Control of the entry into S phase by phytochrome and blue light receptor in the first cell cycle of fern [Adiantum capillus-veneris] spores
1997
Uchida, K. (Hitachi Ltd., Hatoyama, Saitama (Japan)) | Furuya, M.
Phytochrome- and a blue light receptor-dependent pathway antagonistically regulate the first mitosis in spores of the fern Adiantum capillus-veneria 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 germinating spores. Incorporation of the radioactivity of 3H-thymidine into the acid-insoluble material prepared from the spores indicated that phytochrome in the P(FR) 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 P(FR)-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
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