Fig 4. The SOD activity (a), POD activity (b), CAT activity (c), APX activity (d), GPX activity (e), and GR activity (f) in R. pseudoacacia leaves were affected by Pb stress levels and AMF inoculation.

NM, non-inoculated control; Fm, inoculated with F. mosseae; and Ri, inoculated with R. intraradices. The results are shown as the mean (n = 6) ± SD. The same letter indicates no significant difference among treatments (Duncan’s test, P < 0.05). Two-way ANOVAs were used to determine the significance of the effects of the Pb level (Pb), AMF inoculation (AMF), and their interactions (Pb × AMF) on those parameters, as shown in S4 Table.