EFFECTS OF 2-ALKYLTHIO-6-AMINOBENZOTHIAZOLES AND THEIR 6-N-SUBSTITUTED DERIVATIVES ON PHOTOSYNTHESIS INHIBITION IN CHLORELLA-VULGARIS AND SPINACH-CHLOROPLASTS

2-Alkylthio-6-aminobenzothiazoles and their 6-N-substituted derivative s enzothiazolylaminomethyl)-2-benzothiazolinethiones and thiazolylamin omethyl)-6-bromo-2-benzothiazolinones inhibit photosynthetic processes in spinach chloroplasts and the chlorophyll production in Chlorella v ulgaris. The inhibitory activity depends on the alkyl chain length of the thioalkyl substituent. The site of action of the effectors studied is on the donor side of photosystem 2 before the site of action of di phenylcaxbazide. The highest antialgal effects were exhibited by compo unds containing bromine.