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Xanthomonadales ord. nov.

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Gram-negative straight rods lacking prosthecae; hyaline stalks found in one genus (Nevskia). Endospores are not produced, no accumulation of poly-β-hydroxybutyrate inclusions. Motile with polar flagellation, flexing/gliding (Lysobacter), or nonmotile. Obligate aerobes, having a strictly respiratory metabolism with oxygen as the terminal electron acceptor. Catalase positive. Nitrate not reduced, with the exception of Stenotrophomonas. Oxidase production varies. Fatty acid profiles are complex; branched chain and/or hydroxy fatty acids are found. Ubiquinone Q8 is generally found. Optimum temperature 20–35°C; except Thermomonas, 37–50°C.


  • Type Strain
  • Xanthomonas Campestris
  • Fatty Acid Methyl Ester Analysis
  • Fatty Acid Data
  • Xylella Fastidiosa

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Further Reading

  • Bradbury, J.F. 1986. Guide to Plant Pathogenic Bacteria, CAB International Mycological Institute, Kew.

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  • Swings, J.G. and E.L. Civerolo (Editors). 1993. Xanthomonas, Chapman & Hall, London.

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  • Vauterin, L. and J. Swings. 1997. Are classification and phytopathological diversity compatible in Xanthomonas? J. Ind. Microbiol. Biotechnol. 19: 77–82.

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Further Reading

  • Swings, J., M. Gillis, K. Kersters, P. De Vos, F. Gosselé and J. De Ley. 1980. Frateuria, a new genus for “Acetobacter aurantius”. Int. J. Syst. Bacteriol. 30: 547–556.

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Further Reading

  • Vauterin, L., J. Swings, K. Kersters, M. Gillis, T.W. Mew, M.N. Schroth, N.J. Palleroni, D.C. Hildebrand, D.E. Stead, E.L. Civerolo, A.C. Hayward, H. Maraîte, R.E. Stall, A.K. Vidaver and J.F. Bradbury. 1990. Towards an improved taxonomy of Xanthomonas. Int. J. Syst. Bacteriol. 40: 312–316.

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Further Reading

  • Hopkins, D.L. 1989. Xylella fastidiosa: xylem-limited bacterial pathogens of plants. Ann. Rev. Phytopathol. 27: 271–290.

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  • Purcell, A.H. 1997. Xylella fastidiosa, a regional problem or global threat? J. Plant Pathol. 79: 99–105.

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  • Purcell, A.H. and D.L. Hopkins. 1996. Fastidious xylem-limited bacterial plant pathogens. Ann. Rev. Phytopathol. 34: 131–151.

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Saddler, G.S., Bradbury, J.F. (2005). Xanthomonadales ord. nov. . In: , et al. Bergey’s Manual® of Systematic Bacteriology. Springer, Boston, MA.

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