title: Green and brown colour effects in tremellaceous yeast fungi on Staib agar.
abstract: Fifty-eight species of basidiomycetous yeast fungi were examined for green and brown colour effects (GCE, BCE) on Staib agar (Guizotia abyssinica creatinine agar). In addition to 9% of Cryptococcus laurentii strains tested, only Cryptococcus podzolicus was GCE-positive. Out of 14 strains of this species, 13 showed a GCE and four showed a BCE. All GCE-positive strains utilized creatinine and creatine as a source of nitrogen but not of carbon. None of these strains could grow at 37 degrees C. Unlike Cr. laurentii, no strains of Cr. podzolicus assimilated glycine as a source of carbon. No association was found to exist between GCE and killer activity. Some tremellaceous creatinine-negative species (Cryptococcus gastricus) showed a BCE whereas some sporidiobolaceous creatinine-positive yeasts (Leucosporidium, Rhodotorula) produced neither GCE nor BCE.
authors.affiliation: Institute for Biochemistry and Physiology of Microorganisms, Pushchino, Russia.
authors.forename: W I
authors.initials: WI
authors.lastname: Golubev
authors.forename: F
authors.initials: F
authors.lastname: Staib
mesh_terms: D001487:Basidiomycota / Q000254:growth & development* / Q000378:metabolism*; D003116:Color; D003470:Culture Media
chemical_list: D003470:Culture Media