[Effectiveness of excitation energy migration in the phycobilisomes of red marine macroalgae]

Phycobilisomes (PBS) were isolated from talloms of sea red macroalgae: annual Gloiopeltis furcata from illuminated and shaded shoal and perennial Ahnfeltia tobuchiensis. The spectral changes have shown that R-phycoerythrin, phycocyanin, allophycocyanin, allophycocyanin B were contained in PBS of the algae under study. The efficiency of energy migration to the ultimate acceptor-allophycocyanin B is twice as low in Ahnfeltia tobuchiensis (0.41) as in that of Gloiopeltis furcata, which may be due to the difference in the tallom age. Greater efficiency of excitation energy transfer from phycoerythrin to phycocyanin (0.93), from phycocyanin to allophycocyanin (0.98), from the latter to allophycocyanin B (0.96), as well as from phycoerythrin to allophycocyanin B (0.89) in PBS of shaded G. furcata combined with a relatively higher content of R-phycoerythrin, seems to be the result of algae adaptation to low illumination conditions.