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Plant Cell, Vol. 12, 1063-1078, July 2000, Copyright © 2000, American Society of Plant Physiologists

Light-Induced Nuclear Translocation of Endogenous Pea Phytochrome A Visualized by Immunocytochemical Procedures

Akiko Hisadaa, Hiroko Hanzawaa, James L. Wellerb, Akira Nagatanic, James B. Reidb, and Masaki Furuyaa
a Hitachi Advanced Research Laboratory, Hatoyama, Saitama 350-0395, Japan
b School of Plant Science, University of Tasmania, G.P.O. Box 252-55, Hobart, Tasmania 7001, Australia
c Department of Botany, Graduate School of Science, Kyoto University, Kitashirakawa, Kyoto 606-8502, Japan

Correspondence to: Masaki Furuya, mfuruya{at}harl.hitachi.co.jp (E-mail), 81-492-96-7511 (fax)

Although the physiological functions of phytochrome A (PhyA) are now known, the distribution of endogenous PhyA has not been examined. We have visualized endogenous PhyA apoprotein (PHYA) by immunolabeling cryosections of pea tissue, using PHYA-deficient mutants as negative controls. By this method, we examined the distribution of PHYA in different tissues and changes in its intracellular distribution in response to light. In apical hook cells of etiolated seedlings, PHYA immunolabeling was distributed diffusely in the cytosol. Exposure to continuous far-red (cFR) light caused a redistribution of the immunolabeling to the nucleus, first detectable after 1.5 hr and greatest at 4.5 hr. During this time, the amounts of spectrally active phytochrome and PHYA did not decline substantially. Exposure to continuous red (cR) light or to a brief pulse of red light also resulted in redistribution of immunolabeling to the nucleus, but this occurred much more rapidly and with a different pattern of intranuclear distribution than it did in response to cFR light. Exposures to cR light resulted in loss of immunolabeling, which was associated with PHYA degradation. These results indicate that the light-induced intracellular location of PHYA is wavelength dependent and imply that this is important for PhyA activity.




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