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

Historical synonyms:
Corynebacterium tritici (Hutchinson 1917) Carlson and Vidaver 1982, Clavibacter tritici (Carlson and Vidaver
1982) Davis et al. 1984,
Pseudomonas tritici Hutchinson 1917, Corynebacterium tritici (Hutchinson 1917) Burkholder 1948,
Phytomonas tritici (Hutchinson 1917) Bergey, Harrison, Breed, Hammer and Huntoon 1930, Bacterium tritici (Hutchinson 1917) Elliott
1930,
Agrobacterium tritici (Hutchinson 1917) Savulescu 1947.
Gram-positive pleomorphic rods, 0.5-0.75 / 0.95-1.3 µm, usually singly or in pairs
joined end to end. Motility is variable. Non-spore-forming. Mycolic acids are not
present.
Grows slowly. Colonies on nutrient dextrose agar are smaller than 1 mm diameter.
After 3 days colonies are yellow on NBY medium, opaque, 2-4 mm in diameter and
convex. Obligately aerobic.
Grows at 16-34 ºC, optimum at 24-28
ºC. No growth at 10 or 37 ºC. Can grow in 4%
NaCl media, but not in 5%. Can grow in 0.030% potassium tellurite.
Obligate parasite of wheat (Triticum aestivum). Resistant to iranicin (bacteriocin of Rathayibacter iranicus).
Pathogenic, causes a gumming disease of the leaves, stems and 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, Tween 21, 40, 85 hydrolysis, acid production from: cellobiose,
fructose, glucose, glycerol, inulin, maltose, mannitol, mannose, sucrose, trehalose & xylose.

Negative results for casein hydrolysis, gelatinase, hippurate hydrolysis, lipase, nitrate reduction, starch hydrolysis, tyrosine hydrolysis,
Tween 60, 65, 80 hydrolysis, urease, Voges-Proskauer reaction, acid production from: adonitol, dulcitol, esculin, alpha-methyl
glucoside, beta-methyl glucoside, inositol, lactose, melezitose, melibiose, raffinose, rhamnose, ribose, salicin & sorbitol.

Variable results for H
2S production, methyl red reduction, acid production from: galactose.
Rathayibacter tritici
(c) Costin Stoica
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