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THE PLANT CELL, Vol 7, Issue 12 2187-2196, Copyright © 1995 by American Society of Plant Biologists

RESEARCH ARTICLES

Phytochrome A and Phytochrome B Mediate the Hypocotyl-Specific Downregulation of TUB1 by Light in Arabidopsis

W. M. Leu, X. L. Cao, T. J. Wilson, D. P. Snustad and N. H. Chua
Laboratory of Plant Molecular Biology, The Rockefeller University, New York, New York 10021-6399

Arabidopsis contains six [alpha]-tubulin and nine [beta]-tubulin genes that are expressed in a tissue-specific and developmentally regulated manner. We analyzed the effects of light on tubulin mRNA abundance in Arabidopsis seedlings using RNA gel blot hybridizations and gene-specific probes. Transcript levels of all 15 tubulin genes were decreased by continuous white light, although to different degrees. Detailed analysis was performed with the [beta]-tubulin TUB1 gene. The transcript level of TUB1 was high in etiolated seedlings and decreased to ~20% of the dark mRNA level after 2 to 6 hr of white light treatment. We showed that this downregulation requires high-irradiance light treatment and that multiple photoreceptors are involved. In particular, using phytochrome mutants and narrow wave band light, we demonstrated that both the phytochrome A (phyA)-mediated far-red light high-irradiance response and the phytochrome B (phyB)-mediated red light high-irradiance response are involved in the downregulation of TUB1 expression by white light. Histochemical analysis of transgenic plants expressing a TUB1-[beta]-glucuronidase chimeric transgene indicated that the downregulation observed only in hypocotyls and not in roots is controlled transcriptionally.


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