassiana. In addition, a construct bearing the sur gene and the enhanced green fluorescent protein gene egfp as a visual marker was used to successfully transform B. bassiana. Over 95% of the transformants retained the sulfonylurea resistance phenotype under non-selective conditions. The described transformation method increases opportunities for the genetic manipulation of B. bassiana. |
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