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Plant and Cell Physiology, 1997, Vol. 38, No. 9 1075-1079
© 1997

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

Kenko Uchida and Masaki Furuya1

Hitachi Advanced Research Laboratory Hatoyama, Saitama, 350–03 Japan

1To whom all correspondence should be addressed: TEL & FAX, + 81(492)96–7511; e-mail, mfuruya{at}harl.hitachi.co.jp

Phytochrome- and a blue light receptor-dependent pathway antagonistically regulate the first mitosis 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 germinating spores. Incorporation of the radioactivity of 3H-thymidine into the acid-insoluble 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.

( Accepted July 10, 1997)
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