Phylum Actinobacteria, Class Actinobacteria, Order Actinomycetales, Suborder Corynebacterineae, Family Nocardiaceae, Genus
Rhodococcus, Rhodococcus fascians (Tilford 1936) Goodfellow 1984, comb. nov.
Historical synonyms: Corynebacterium fascians (Tilford 1936) Dowson 1942, "Phytomonas fascians" Tilford 1936, "Bacterium
fascians" (Tilford 1936) Lacey 1939, "Pseudobacterium fasciens" (Tilford 1936) Krasil'nikov 1949, Rhodococcus luteus (ex Söhngen
1913) Nesterenko et al. 1982.
Gram-positive with strongly stained granules, slightly curved rods, 0.5-0.9 / 1.5-4.0 µm,
occurring singly, angularly and as palisades; bending and snapping division.
Colonies are opaque, convex, moist, semi-fluidal and cream to yellow on nutrient
agar. Stable, rough, matt variants, not associated with loss of virulence, occur.
Thirteen carotenoid pigments have been identified. Slow growth - colonies on nutrient
dextrose agar have < 1 mm diameter after 3 days. Thiamine is an essential growth
factor. Grows at 37 ºC maximum, 24-27 ºC optimum.
Isolated from plants.
Plant pathogen: causes hypertrophies of stems, a fasciation disease of many plants.
- 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,
Positive results for urease and negative results for aesculin hydrolysis.
(c) Costin Stoica