Fig. 5From: Leaves play a central role in the adaptation of nitrogen and sulfur metabolism to ammonium nutrition in oilseed rape (Brassica napus)N source effect on ATPS (a) and OASTL (b) enzyme activities in roots and leaves of B. napus. Plants were hydroponically cultured with 1 mM nitrate or ammonium. Values represent mean ± SE (n = 4). Asterisk (*) indicates significant differences between nitrate and ammonium (P < 0.05)Back to article page