Nuclear divisions and cytokinesis during unicell and coenobia formation in synchronized cultures of Scenedesmus quadricauda (Turp.) Breb. (Chlorophyceae)

Mitotic activity, cytokinesis and arrangement of daughter cells within the parental wall are studied in synchronized cultures of Scenedesmus quadricauda, which yield either unicells or coenobia. Irrespective of the formation of either unicells or coenobia, no essential differences occur in the nuclear patterns and the positions of the cleavage planes. Only the stages of daughter cell arrangement differ significantly in these two cycles. Daughter unicells are arranged within the parental wall more or less radially, whereas daughter coenobia become arranged with their axis parallel to the axis of the mother cell.