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Diurnal variation in sulphate uptake and fluxes through primary and secondary sulphate assimilation in Arabidopsis (Col-0) grown on MS-agarose plates for 2 weeks in long days (16h light/8h dark). Sulphate uptake (A) and incorporation of 35S into thiols (B), proteins (C), and GLS (D) was determined. The light regime is indicated by white or black bars. Data are presented as means ±SD. Different letters mark significantly different values from four biological replicates (P < 0.05).
