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The Genera Phyllobacterium and Ochrobactrum

The study of leaf nodulation in several tropical plant families dates back to the beginning of the 20th century. Various genera of bacteria, e.g., Phyllobacterium, were thought to be associated with leaf nodules (see below). Phyllobacterium was described by Knösel (1962) but the genus only found wide taxonomic recognition with the publication of Bergey's Manual of Systematic Bacteriology (Knösel, 1984). DNA-rRNA hybridizations revealed a close relationship between Phyllobacterium and bacteria from the Centers for Disease Control (CDC) group Vd within the "alpha" subclass (rRNA superfamily IV) of the proteobacteria together with those throughout of the genera Brucella, Rhizobium, Mycoplana, and Agrobacterium (De Ley et al., 1987; Stackebrandt et al., 1988). Holmes et al. 1988 proposed the name Ochrobactrum anthropi for CDC group Vd. They also demonstrated that Phyllobacterium showed closest phenotypic similarity to Ochrobactrum anthropi. In the