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DNA Base Composition of Some Phytopathogenic Pseudomonads. J. F. Jackson, Senior Lecturer in Biochemistry, Department of Agricultural Biochemistry and Soil Science, Waite Agricultural Research Institute, The University of Adelaide, South Australia; D. C. Sands, Former National Science Foundation Postdoctoral Fellow at C.S.I.R.O., Division of Soils, Adelaide, South Australia 5064, Present address of junior author: The Connecticut Agricultural Experiment Station, New Haven 06504. Phytopathology 60:1863-1864. DOI: 10.1094/Phyto-60-1863.

A large group of fluorescent phytopathogenic pseudomonads, previously distinguished from fluorescent saprophytes by a more limited nutritional versatility and a negative test for arginine dihydrolase, also exhibit a lower range of values for their DNA base compositions. These pathogens ranged from 57 to 60% G + C, whereas other fluorescent pseudomonads are reported to range from 59-68% G + C. Satellite bands were not observed with buoyant density centrifugation.

Additional keywords: Pseudomonas mori, DNA base ratio, taxonomy, buoyant density.