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In the present study, spheroplasts from the aerobic anoxygenic photosynthetic marine bacterium Erythrobacter litoralis were generated and cultivated. In the presence of penicillin, the spheroplasts grew and enlarged in marine broth without undergoing cell division. However, continuous light inhibited their enlargement, and they were therefore cultivated in the dark. Cellular DNA was quantified at various time points (0, 24, and 48 h) and temperatures (20°C, 25°C, and 30°C) using real-time quantitative PCR. The DNA content was highest at 30°C in the absence of penicillin, whereas there was no observable change with exposure to penicillin at all evaluated temperatures. During growth, larger spheroplasts were more frequently observed at 25°C in the presence of penicillin. These results demonstrate that the optimal culture conditions for the enlargement of spheroplasts in E. litoralis differ from those required for cell division.

journal of general and applied microbiology

Requirement of dark culture condition for enlargement of spheroplasts of the aerobic anoxygenic photosynthetic marine bacterium &lt;i&gt;Erythrobacter litoralis&lt;/i&gt;