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Abstract
The genome sizes of 33 strains of budding bacteria were determined by deoxyribonucleic acid renaturation kinetics. The M r values ranged from 1.67 × 109 to 4.43 × 109 for strains representing the following genera: Hyphomicrobium (seven strains; M r, 2.08 × 109 to 2.73 × 109), Hyphomonas (six strains; M r, 1.67 × 109 to 2.13 × 109), Pedomicrobium (five strains; M r, 2.81 × 109 to 3.43 × 109), genus T (two strains; M r, 2.32 × 109 to 2.46 × 109), genus D (one strain; M r, 1.73 × 109), genus F (one strain; M r, 2.03 × 109), Pirella (seven strains; M r, 2.73 × 109 to 4.43 × 109), and Planctomyces (four strains; M r, 2.67 × 109 to 3.65 × 109). The taxa designated genus T, genus D, and genus F represented new budding bacteria which will be formally described elsewhere. The genome size ranges of Hyphomicrobium spp., Hyphomonas spp., and Pedomicrobium spp. were relatively small compared with those of Planctomyces spp. and Pirella spp. The plotting of genome sizes against deoxyribonucleic acid base compositions demonstrated distinct cluster areas, some of which allowed clear separation of the genera studied.
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