№1, 2023
Effect of Mn2+ on formation of photosynthetic apparatus at low pH
Summary
Induction curves of ms delayed fluorescence of Chl а (ms DF Chl а) and chlorophyll-protein complexes (PAGE-polyacrylamide gel electrophoresis) in leaves of wheat seedlings (Triticum aestivum L.) during biogenesis under the influence of MnCl2 were studied. Changes in the maxima of the fast and slow components of msec-delayed fluorescence, as well as their ratio, give reason to believe that the toxic effect of Mn2+ ions, on the one hand, leads to damage to chlorophyll biosynthesis, and on the other, to a slowdown in the formation of photochemical reactions causing delayed fluorescence. This probably occurs as a result of disruption of the interaction between the reaction center (RC) of photosystem II (PSII), the proton gradient and the stability of electron transfer in the electron transport chain (ETC). A decrease in the intensity of the light-harvesting peaks of chlorophyllprotein complexes on the electropherogram indicates that the formation of chlorophyll is blocked or the pigment-pigment or pigmentprotein bonds are destroyed.