Figure 2.

The diurnal relationship between ETR and irradiance in leaf 13 of rice cv Nipponbare at 122 DAS as a function of natural intercepted irradiance (as shown in Fig. 1) in black symbols. Conventional light response curves were made on the same leaves, with the same measuring heads on the same day, at 9 a.m., noon, and 3 p.m., but with light intensity incrementing from 0 saturating intensity from the actinic light source inside the measuring head. Natural irradiance was blocked out for conventional light response curve duration, with 3.5 min acclimation time at a given light intensity (total curve time ∼42 min).