Table I.

Wall-bound PAO activity expressed as the percentage of total PAO activity (wall-bound plus extractable) in the outer tissues of the mature zone of the maize mesocotyl

Time/Light Treatment	Wall-Bound PAO Activity (% of Total PAO Activity Values)
	Control	NAA-treated plants
T0 (96 h after soaking)	6%  (± 0.39)	–
T1 (12 h after T0 in the dark)	23% (±1.9)	18%  (± 1.35)
T2-D (36 h after T0 in the dark)	32% (±2.75)	31% (±2.13)
T2-L (12 h after T0 in the dark + 10-min light irradiation + 23 h 50 min in the dark)	30% (±2.42)	33% (±2.91)

Etiolated plants were sprayed with 10 μM NAA every 12 h starting from T0 (96 h after soaking). Light irradiation was performed 12 h after T0 (T1) for 10 min (18,000 lux) in a growth chamber. T1, Twelve hours after T0 in the dark; T2-D, 36 h after T0 in the dark; T2-L, 12 h after T0 in the dark + 10-min light irradiation + 23 h 50 min in the dark. Mean values ± sd.