Nonlinear dynamics of degradation of Vallisneria spiralis L. chlorophyll photoluminescence at high excitation levels

Olegh Vakulenko, Olesja Grygorieva


In the context of the study of the photoinhibition mechanisms of the higher water plant Vallisneria spiralis L. photosynthetic machinery, the fluorescence intensity degradation of chlorophyll a (687 nm) leaf fragments at photoexcitation levels from 7 to 150 mW/cm2 on the wavelength of 488 nm, is investigated. It is shown that the luminescence efficiency decrease rate cannot be described by simple exponential or hyperbolic dependence. To explain this behavior, a kinetic model accounting for dimerization of luminescent molecules under the influence of excess lighting, is put forward. It is supposed that dimers are not capable to produce luminescence in the determined spectral area and, therefore, to transmit energy to their molecules of a photosystem and, eventually, to the reaction center. This results in a plant’s photosynthetic activity decrease.


Water plants, Photoinhibition mechanism, Fluorescence intensity, Luminescence efficiency

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