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Plant Physiol, January 2000, Vol. 122, pp. 147-156

Elementary Processes of Photoperception by Phytochrome A for High-Irradiance Response of Hypocotyl Elongation in Arabidopsis1,2

Tomoko Shinomura, Kenko Uchida, and Masaki Furuya*

Hitachi Advanced Research Laboratory, Hatoyama, Saitama 350-0395, Japan.

Elementary processes of photoperception by phytochrome A (PhyA) for the high-irradiance response (HIR) of hypocotyl elongation in Arabidopsis were examined using a newly designed irradiator with LED. The effect of continuous irradiation with far-red (FR) light could be replaced by intermittent irradiation with FR light pulses if given at intervals of 3 min or less for 24 h. In this response, the Bunsen-Roscoe law of reciprocity held in each FR light pulse. Therefore, we determined the action spectrum for the response by intermittent irradiation using phyB and phyAphyB double mutants. The resultant action spectrum correlated well with the absorption spectrum of PhyA in far-red-absorbing phytochrome (Pfr). Intermittent irradiation with 550 to 667 nm of light alone had no significant effect on the response. In contrast, intermittent irradiation with red light immediately after each FR light pulse completely reversed the effect of FR light in each cycle. The results indicate that neither red-absorbing phytochrome synthesized in darkness nor photoconverted Pfr are physiologically active, and that a short-lived signal is induced during photoconversion from Pfr to red-absorbing phytochrome. The mode of photoperception by PhyA for HIR is essentially different from that by PhyA for very-low-fluence responses and phytochrome B for low-fluence responses.


1 This work was carried out under Hitachi Advanced Research Laboratory project (no. B2023) and National Institute for Basic Biology Cooperative Research Program for the Okazaki large spectrograph (grant nos. 97-524 and 98-522). Research was partly supported by a grant from the Program for Promotion of Basic Research Activity for Innovative Biosciences to M.F.

2 This paper is dedicated to Hans Mohr who had made the greatest contribution to HIR.

* Corresponding author; e-mail mfuruya{at}harl.hitachi.co.jp; fax 81-492-96-7511.

© 2000 American Society of Plant Physiologists



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