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Plant and Cell Physiology, 1985, Vol. 26, No. 4 669-674
© 1985

Article

Inductive and Inhibitory Effects of Light on Cell Division in Chattonella antiqua

Yasuyuki Nemota and Masaki Furuya

Department of Botany, Faculty of Science, University of Tokyo Hongo, Tokyo 113, Japan

The cell division of a red tide flagellate, Chattonella antiqua, was synchronously induced under light and dark regimes of 10L14D (a light period, L, for 10 h followed by a dark period, D, for 14 h), 12L12D and l4L10D. In all regimes cell number began to increase ca. 14 h after the onset of L and almost doubled during one LD cycle. When the light-off timing of the last L was changed or the whole L was shifted, cells that had been synchronized under 12L12D invariably began to divide ca. 14 h after the onset of L. This shows that the timing of cell division was determined by the time of the onset of L.

When cells were continuously exposed to light after a cell division, the subsequent cell division was inhibited. This effect was limited to cells that had been synchronized under short-day conditions.

Thus it can be concluded that light has both inductive and inhibitory effects on cell division in this alga, the latter effect depending upon the previously given light and dark regimes.

(Received December 21, 1984; Accepted February 28, 1985)
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