PMID: 11319034Apr 25, 2001Paper

Interactions within a network of phytochrome, cryptochrome and UV-B phototransduction pathways regulate chalcone synthase gene expression in Arabidopsis leaf tissue

The Plant Journal : for Cell and Molecular Biology
H K WadeG I Jenkins

Abstract

The Arabidopsis gene encoding the key flavonoid biosynthesis enzyme chalcone synthase (CHS) is regulated by several environmental and endogenous stimuli. Here we dissect the network of light signalling pathways that control CHS expression in mature leaves using cryptochrome (cry) and phytochrome (phy) deficient mutants. The UV-A/blue light induction of CHS is mediated principally by cry1, but neither cry1 nor cry2 is involved in UV-B induction or in the UV-A and blue light signalling pathways that interact synergistically with the UV-B pathway to enhance CHS expression. Moreover, these synergistic responses do not require phyA or phyB. Phytochrome is a positive regulator of the cry1 inductive pathway, mediating distinct potentiation and coaction effects. A red light pretreatment enhances subsequent cry1-mediated CHS induction. This potentiation is unaltered in phyA and phyB mutants but much reduced in a phyA phyB double mutant, indicating that it requires principally phyA or phyB. In contrast, the cry1-mediated induction of CHS, without pretreatment, is much reduced in phyB but not phyA mutants, indicating coaction between cry1 and phyB. Further experiments with phy-deficient mutants demonstrate that phyB is a negative regulato...Continue Reading

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Citations

Aug 29, 2013·Journal of Plant Research·Yasuko Kadomura-IshikawaAkira Takahashi
Oct 2, 2013·Journal of Photochemistry and Photobiology. B, Biology·Vladimir D KreslavskiSuleyman I Allakhverdiev
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Jul 31, 2010·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Marcos Vinicius Leal-CostaEliana Schwartz Tavares
Nov 28, 2001·The Plant Journal : for Cell and Molecular Biology·K M Folta, E P Spalding
Dec 17, 2008·Proceedings of the National Academy of Sciences of the United States of America·Hongyun TongZheng-Hui He
Sep 30, 2010·Plant Physiology·Seok-Won JeongYoun-Il Park
Jul 25, 2007·Photochemistry and Photobiology·Joe H SullivanJames Slusser
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Nov 7, 2006·Plant Cell Reports·Jong-Sug ParkKang-Jin Cho

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