Fig. 4
Activities of γ-ECS, PCSase, GS and AR in shoots and roots of perennial ryegrass under different treatments. CK: 0 mg kg−1 Cd and As (control), C: 3 mg kg−1 Cd, A: 120 mg kg−1 As, CA: 3 mg kg−1 Cd + 120 mg kg−1 As. Different letters correspond to significant differences among different treatments (P < 0.05)