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Nat Commun. 2017 Dec 20;8(1):2221. doi: 10.1038/s41467-017-02311-8.

PCH1 and PCHL promote photomorphogenesis in plants by controlling phytochrome B dark reversion.

Author information

1
Faculty of Biology, Institute of Biology II, University of Freiburg, 79104, Freiburg, Germany.
2
Department of Molecular Biosciences and The Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX, 78712, USA.
3
Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, 79104, Freiburg, Germany.
4
Department of Medicine, Renal Division, Freiburg University Medical Center, 79106, Freiburg, Germany.
5
BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104, Freiburg, Germany.
6
Faculty of Biology, Institute of Biology II, University of Freiburg, 79104, Freiburg, Germany. andreas.hiltbrunner@biologie.uni-freiburg.de.
7
Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, 79104, Freiburg, Germany. andreas.hiltbrunner@biologie.uni-freiburg.de.
8
BIOSS Centre for Biological Signalling Studies, University of Freiburg, 79104, Freiburg, Germany. andreas.hiltbrunner@biologie.uni-freiburg.de.

Abstract

Phytochrome B (phyB) is the primary red light photoreceptor in plants, and regulates both growth and development. The relative levels of phyB in the active state are determined by the light conditions, such as direct sunlight or shade, but are also affected by light-independent dark reversion. Dark reversion is a temperature-dependent thermal relaxation process, by which phyB reverts from the active to the inactive state. Here, we show that the homologous phyB-binding proteins PCH1 and PCHL suppress phyB dark reversion, resulting in plants with dramatically enhanced light sensitivity. Moreover, far-red and blue light upregulate the expression of PCH1 and PCHL in a phyB independent manner, thereby increasing the response to red light perceived by phyB. PCH1 and PCHL therefore provide a node for the molecular integration of different light qualities by regulation of phyB dark reversion, allowing plants to adapt growth and development to the ambient environment.

PMID:
29263319
PMCID:
PMC5738371
DOI:
10.1038/s41467-017-02311-8
[Indexed for MEDLINE]
Free PMC Article

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