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Plant and Cell Physiology, 1982, Vol. 23, No. 7 1305-1308
© 1982

Short Communication

Changes in Phytochrome Content during Imbibition in Spores of the Fern Lygodium japonicum

Ken-ichi Tomizawa1,2, Katsushi Manabe1 and Michizo Sugai2,3

1Department of Biology, Yokohama City University Setu 22-2, Kanazawa-ku, Yokohama 236, Japan
2Department of Biology, Faculty of Science, Toyama University Gofuku 3190, Toyama 930, Japan

3To whom reprint requests should be addressed

The phytochrome content was determined in intact fern spores of Lygodium japonicum (Thunb.) Sw. by difference spectrophotometry. The spectral characteristics thus estimated in spores which had been imbibed for 9 days in darkness were: far-red maximum at 730±2.5 nm, red maximum at 662±1.5 nm and isosbestic point at 684.5±1.4 nm. A detectable amount of phytochrome first appeared after 3 days of dark imbibition, and the level then increased during the rest of the imbibition period. On the 7th day, the phytochrome content leveled off. During the dark imbibition period, the phytochrome was revealed to be in the PR form.

(Received February 22, 1982; Accepted July 9, 1982)
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