Abstract
Summary Cotyledons of black pine ( Pinus nigra Arn.) seedlings grown under different irradiance and spectral quality of light have adapted in such a manner as to have the light quality effecting predominantly the Chl a/b ratio, the polypeptide structure of Chl a/b proteins of the LHC-2 and the ratio of the reaction centres of the PS2/PS1 Chl a proteins. The most pronounced differences of the Chl a/b and Chl a/ carotenoid ratios occurred in red and blue light. Red effected the greatest accumulation of Chl b , followed by the greatest accumulation of Chl a/b proteins of the LHC-2 complex. The proportion of the PS2/PS 1 Chl a protein core was lower in all light qualities than in the white of the same irradiance. The examined light qualities proved favourable for the excitation of PS2. The Chl a/b ratio in chloroplasts of plants grown in either blue, green or yellow did not follow the level of LHC-2 proteins.
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