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Effect of glycine betaine (GB, 0, and 50 mM) on the activity of N-metabolism enzymes (nitrate reductase (NR, (A)), nitrite reductase (NiR, (B)), glutamine synthetase (GS, (C)), glutamate synthase (GOGAT, (D))) in stevia leaves under NaCl (0, 25, and 50 mM) treatment. Values (means ± SD, n = 6) followed by the same letter are not significantly different (p < 0.05; Duncan test).
