Figure 6.
Images of PSII efficiency (Fq′/Fm′) in part of a leaf of C. communis (approximately 8×8 mm) with a 4-mm-diameter grease patch applied to both sides at different external CO2 concentrations (Ca). PPFD was 400 μmol m−2 s−1. Ca and intercellular CO2 concentration, Ci, values determined for the unpatched portion of the leaf were as follows: A, Ca = 145, Ci = 50; B, Ca = 383, Ci = 154; C, Ca = 643, Ci = 342; and D, Ca = 1,790, Ci = 1,375 μmol mol−1. The colored bar indicates how the range of Fq′/Fm′ values is mapped to the color palette.