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Plant and Cell Physiology, 1987, Vol. 28, No. 6 1093-1099
© 1987

Article

Photoperiodic Regulation of Cell Division and Chloroplast Replication in Heterosigma akashiwo

Emi Satoh1, Makoto M. Watanabe2 and Tadashi Fujii1

1Institute of Biological Sciences, University of Tsukuba Sakura-mura, Ibaraki 305, Japan
2Water and Soil Environment Division, The National Institute for Environmental Studies Yatabe-machi, Tsukuba, Ibaraki 305, Japan

Cell division and chloroplast replication in Heterosigma akashiwo (Hada) Hada occurred as separate synchronous events during the cell cycle when cells were subjected to light-dark regimes. Under three different photoperiodic cycles of 10L/14D (10 h light/14 h dark), 12L/12D or 16L/8D, cell division began at hour 19–20 and finished at hour 23–26 after the onset of the light period, while chloroplast replication began at hour 20–22 after the onset of the dark period. Almost all the cells divided only once in the 12L/12D cycle. The rate of increase in chloroplast number during one light-anddark cycle was always equal to that in cell number in every photoperiod examined.

Light was essential for both cell division and chloroplast replication, but the minimum light period necessary for each event differed. When the light period was shorter than 6 h, no cell division occurred; when it was shorter than 3 h, no chloroplast replication occurred.

(Received February 26, 1987; Accepted June 17, 1987)
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