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. 2019 Jan 22;179(4):1479–1485. doi: 10.1104/pp.18.01493

Figure 3.

Figure 3.

Effects of PSI photoinhibition on photosynthetic parameters of PSII in Arabidopsis. A, Relationship between effective quantum yield of PSII [Y(II)] and residual total oxidizable P700 (Pm). B, Relationship between nonphotochemical quenching (NPQ) and Pm. C, Relationship between inferred oxidation level of PQ pool (qL) and Pm. Evaluations were made before and after rSP illumination (300 ms, 20,000 µmol photons m−2 s−1, every 10 s). Photosynthetic parameters of PSII were measured at the steady state of photosynthesis (820 µmol photons m−2 s−1) under 21 kPa O2 and 100 Pa CO2. Data are independent measurements, with quadruple replicates indicated by circles, triangles, squares, and diamonds. Red lines show linear regressions (A, R2 = 0.896; B, R2 = 0.897; C, R2 = 0.860, respectively).