PMID: 11607652Apr 16, 1996Paper

Twilight-zone and canopy shade induction of the Athb-2 homeobox gene in green plants

Proceedings of the National Academy of Sciences of the United States of America
Monica CarabelliI Ruberti

Abstract

We present evidence that a novel phytochrome (other than phytochromes A and B, PHYA and PHYB) operative in green plants regulates the "twilight-inducible" expression of a plant homeobox gene (Athb-2). Light regulation of the Athb-2 gene is unique in that it is not induced by red (R)-rich daylight or by the light-dark transition but is instead induced by changes in the ratio of R to far-red (FR) light. These changes, which normally occur at dawn and dusk (end-of-day FR), also occur during the daytime under the canopy (shade avoidance). By using pure light sources and phyA/phyB null mutants, we demonstrated that the induction of Athb-2 by changes in the R/FR ratio is mediated for the most part by a novel phytochrome operative in green plants. Furthermore, PHYB plays a negative role in repressing the accumulation of Athb-2 mRNA in the dark and a minor role in the FR response. The strict correlation of Athb-2 expression with FR-induced growth phenomena suggests a role for the Athb-2 gene in mediating cell elongation. This interpretation is supported by the finding that the Athb-2 gene is expressed at high levels in rapidly elongating etiolated seedlings. Furthermore, as either R or FR light inhibits cell elongation in etiolated tis...Continue Reading

References

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Citations

Sep 2, 2008·Plant Molecular Biology·Angela Raffaella CiarbelliIda Ruberti
Sep 18, 2008·Plant Molecular Biology·David Alabadí, Miguel A Blázquez
Mar 8, 2005·Trends in Plant Science·Ruairidh J H SawersThomas P Brutnell
Oct 10, 1998·Biochimica Et Biophysica Acta·R L ChanD H Gonzalez
Sep 18, 2002·Trends in Plant Science·Giorgio Morelli, Ida Ruberti
Jan 29, 2000·The Plant Journal : for Cell and Molecular Biology·E MaydaP Vera
Sep 6, 2000·The Plant Journal : for Cell and Molecular Biology·E HuqP H Quail
Mar 22, 2001·The Plant Journal : for Cell and Molecular Biology·M OhgishiT Aoyama
Jan 11, 2013·Proceedings of the National Academy of Sciences of the United States of America·Wei HuJ Clark Lagarias
Oct 10, 2009·Journal of Experimental Botany·Keara A Franklin, Peter H Quail
Oct 12, 2012·Plant & Cell Physiology·Toshiaki KozukaAkira Nagatani
May 9, 2007·Bioscience, Biotechnology, and Biochemistry·Yuko NakamuraTakeshi Mizuno
Nov 8, 2011·Bioscience, Biotechnology, and Biochemistry·Hanayo Ueoka-NakanishiTakeshi Mizuno
Nov 14, 2007·Plant Molecular Biology·Adamantia AgalouPieter B F Ouwerkerk
Sep 6, 2011·Biotechnology Advances·I RubertiG Morelli
Jun 10, 2008·The New Phytologist·Keara A Franklin
Apr 10, 2008·The Plant Journal : for Cell and Molecular Biology·Zhefeng LinDon Grierson
Sep 16, 2006·The Plant Journal : for Cell and Molecular Biology·Pablo A ManavellaRaquel L Chan
Jun 15, 2013·The Plant Journal : for Cell and Molecular Biology·Nicolás Cifuentes-EsquivelJaime F Martínez-García
Nov 13, 2010·The Plant Journal : for Cell and Molecular Biology·Carlos D CroccoJavier F Botto
Feb 4, 2011·The Plant Journal : for Cell and Molecular Biology·Benjamin ColeJoanne Chory
Oct 24, 2009·The EMBO Journal·Patricia HornitschekChristian Fankhauser
Jun 11, 2003·The Journal of Urology·Arthur L Burnett
Apr 26, 2015·Journal of Experimental Botany·L TurchiI Ruberti
Aug 26, 2009·Plant Signaling & Behavior·Jordi Bou-TorrentJaime F Martínez-García
Jan 9, 2001·Seminars in Cell & Developmental Biology·N Kuno, M Furuya
Oct 21, 2016·PeerJ·Patricia Müller-MouléJulin N Maloof
Dec 12, 2003·Nature·Michael G SalterGarry C Whitelam
Sep 22, 2018·Journal of Experimental Botany·Monica CarabelliIda Ruberti
Nov 4, 1998·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·G C WhitelamP F Devlin
Oct 20, 2007·The EMBO Journal·Irma Roig-VillanovaJaime F Martínez-García

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