Abstract
Photosystem II chlorophyll a fluorescence in fully developed green leaves is dependent to the oxidoreduction state of its electron transport carriers and related processes (1, 2). It is widely accepted, that the variable fluorescence induction kinetics is a representative indicator of the photosynthetic electron transport in intact leaf. After the rapid rise of the fluorescence yield induced by continuous illumination, the fluorescence level is lowered by the competition between the photochemical reaction and the processes not directly related to the redox state of QA, known as non-photochemical quenching phenomena (QN) (3). Beside the fact that QN can be related to the photoinhibition of photosynthesis (QI) (4), it was found that the major part of QN in green plants is dependent to the interthylakoids ΔpH, so called energy-dependent quenching value (QE) (5). However, another part of QN (named as QT) is also attributed to the phosphorylation and uncoupling of some peripheral PSII light harvesting complexes (LHCIIb) (4).
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