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1 Department of Plant Pathology, University of California, Berkeley, California 94720
2 Department of Microbiology, New York University Medical School, New York, New York 10016
3 Department of Anaerobic Microbiology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
* Corresponding author. Mailing address: Division of Entomology and Plant & Soil Microbiology, University of California, Berkeley, CA 94720. Phone: (510) 643-8063. Fax: (510) 642-3845.
ABSTRACT
Two pseudomonad strains that produce a yellow cellular pigment, in addition to a diffusible fluorescent pigment on Kings medium B, were isolated from cankers on walnut trees. Biochemical properties, such as a positive oxidase reaction, a negative arginine dihydrolase reaction, and the production of a fluorescent pigment, in addition to the results of an extensive nutritional characterization study and DNA-DNA hybridization experiments, indicated that these strains belong to a new Pseudomonas rRNA group I species. This conclusion was supported by the results of a determination of the sequence of the PCR-amplified 16S rRNA gene and a comparison with the 16S rRNA genes of other bacterial species. The genomic DNAs of the strains had a base composition of 63 mol% G+C. The name Pseudomonas flavescens sp. nov. is proposed. Strain B62 (= NCPPB 3063) is the type strain of the species.
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