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Effect of nitrogen form (NH4+ or NO3−) on the activity of PME in the cell wall of A, ‘Nip’ and B, ‘Kas’ roots. Seedlings were transferred to NH4+ or NO3− nutrient solution in the presence or absence of P for 1 week. Data are means ± sd (n = 4). Columns with different letters are significantly different at P < 0.05.
