Abstract
The ubiquinone system of twenty-four strains of ballistospore-forming yeasts in the genera Sporidiobolus, Sporobolomyces, and Bullera was investigated. Most of strains are type strains. They are twenty-one known species and two unidentified species. Sporidiobolus johnsonii, Sporid. pararoseus, Sporid. ruinenii, Sporid. salmonicolor, Sporobolomyces alborubescens, Sp. foliicola, sp. gracilis, Sp. holsaticus, and Sp. Roseus had Q-10 as the major ubiquinone and Q-9 as the minor component. Bullera alba, B. armeniaca, B. aurantiaca, B. crocea, B. dendrophila, B. globospora, B. piricola, B. punicea, B. salicina, B. singularis, and B. tsugae also had Q-10 as the major ubiquinone and Q-9 as the minor component. The amounts of Q-9 are rather high (15.0-25.4%) in Sporid, pararoseus, Sporid. ruinenii, B. piricola, B. punicea, and B. salicina. The major ubiquinone of Sp. elongatus was Q-10 (H2). This yeast has Q-9 (H2) and Q-10 as the minor components. This is the 2nd finding of Q-10 (H2) in yeasts as the major ubiquinone. Three unidentified strains of two species of Bullera had Q-9 as the major ubiquinone and Q-8 and Q-10 as the minor components. Taxonomically, these strains resemble B. singularis in spite of the difference in ubiquinone systems. These yeasts may be yeast phases of certain species of the genus Itersonilia or may represent a genus yet to be established..
