Root and shoot concentrations of GSH and its composing amino acids in interspecies grafts of F. robusta and F. bidentis. Seedlings of F. robusta (C3) and F. bidentis (C4) were grafted 5 d after germination and analyzed 35 d after grafting. A, Steady-state levels of GSH. B, Steady-state concentrations of the GSH-composing amino acids Glu, Cys, and Gly. Data are shown as box plot (25–75%); the line represents median, and the whiskers represent 1.5 IQR, n = 4. Different letters represent values significantly different at P < 0.05 (Student’s t test).