Abstract
The internal taxonomic structure and the suprageneric relations of the causal agent of bacterial blight and canker of grapevine, the misnamed Xanthomonas ampelina, were examined. By studying more than 30 strains of different geographical origin by polyacrylamide gel electrophoresis and DNA: DNA hybridization, we established the homogeneity of X. ampelina. [14C]‐labelled ribosomal RNA (rRNA) was prepared from the type strain of X. ampelina (NCPPB 2217) and hybridized with DNA from different representative strains from the Pseudomonas acidovorans rRNA complex in rRNA superfamily III. X. ampelina was found to be a separate branch in rRNA superfamily III, related at a suprageneric level to P. acidovorans, Alcaligenes paradoxus and the other organisms of the P. acidovorans rRNA complex.
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