Table 1.

Comparison of the response speed for CO₂ assimilation rate, stomatal and mesophyll conductance, and the maximum rate of RuBP carboxylation in Arabidopsis and tobacco

Parameters	Arabidopsis		Tobacco
	t 50 (min)	t 90 (min)	t 50 (min)	t 90 (min)
A	9.5 ± 0.8 b	19.7 ± 1.5 b	10.0 ± 1.4 a	19.0 ± 2.1 a
g s	18.8 ± 1.0 c	29.7 ± 1.4 c	18.5 ± 0.9 b	28.9 ± 0.8 b
g m	8.7 ± 1.2 b	14.8 ± 1.8 ab	9.2 ± 2.2 a	17.1 ± 3.3 a
V cmax	4.3 ± 0.5 a	9.7 ± 1.2 a	5.3 ± 1.0 a	11.0 ± 3.0 a
J	8.9 ± 0.8 b	19.2 ± 1.5 b	9.5 ± 1.4 a	18.6 ± 2.1 a

t ₅₀ and t₉₀ are the times when CO₂ assimilation rate (A), stomatal (g_s) and mesophyll (g_m) conductance to CO₂, the maximum rate of RuBP carboxylation (V_cmax), and the electron transport rate (J) reached 50% and 90% of their maximum value, respectively, after the step change in light. Different letters indicate significant variation in t₅₀ or t₉₀ between the five parameters (P < 0.05) according to the Tukey–Kramer test.