Abstract
Two cultivars (Mec and Chiarano) of wheat (Triticum aestivum) were exposed to constant low levels of SO 2 (35, 75 and 120 nl l -1 ) over a period of 4 months. In previous studies Mec has been shown to be more sensitive to SO 2 and this has been confirmed in the present study where Mec showed a greater tendency than Chiarano to accumulate soluble non-protein SH compounds, principally glutathione and cysteine. The reduced glutathione to oxidized glutathione ratio (GSH/GSSG) increased significantly in Mec with SO 2 treatment, but no change in the activity of glutathione reductase was observed
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