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Plant and Cell Physiology, 1974, Vol. 15, No. 6 1017-1026
© 1974

Article

Control of cell division in a green alga, Ankistrodesmus gracilis

Mikio Kobayashi

Biological Institute, Faculty of Science, Nagoya University Chikusa-ku, Nagoya 464, Japan

The proliferation pattern of Ankistrodesmus gracilis, a species of Chlorococcales, is described. Under standard conditions, various proliferation patterns; di-, tri-, tetra-, or multichotomical cell division were observed. Light-dark diurnal rhythms, LD 12 : 12 and 14 : 10 induced growth patterns which formed two- to several-ten-celled colonies, whereas the rhythms LD 16 : 8 to 20 : 4 induced only the formation of two-celled colonies. These inductions were observed at a cell density of 4.0×106 cells/ml. Dichotomical cell division occured at a cell density of more than 1.5×107 cells/ml. No influence of self-shading on the pattern of colony formation was detected.

(Received May 30, 1974; )
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