Nucleic Acid Hybridization Studies on Microbacterium, Curtobacterium, Agromyces and Related Taxa

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Abstract
Thirty strains of Agromyces, Arthrobacter, Curtobacterium, Brevibacterium, Corynebacterium and Microbacterium, exhibiting the rare peptidoglycan of group B, were subjected to extensive nucleic acid hybridization studies. The DNA homology values indicate that C. insidiosum DSM 20157 is genetically identical with C. muchiganense DSM 20134. Curtobacterium sepedonicum NCPPB 378 and C. nebraskense DSM 20400 are closely related to Corynebacterium michiganense DSM 20134. C. betae DSM 210141, C. oortii ATCC 25283 and C. poinsettiae ATCC 9682 are genetically identical with C. flaccumfaciens DSM 20129. Curtobacterium citreum ATCC 15828, C. luteum ATCC 15830 and C. pusillum ATCC 19096 share a high degree of relatedness to Corynebacterium flaccumfaciens DSM 20129. All other described species are more distantly related to each other. DNA-RNA cistron similarity studies reveal that all corneforms with a peptidoglycan group B are members of 1 homogeneous cluster for which the rank of a genus is suggested.