Fig. 6

Effects of N supply on mean (± SE, n = 4) activities of acid-metabolizing enzymes in leaves and roots. a and k Leaf and root NADP-malic enzyme (NADP-ME). b and l Leaf and root NAD-ME. c and m Leaf and root NADP-malate dehydrogenase (NADP-MDH). d and n Leaf and root NAD-MDH. e and o Leaf and root phosphoenolpyruvate carboxylase (PEPC). f and p Leaf and root phosphoenolpyruvate phosphatase (PEPP). g and q Leaf and root pyruvate kinase (PK). h and r Leaf and root citrate synthase (CS). i and s Leaf and root aconitase (ACO). j and t Leaf and root NADP-isocitrate dehydrogenase (NADP-IDH)