Order III Xanthomonadales ord nov

Gerard S. Saddler and John F Bradbury

Xan.tho.mo.na.da'les. Xanthomonas type genus of the order; -ales ending to denote order; M.L. fem. pl. n. Xanthomonadales the Xanthomonas order.

Gram-negative straight rods lacking prosthecae; hyaline stalks found in one genus (Nevskia). Endospores are not produced, no accumulation of poly-b-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 Ther-momonas, 37-50°C.

Type genus: Xanthomonas Dowson 1939,187, emend. Vauterin, Hoste, Kersters and Swings 1995, 483.

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