Chemotaxonomic and phenotypic characteristics were investigated in seven succinoglycan-decomposing bacteria isolated from soil and the rhizospheres of cucumber-roots and in two segregants originated from them.All the strains were gram negative and rod-shaped, and produced water-insoluble yellow orange pigment.The two segregants differed from the original strains in formation of spreading colonies.The fatty acids of the nine strains were mainly i-Cis: o, 411 C16:1, 2-OH i-C15: o, 3-OH i-C,,: o, and 3-OH i-C17: o.Their deoxyribonucleic acid base compositions ranged from 42.8 to 46.0%, and a menaquinone system (MK-7) was found.The nine strains were assigned to the genus Cytophaga, but they differed from the known Cytophaga species.A new species, Cytophaga arvensicola sp.nov., is proposed.The type strain is M64 (=IAM 12650).Succinoglycan is the water-soluble acidic polysaccharide produced by Alcaligenes faecalis var.myxogenes (1, 2).Succinoglycan and succinoglycan-like polysaccharides have been found to be produced by a large number of strains in the Rhizobium and Agrobacterium species (2-5).The structure of succinoglycan was studied using succinoglycan depolymerase which was produced by Flavobacterium sp.strain M64 (6).After the first isolation, three additional succinoglycan-decomposing strains were isolated from the different soil samples.Meanwhile, three strains resembling succinoglycan-decomposing bacteria were isolated in the course of the study of the microbial flora of the rhizospheres of cucumber-roots.This paper deals with the phenotypic and chemotaxonomic characterization
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Oyaizu et al. (1982) studied this question.