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. 2005 Sep;139(1):254–266. doi: 10.1104/pp.105.062950

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Copyright © 2005, American Society of Plant Biologists

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Figure 8. — Images of PSII efficiency (F_q′/F_m′) with 4-mm-diameter artificial grease patches applied to different leaf surfaces in P. vulgaris (A and B) and C. communis (C and D). Images approximately 8×8 mm. PSII efficiency measured from upper surface with patch on upper surface only (A and C) or lower surface only (B and D). C_a and C_i values for the unpatched leaf from gas exchange measurements were as follows: A, C_a = 268, C_i = 158; B, C_a = 243, C_i = 122; C, C_a = 315, C_i = 171; and D, C_a = 315, C_i = 171 μmol mol⁻¹. The colored bar indicates how the range of F_q′/F_m′ values is mapped to the color palette.