Fig. 2

Mean comparison of metabolic activity of arbuscular mycorrhizal fungi C. equisetifolia (a, c) and C. glauca (b, d) roots inoculated with Rhizophagus fasciculatus (Rf) or Rhizophagus intraradices (Ri) in the presence of 0, 150, or 300 mM of NaCl. Fungal metabolic activity was determined using the succinate dehydrogenase test (SDH) to reveal active AMF structures and the diaminobenzidine test (DAB) to reveal senescent AMF structures. Values are the mean of five plants. Standard deviations are displayed as bars, and bars sharing the same letter are not significantly different at p < 0.05 according to Fisher’s LSD test (“a” = lowest values and “b” = highest values). Data presented are representative of two independent experiments. Lowercase letters (a-b) indicate significant differences regarding AMF inoculation. Uppercase letters (A-C) indicate significant differences regarding NaCl concentrations. Uppercase letters in parentheses (A)-(B) indicate significant differences regarding species