Figure 7.

A, Diurnal changes in photosynthesis for leaves of IR72 grown under LL, ML, and HL (10%, 40%, and 100% of full sunlight, respectively). Photosynthesis was measured as in “Materials and Methods” except that natural sunlight was used as the light source. This was achieved by replacing the LED source in the leaf chamber with a clear-topped unit (“sun and sky,” LI-COR, Lincoln, NE). Attention was paid to the natural upright leaf posture of rice leaves such that at midday the incident light was lowered (Murchie et al., 1999a). B, Incident sunlight for this diurnal course, measured using the external light sensor on the LI-COR 6400. Values are means ± se, n = 5. Each value is the mean of measurements taken over a consecutive 3-d period.