Figure 7.

Incorporation of ³⁵S from [³⁵S]sulfate into thiols and proteins. Arabidopsis plants (4.5 weeks old) were fed with ³⁵SO₄²⁻ in the nutrient solution for 4 h together with different nitrogen compounds as in Figure 3. Radioactive sulfur in SO₄²⁻, Cys, GSH, and protein in leaves and roots was measured. Mean values ± sd from four measurements are presented. Values indicated by different letters are different at P ≤ 0.05.