SPECTRAL CHARACTERISTICS AND ORIENTATION OF NATIVE FORMS OF PIGMENTS IN CHLOROPLASTS OF BARLEY SEEDLINGS UNDER INTERMITTENT AND CONTINUOUS IRRADIATION

Chlorophyll (Chl) form at 710-712 nm localized on the small protein si multaneously connected with the reaction centre of photosystem 1 (RC P S1) and the light-harvesting complex I (LHC-I) polypeptides is suppose d to be the source of long-wavelength band of low-temperature fluoresc ence of chloroplasts at 735-740 nm. Chloroplasts of intermittently irr adiated seedlings (or chloroplasts of the Chl b-less barley mutant) di d not differ from chloroplasts of continuously irradiated seedlings (o r chloroplasts of wild type barley) in the set of Chl a and beta-carot ene forms and their orientation in the membrane. A competition for the newly synthesized Chl a molecules occurred between the RC PS 2 and LH C-II polypeptides.