The effect of spectral composition of light on morphogenesis of green coccoid algae (Chlorophyta)

The effect of different wave length light on the process of transformation of zoospores to vegetative cells in the representatives of three phyletic lines of green coccoid algae (Chlorophyceae s. str., Trebouxiophyceae, Bracteacoccus) was studied. Blue and green lights were morpholagically active for all strains, although sets of the most effective wave lengths were different for each species: for Parietochloris alveolaris Bold CALU-856 it was near 400 nm, and 525-550 nm; for Bracteacoccus minor (Chod.) Petrova CALU-825 it included wave length of 400, 480, 538, 550 nm. The most effective wave lengths for Spongiochloris typica Trainor et McLean CALU-854 were 400, 480, and 525 nm. Heightened sensibility to red light was found in S. typica (Chlorophyceae s. str.) which, probably, is connected with presence of phytochromes. Differences in the active spectra of morphogenesis are phyletically determined.