1887

Abstract

Improvement of the taxonomy of the genus and especially of , which is subdivided into more than 125 pathovars, is discussed. Recent contributions to the taxonomy of are reviewed, and on the basis of these data and unpublished data from several laboratories, the usefulness of different phenotypic, chemotaxonomic, and genotypic techniques is discussed. The heterogeneity of several X. pathovars has been demonstrated by sodium dodecyl sulfate electrophoresis of whole-cell proteins and fatty acid fingerprinting. The host selectivity of the pathovars is not correlated with their relationships as revealed by DNA-DNA hybridization experiments. In order to reveal the phylogenetic relationships among X. pathovars and their relationships to other species, it will be necessary to perform extensive DNA-DNA homology studies as an essential part of a polyphasic approach. At present, six DNA homology groups within have been delineated. A systematic approach to improve the taxonomy of the genus is proposed.

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1990-07-01
2024-04-25
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