Abstract
The ability of purple photosynthetic bacteria to form phase variants (dissociants) was discovered. The R and M phase variants were isolated from the Rhodobacter sphaeroides population, and their affiliation with the parent strain was confirmed by the PCR of their 16S rRNA gene fragments. The R and M variants were different both in colony morphology and in resistance to some physical and chemical factors. The R variant of Rhb. sphaeroides had advantages when grown in the light, at elevated temperature, under aeration, and UV irradiation, whereas the M variant had advantages when grown aerobically in the dark or at increased NaCl concentrations.
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