Taxonomy
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References
Phylum Actinobacteria, Class Actinobacteria , Subclass Actibacteridae, Order Actynomycetales, Suborder Micrococcinae, Family
Microbacteriaceae, Genus Rathayibacter,
Rathayibacter iranicus (Carlson and Vidaver 1982) Zgurskaya, Evtushenko, Akimov and
Kalakoutskii 1993, comb. nov.

Historical synonyms:
Corynebacterium iranicum (ex Scharif 1961) Carlson and Vidaver 1982, Clavibacter iranicus (Carlson and
Vidaver 1982) Davis et al. 1984,
Corynebacterium iranicum Scharif 1961.
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. Can grow in 0.030% potassium tellurite.
Obligate parasite of wheat (Triticum aestivum).
Pathogenic, causes a gumming disease of inflorescences of wheat (Triticum aestivum).
  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:
galactose, mannose & xylose.

Negative results for casein hydrolysis, gelatinase, hippurate hydrolysis, lipase, methyl red reduction, nitrate reduction, starch
hydrolysis, tyrosine hydrolysis, Tween 60, 65, 80 hydrolysis, urease, Voges-Proskauer reaction, acid production from: dulcitol,
fructose, glucose, inositol, lactose, maltose, melibiose, rhamnose, ribose, sorbitol & sucrose.

Variable results for acid production from: inulin, mannitol & melezitose.
Rathayibacter iranicus
(c) Costin Stoica
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