The Relationship Between the Relative Quantum Efficiencies of Photosystems in Leaves. Efficiency of PS2 in Relation to Non-Photochemical Fluorescence Quenching
Recently the development of techniques capable of measuring in vivo simultaneously the photochemical (qQ) and non-photochemical (qNP) components of chlorophyll fluorescence quenching, absorbance changes at 820 nm and photosynthetic gas exchange of leaves have allowed quantitative estimation of the quantum efficiencies of photosystems 2 (ϕPS2) and 1 (ϕPSl)and non-cyclic electron transport in leaves (1–6). These studies have provided evidence that non-photochemical processes associated with qNP could explain the observed reduction of quantum yield of open PS2 reaction centres as light intensity is increased (1–3,5,6).
KeywordsFluorescence Yield Photochemical Efficiency Single Turnover Flash Chlorophyll Fluorescence Quenching Relative Quantum Efficiency
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