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Localization of transposon insertions in pathogenicity mutants of Erwinia amylovora and their biochemical characterization

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Bellemann,  Peter
Research Group Prof. Dr. Geider, Max Planck Institute for Medical Research, Max Planck Society;

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Geider,  Klaus
Research Group Prof. Dr. Geider, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Bellemann, P., & Geider, K. (1992). Localization of transposon insertions in pathogenicity mutants of Erwinia amylovora and their biochemical characterization. Journal of general microbiology, 138(5), 931-940. doi:10.1099/00221287-138-5-931.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-AB7B-6
Abstract
Transposon Tn5, on a mobilizable ColE1 plasmid, on a Ti plasmid derepressed for bacterial transfer, and on the bacteriophage fd genome, was used to construct pathogenicity mutants of the fire blight pathogen Erwinia amylovora. Eleven nonpathogenic mutants were isolated from 1600 independent mutants screened. These mutants were divided into three types: auxotrophs, exopolysaccharide (EPS)-deficient mutants and a mutant of the dsp phenotype. According to their insertion sites the Tn5 mutants were mapped into several classes. Some of the mutants could be complemented with cosmid clones from a genomic library of the parent strain for EPS production on minimal agar. EPS-deficient mutants and the dsp mutant could complement each other to produce virulence symptoms on pear slices.