Intracellular sulfur content changes in the purple sulfur bacteria Thiocapsa sp. under different light intensity
S. Lavryk, S. Hnatush
Ivan Franko National University of Lviv
Hrushevsky St. 4, Lviv 79005, Ukraine
sofi_lavryk@email.ua
The purple sulfur bacteria Thiocapsa sp. carries out anoxygenic photosynthesis and uses reduced sulfur compounds as electron source. This microorganism oxidizes hydrogen sulfide to sulfur and deposits it internally as sulfur globules. The stored sulfur also may serve as electron donor and be oxidize to sulfate. The light intensity influences on lot of metabolitical processes in photosynthetic microorganisms. In this study sulfur storage in cells Thiocapsa sp. under different light intensity was investigated. Data of investigation showed that Thiocapsa sp. accumulated considerable amounts of intracellular sulfur under light intensity 100–200 lux. Lower sulfur content in cells Thiocapsa sp. was detected under higher light intensity, but the reserved sulfur used in photosynthetical process more intensively.
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Keywords: purple sulfur bacteria, Thiocapsa sp., intracellular sulfur, light intensity
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