Figure 2.

Spatiotemporal heterogeneity of photosynthetic efficiency in a leaf of K. daigremontiana during the light period of the normal day/night CAM cycle. Maps of φ_PSII, captured at the times denoted by capital letters in Fig. 1a. φ_PSII was imaged by noninvasive chlorophyll fluorescence measurements at 20-min intervals following the saturating flash method similar to that described by refs. 22 and 23. Values were normalized to the maximum obtained during the experiment (see color code, Lower Right).