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Chlorophyll (Chl) a and Chl b contents, rate of CO2 gas exchange, quenching coefficients of chlorophyll fluorescence, and endogenous phytohormones have been studied in primary leaves of barley seedlings cultivated under blue (BL) or red (RL) light. Photon flux densities (PFD) were between 0.3 and 12 μmol m-2 s-1. Plants grown at PFD of 0.3 μmol m-2 s-1 demonstrated in BL tenfold and in RL threefold...