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. 2008 Nov 10;103(2):313–323. doi: 10.1093/aob/mcn208

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© The Author 2008. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

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Fig. 5. — Effect of reducing C_a by 100 µmol mol⁻¹ on (A) quantum efficiency of PSII photochemistry (F_q′/F_m′), (B) the operating efficiency of PSII photochemistry (F_v′/F_m′), (C) photochemical fluorescence quenching (F_q′/F_v′), (D) non-photochemical fluorescence quenching (NPQ) and (E) maximum quantum efficiency of PSII photochemistry (F_v/F_m) of well-drained tomato plants. Plants were dark-adapted for at least 20 min prior to measurement of F₀ and F_m to estimate NPQ and F_v/F_m. Each point represents the mean of 24 replicate measurements made on the fifth oldest leaves of eight 1-month-old plants per treatment. Vertical lines are LSDs at P = 0·05. Black boxes on the x-axis indicate dark periods.