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Published on: March 24, 2012
Sulphite-induced changes of sulphur metabolism in the lichen alga Trebouxia sp
1University of Halle, Institute of Biochemistry, Division of Plant Biochemistry, D(O)-4050 Halle (Saale), Weinbergweg 16a, Germany.
Abstract:
Solutions of sodium sulphite have been used to simulate the effect of gaseous sulphur dioxide on the lichen alga Trebouxia sp. The uptake and the metabolism of inorganic and organic [35 S]compounds such as sulphate, sulphite, and cysteine were investigated in cells of Trebouxia under conditions of sulphite preincubation (sulphite-stressed cells: 3 d pretreatment with 50 mmol m-3 and 5 mol m-3 solutions of sodium sulphite). Metabolism was similar, regardless of whether the Trebouxia was provided with [35 S]sulphate or -sulphite. In sulphite-stressed cells, uptake and incorporation into ethanol-soluble compounds, especially cysteine and methionine, was significantly decreased. In Trebouxia exogenous [35 S]cysteine is metabolized only at a very low rate.
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