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Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Corynebacterinae, Family
Microbacteriaceae, Genus Rathayibacter,
Rathayibacter rathayi (Smith 1913) Zgurskaya, Evtushenko, Akimov and Kalakoutskii  1993,
comb. nov.

Historical synonyms:
Clavibacter rathayi (Smith 1913)  Davis, Gillaspsie Jr., Vidaver and Harris 1984,  Corynebacterium rathayi
(Smith 1913) Dowson 1942,  
Aplanobacter rathayi Smith 1913, Bacterium rathayi (Smith 1913) Aujeszky 1914, Phytomonas rathayi
(Smith 1913) Bergey et al. 1923,
Erwinia rathayi (Smith 1913) Gram et al. 1929, Agrobacterium rathayi (Smith 1913) Savulescu 1947,
Pseudobacterium rathayi (Smith 1913) Krasil'nikov 1949.
Gram-positive short rods with bluntly rounded ends, 0.5-0.75 / 0.95-1.3 µm, usually
singly or in pairs joined end to end. Non-motile. Non-spore-forming. Mycolic acids are
not present.
Grows very poorly on nutrient agar, heavier on nutrient glucose agar; grows only when
densely seeded. Growth is better and faster on cooked potato. Colonies differ in size,
are bright yellow, opaque, entire and convex. Obligately aerobic.
Grows at 16-35 ºC, optimum at 24-28 ºC. No growth at 10 or 37 ºC. No growth in 5%
NaCl media. Variable growth in 0.030% potassium tellurite.
Isolated from cocksfoot grass (Dactylis glomerata). Susceptible to iranicin (bacteriocin of  Rathayibacter iranicus).
Pathogenic, causes a gumming disease of inflorescences of cocksfoot grass (Dactylis glomerata).
  1. Cummins C.S., Lelliott R.A. and Rogosa M., 1975. Genus Corynebacterium Lehmann and Neumann 1896 . In: Buchanan R.E.
    and Gibbons N.E. (Editors), Bergey’s Manual of Determinative Bacteriology, Eight Edition, The Williams & Wilkins Company,
    Baltimore, 602-617.
  2. Holt J.G., Krieg N.R., Sneath P.H.A., Staley J.T. and Williams S.T., 1994. Bergey's Manual of Determinative Bacteriology, Ninth
    Edition, Williams & Wilkins, A Waverly Company, Baltimore, pp 571-596.
  3. Davis M.J., Gillaspie Jr. A.G., Vidaver A.K. and Harris R.W., 1984. Clavibacter: a New Genus Containing Some Phytopathogenic
    Coryneform Bacteria, Including Clavibacter xyli subsp. xyli sp. nov., subsp. nov. and Clavibacter xyli subsp. cynodontis subsp.
    nov., Pathogens That Cause Ratoon Stunting Disease of Sugarcane and Bermudagrass Stunting Disease. IJSB Vol. 34, No. 2, p.
    107-117.
  4. Carlson R.R. and Vidaver A.K., 1982. Taxonomy of Corynebacterium Plant Pathogens, Including a New Pathogen of Wheat, Based
    on Polyacrylamide Gel Electrophoresis of Cellular Proteins. IJSB Vol. 32, N0. 3, p. 315-326.
  5. Zgurskaya H.I., Evtushenko L.I., Akimov V.N. and Kalakoutskii L.V. 1993. Rathayibacter gen. nov., Including the Species
    Rathayibacter rathayi comb.  nov., Rathayibacter tritici comb. nov., Rathayibacter iranicus comb. nov., and Six Strains from Annual
    Grasses. Int. J. Syst. Bacteriol. Vol. 43, No.1, 143-149.
Non-acid-fast.

Positive results for catalase, citrate utilisation, esculin hydrolysis, H
2S production, Tween 21, 40, 85 hydrolysis, acid production from
xylose.

Negative results for casein hydrolysis, hippurate hydrolysis, lipase, nitrate reduction, tyrosine hydrolysis, Tween 60, 65, 80 hydrolysis,
urease, acid production from: dulcitol, galactose, glucose, inositol, inulin, lactose, maltose, mannose, melezitose, melibiose,
rhamnose, ribose, sorbitol & sucrose.

Variable results for gelatinase, methyl red, starch hydrolysis, Voges-Proskauer reaction, acid production from fructose & mannitol.
Rathayibacter rathayi
(c) Costin Stoica
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