Phosphorylation of some polypeptides of photosystem 2 (PS2) core was o
bserved for chloroplasts phosphorylated under anaerobic conditions. Th
ese polypeptides appeared in the photosystem 1. (PS1) particles isolat
ed from phosphorylated chloroplasts. Phosphorylated PS2 was transferre
d onto PS1 as an integral complex, which retained photochemical activi
ty and originated variable fluorescence.