Abstract
The avirulence gene avrBs3 from Xanthomonas campestris pv. vesicatoria was cloned and found to be localized on a self-transmissable plasmid. Genetic analysis of an avrBs3 insertion mutation revealed that avrBs3 constitutes a single locus, specifying the resistant phenotype on pepper plants. Southern blot experiments showed that no DNA sequences homologous to avrBs3 were present in other races of X. c. pv. vesicatoria, which are unable to induce a hypersensitive reaction on ECW-30R. However, the DNA of several different pathovars of X. campestris hybridized to the avrBs3 probe. A deletion analysis defined a region of 3.6-3.7 kb essential for avrBs3 activity. The nucleotide sequence of this region was determined. A 3561 nucleotide open reading frame (ORF1), encoding a 125,000 dalton protein, was found in the 3.7 kb region that was sufficient for avrBs3 activity. A second long ORF (2351 nucleotides) was identified on the other strand. A remarkable feature of both ORFs is the presence of 17 direct repeats of 102 bp which share 91%-100% homology with each other.
MeSH Terms
Amino Acid Sequence
Base Sequence
Blotting, Southern
Conjugation, Genetic
DNA Transposable Elements
DNA, Bacterial/genetics
Genes, Bacterial
Molecular Sequence Data
Mutation
Phenotype
Plant Diseases
Plasmids
Repetitive Sequences, Nucleic Acid
Restriction Mapping
Sequence Homology, Nucleic Acid
Transcription, Genetic
Xanthomonas/genetics
Chemicals
DNA Transposable Elements
DNA, Bacterial
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Bonas U
Department of Plant Pathology, University of California, Berkeley 94720.
Stall R E
Staskawicz B
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