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The changes in chlorophyll fluorescence during a two hour period of high light were analyzed in cyanobacterium Nostoc linckia AICB 421. A light intensity of 800 µmoli.m^-2.s^-1 induced the decrease of Fm, Fv and maximal and effective quantum yield. In conditions of exposure to 1500 µmoli.m^-2.s^-1, F₀, F_m, Fv and maximal and effective quantum yield decreased also, relative to control. A 2100 µmoli.m^-2.s^-1 light intensity increased the F₀, Fm and Fv and the quantum yield values lowered. Photochemical coefficients maintained maximal values. Quantum yield of non-regulated energy dissipation Y(NO) was enhanced. Changes in chlorophyll fluorescence were caused by structural changes in the antenna and in the PSII reaction center, due to light stress.

Keywords: minimal and maximal fluorescence, maximal and effective quantum yield, quantum yield of nonregulated energy dissipation, coefficient of photochemical quenching, phycobilisomes.