Control of the Entry into S Phase by Phytochrome and Blue Light Receptor in the First Cell Cycle of Fern Spores

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Phytochrome- and a blue light receptor-dependent pathway antagonistically regulate the first mtitosis in spores of the fern Adiantum capillus-veneris L. This study focused on determining which phase(s) of the cell cycle is positively regulated by phytochrome and negatively regulated by a blue light receptor in germtinating spores. Incorporation of the radioactivity of 3^H-thymidine into the acid-in-soluble material prepared from the spores indicated that phytochrome in the PFR form induced the entry into S phase of the first cell cycle in the spores 20-28 h after irradiation with red light. Blue light treatment before or after red light treatment totally prevented the PFR-induced DNA synthesis. Brief irradiation with red, far-red or blue light showed no effects on mitosis if the irradiation was given 28 h after the red light induction, during S and M phases. These results indicate that phytochrome and a blue light receptor regulate the entry into S phase during the first cell cycle of fern spores.
日本植物生理学会の論文