Abstract

Sulfide oxidation and product formation was studied in the cyanobacterium Microcoleus chtonoplastes. Anoxygenic photosynthesis was induced in the presence of sulfide and light. It was demonstrated that thiosulfate was the only product of the 3(3,4-dichlorophenyl)1,1-dimethylurea (DCMU)-insensitive photo-oxidation of sulfide. The affinity of this system for sulfide was shown to be very low.

Oxygenic photosynthesis continued in the presence of sulfide. After an induction period of 3 h, oxygenic and anoxygenic photosynthesis were shown to be operating simultaneously.

The ecological importance of sulfide oxidation and thiosulfate production by M. chtonoplastes is discussed in the context of laminated microbial ecosystems, where cyanobacteria and purple sulfur bacteria coexist.

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