Add time:08/18/2019         Source:sciencedirect.com

Methods are given for obtaining spectral regimes related to algal absorption regions (red, green, violet) and to coastal, underwater light. Amphidinium and Biddulphia maintained for several months in these regimes have the same structure as when maintained in white light except Biddulphia in the red regime, in which there was breakdown in cytoplasmic structure, preponderance of large cells, and slower growth. Electron microscopy showed that the average number of thylakoid bands increased from 6.0 in white to 7.6 in red and appeared teased. Amphidinium did not show a gross morphological change but slower growth, crimping of bands, and increase in band number from 5.1 to 6.7 were observed. On the basis that increase in number and loss in compactness indicate stress, the stress effect of the regimes decreased from red, to green, to underwater, to white, and finally to violet.Algae grown in white light had their highest photosynthetic rate in the violet regime, then underwater, red, white, and green. When grown in any of the coloured regimes, the rate in violet was again highest. Changes in assimilation number for the different regimes compared with white light fell into three classes. First, both algae showed no change in green; there was also no pigment change with Amphidinium but a decrease with Biddulphia. Secondly, Amphidinium in red or underwater, and Biddulphia in red (before cytoplasmic breakdown) decreased their assimilaton number; this was accompanied by an increase in pigment, suggesting that the decreased usage of pigment in photosynthesis was due to increase in availability. Thirdly, Amphidinium in violet, and Biddulphia in underwater increased their assimilation number; this was accompanied by a decrease in pigments, suggesting that there was increased usage because of decreased availability, and that the pigment changes caused those in assimilation number.

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