Invasive Species Compendium

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Abstract

Characteristics of Rhodococcus fascians strains isolated from Petunia and Geranium in Tehran and Semnan provinces.

Abstract

Eighteen strains of Rhodococcus fascians were isolated from Petunia hybrida and PelargoniumĂ—hortorum plants with leafy gall symptoms in the Tehran and Semnan provinces of Iran. Strains isolated from Petunia were fairly homogeneous with phenotypic features, electrophoretic profiles of cell proteins, and TLC patterns of polar lipids and isoprenoid quinones, similar to the reference strains of R. fascians. There were considerable differences in phenotypic characteristics and protein profiles between the type strain and the strains isolated from Geranium. The latter strains could be differentiated from the type and Petunia strains by their polar lipids patterns and their ability to hydrolyze esculin and arbutin and to utilize arabitol, arabinose, inositol, sorbose, rhamnose and D-tartrate. Several plant species including beet (Beta vulgaris) were susceptible and displayed fasciation or leafy gall symptoms following inoculation with representatives of both groups of strains. Infection in beet resulted in proliferation of abnormal buds and leaves on the crown and retarded normal development of roots.