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Sulphite‐induced changes of sulphur metabolism in the lichen alga Trebouxia sp
Author(s) -
SCHLEE D.
Publication year - 1992
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1992.tb04235.x
Subject(s) - sulfur , metabolism , sulfur metabolism , chemistry , cysteine , methionine , lichen , sodium , biochemistry , environmental chemistry , biology , organic chemistry , botany , enzyme , amino acid
SUMMARY 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.