The genus Xanthomonas consists of 20 plant-associated species, many of which cause important diseases of crops and ornamental plants. Individual species comprise multiple pathovars, characterized by distinctive host specificity or mode of infection. Genomics is at the center of a revolution in Xanthomonas biology. Complete genome sequences are available for nine Xanthomonas strains, representing three species and five pathovars, including vascular and non-vascular pathogens of the important models for plant biology, Arabidopsis thaliana and rice. With the diversity of complete and pending Xanthomonas genome sequences, the genus has become a superb model for understanding functional, regulatory, epidemiological, and evolutionary aspects of host- and tissue-specific plant pathogenesis.
Further reading: Damien F. Meyer and Adam J. Bogdanove Chapter 7 in Plant Pathogenic Bacteria

Furthermore, Xanthomonas strains produce the acidic exopolysaccharide xanthan gum. Because of its physical properties, xanthan gum is widely used as a viscosifer, thickener, emulsifier or stabilizer in both food and non-food industries.
Further reading: Anke Becker and Frank-Jörg Vorhölter Chapter 1 in Microbial Production of Biopolymers and Polymer Precursors

Labels: bacteriology, bacterium, biopolymers, biotechnology, xanthan, xanthomonas