SUMMARY: The production by a number of strains of pv. of compounds that inhibit the growth of is reported. A high proportion of pv. strains from and spp. produced the compounds responsible for this effect, whereas the proportion of producers amongst strains from spp., spp. or was low, and amongst strains from spp., or spp. was zero. This specificity in production may be a useful taxonomic feature.

The inhibition of was prevented non-specifically by several basic amino acids, but not by the tripeptide triglycine, indicating that the compound may enter by the basic amino acid uptake system. There is no obvious relationship between this toxin and phaseolotoxin, syringomycin or syringotoxin.


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