The effect of colour light on production of zooids in 10 strains of the green chlorococcal alga Scenedesmus obliquus

The effect of lights of different spectral composition on the life cycle of 10 strains of Scenedesmus(Acutodesmus) obliquus (Turp.)Kutz. was studied. Subcultures from synchronous mother culture grown under standard conditions were withdrawn at 0, 4, 8, and 16 hours intervals and the dense cultures exposed in nitrogen free medium, temperature 15°C and various intensities of white, blue, red, or green light. Motile cells were observed only at cultures grown under blue or green light. Their number was independent on light intensity in tested span of irradiances (5, 25 and 50 μmol.m-2) that indicates signal role of blue and green light rather than a source of energy. The concentration of motile cells was dependent on developmental stage of cells shifted into the gametogenic conditions. It was proven that production of motile cells is strain specific because they were observed only in the two strains of ten tested.

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