Photoperiodic Regulation of Cell Division and Chloroplast Replication in Heterosigma akashiwo

概要

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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-and-dark 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.
日本植物生理学会の論文