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SULFIDE OXIDATION UNDER OXYGEN LIMITATION BY A THIOBACILLUS-THIOPARUS ISOLATED FROM A MARINE MICROBIAL MAT

VANDENENDE, FP. & VANGEMERDEN, H., Oct-1993, In : FEMS Microbial Ecology. 13, 1, p. 69-77 9 p.

Research output: Contribution to journalArticleAcademicpeer-review

  • FP VANDENENDE
  • H VANGEMERDEN

The colorless sulfur bacterium Thiobacillus thioparus T5, isolated from a marine microbial mat, was grown in continuous culture under conditions ranging from sulfide limitation to oxygen limitation. Under sulfide-limiting conditions, sulfide was virtually completely oxidized to sulfate. Under oxygen-limiting conditions, sulfide was partially oxidized to zerovalent sulfur (75%) and thiosulfate (17%). In addition, low concentrations of tetrathionate and polysulfide were detected. The finding of in vivo thiosulfate formation supports the discredited observations of thiosulfate formation in cell free extracts in the early sixties. In a microbial mat most sulfide oxidation was shown to take place under oxygen-limiting conditions. It is suggested that zerovalent sulfur formation by thiobacilli is a major process resulting in polysulfide accumulation. Implications for the competition between colorless sulfur bacteria and purple sulfur bacteria are discussed.

Original languageEnglish
Pages (from-to)69-77
Number of pages9
JournalFEMS Microbial Ecology
Volume13
Issue number1
Publication statusPublished - Oct-1993

    Keywords

  • THIOBACILLUS, OXYGEN LIMITATION, SULFIDE OXIDATION, MICROBIAL MAT, MARINE SEDIMENT, CONTINUOUS CULTURE, SULFATE REDUCTION, INORGANIC SULFUR, PYRITE FORMATION, THIOSULFATE, CONSUMPTION, SEDIMENTS, GROWTH, CYCLE

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