Avirulence gene D of Pseudomonas syringae pv. tomato may have undergone horizontal gene transfer
1997
Abstract Avirulence gene D ( avrD ) is carried on the B-plasmid of the plant pathogen Pseudomonas syringae pv. tomato with plasmid-borne avrD homologs widely distributed among the Pseudomonads. We now report sequences in the soft rot pathogen Erwinia carotovora that cross-hybridize to avrD suggesting a conserved function beyond avirulence. Alternatively, avrD may have been transferred horizontally among species: (i) DNA linked to avrD shows evidence of class II transpositions and contains a novel IS 3 -related insertion sequence, and (ii) short sequences linked to avrD are similar to pathogenicity genes from a variety of unrelated pathogens. We have also identified the gene cluster that controls B-plasmid stability.
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