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. 2019 Apr 30;10:538. doi: 10.3389/fpls.2019.00538

FIGURE 4.

FIGURE 4

Effect of nodulation on the activities of POD (A,B), SOD (C,D), and CAT (E,F) in alfalfa shoots and roots under 0°C. The data are means ± SE, n = 3. Different letters indicate a significant difference between means (P < 0.05).