Fig. 5

Enzyme activity under steady and dynamic conditions. The activity of Rubisco (a, f), FBPase (b, g) and SBPase (d, i) as well as the ratios of activity between FBPase and Rubisco (c, h) and between SBPase and Rubisco (e, j) in the leaves of high nitrogen (HN; filled)- and low nitrogen (LN; closed)-supplied plants under dynamic light. The bar above the plot (a) shows the high (1600 μmol m^− 2 s^− 1; HL; white bar) and LL (100 μmol m^− 2 s^− 1; HL; grey bar) periods. The leaves under changing light (a-e) were adapted under HL for 20–40 min, and the leaves were then exposed to LL for 600 s, after which the light was changed to HL for 180 s. The leaves under fluctuating light (f-j) were adapted under HL for 20–40 min, after which the leaves were exposed to fluctuating light such that the light intensity alternated between high (1600 μmol m^− 2 s^− 1) and low (100 μmol m^− 2 s^− 1) every 120 s for 32 min. Means ± SD, n = 6. Different letters indicate significant differences at P < 0.05 between different treatments (T-test)