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Effects of salt stress on N metabolism in rapeseed seedlings under different N levels. (A) Glutamine synthetase (GS) and (B) glutamate synthase (GOGAT). S0 and S1 respectively represent salinity levels of 0 and 3 g NaCl kg−1 soil. N0, N1, N2, and N3 respectively represent N rate levels of 0, 0.1, 0.2, and 0.3 g N kg−1 soil. Different letters indicate significant differences at p = 0.05. Probability level is indicated by ** for 0.01. FW, fresh weight.
