Abstract
The emission of light quanta by preilluminated photosynthetic objects occurs over two mechanisms - photophysical, by direct radiation of excited chlorophyll molecules (prompt fluorescence - PF), and photochemical, by means of secondary, chemical excitation of chlorophylls (delayed fluorescence - DF) (1). During the both luminescence species the light quanta origin from almost the same population of antennae pigment molecules (2), predominantly in Photosystem II (PS II). The changes of PF and DF quantum efficiency during dark-light state transition of photosynthetic apparatus, denoted as induction kinetics (IK), correlate with: a) electron transport rate in both donor and acceptor sides of PS II; b) thylakoid membrane (TM) energization; c) secondary ion transfer; d) excitation energy distribution between both Photosystems; e) enzymatic dark processes of Photosynthesis (1, 3–6), etc. Comparison of kinetic characteristics of simultaneously radiated prompt and delayed luminescence can contribute to better understanding of both luminescent processes. In this study the effects of PS II electron acceptors and herbicide atrazine on kinetic characteristics of simultaneously registered PF and DF in pea thylakoids were analyzed. The contribution of sub-millisecond and millisecond decay kinetics components of DF in the different induction kinetics phases was estimated.
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