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Effects of Fe deficiency and AMF on antioxidant enzymes activities in alfalfa root and shoot. (a) Changes of catalase (CAT), (b) ascorbate peroxidase (APX), (c) superoxide dismutase (SOD), and (d) glutathione reductase (GR) under Fe deficiency with or without AMF. Data represent means ± SD (n = 3). Different letters above the error bar indicate significant difference at p < 0.05 level.
