EFFECT OF 3-FORMYLCHROMONES SUBSTITUTED WITH 4-AMINOSALICYLIC ACID AND SOME OTHER ANILINE DERIVATIVES ON PHOTOSYNTHESIS INHIBITION IN SPINACH-CHLOROPLASTS

The inhibitory effect was investigated of 16 different 3-formylchromon e derivatives, the condensation products of 6-R(1)-3-formylchromone wi th 4-aminosalicylic acid and of the adducts of 6-R(1)-3-formylchromone with n-alcohols and aminosalicylic acids or some other derivatives of aniline, on the photochemical activity of spinach chloroplasts. The i nhibitory activity of the compounds studied correlated with the lipoph ilicity of the R(1) and R(2) (alkoxy) substituents. Using fluorescence study it was found that the site of action of the studied effecters i s photosystem (PS) 2. By EPR spectroscopy it was confirmed that the st udied effecters interact with the intermediates Z(+)/Y+ which are situ ated in D 1 and D 2 proteins on the donor side of PS 2 which is reflec ted in a partial decrease in the photosynthetic electron flow through PS 2 to PS 1. It was found that the core of PS 2 is not damaged.