Sulphur oxidation by two species of streptomyces

الملخص EN

The oxidation of sulphur element by Streptomyces [radiae and S.

griseuswas studied in vitro.

Both species oxidized it to sulphate, but while S.

griseus produced tetrathionate and thiosulphate , S.

[radiae produced only tetrathionate.

The oxidation of sulphur by both species increased by increasing pH of the medium, and did not occur at pH 2.6.

Both species could utilize different types of sugars and amino acids to support sulphur oxidation, and also oxidized it over a range of sucrose concentration from 0LOO f.Lg mrI.

Both species were also able to oxidize thiosulphate in media lacking any added carbon sources, with both biomass and oxidation products increasing by increasing the concentrations of added thiosulphate.

S.

fradiae oxidized sulphur element when using straw as the sole carbon source and was able to oxidize it when growing in soil sterilized by autoclaving.

The results suggest that the used species, like other heterotrophic bacteria and fungi.

playa role in sulphur oxidation in soil.