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Impacts of Cu–pH interactions on the activities of ATPS (A,I), APR (B,J), SiR (C,K), CS (D,L), γGCS (E,M), γGT (F,N), GS (G,O), and GST (H,P) in leaves and roots. Bars represent means ± SE (n = 4). Different letters above the bars indicate a significant difference at p < 0.05. Gly-Gly, glycylglycine; OAS, O-acetylserine.
