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

Beatrix Enderle, David J. Sheerin, Inyup Paik, Praveen Kumar Kathare, Philipp Schwenk, Cornelia Klose, Maximilian H. Ulbrich, Enamul Huq and Andreas Hiltbrunner ()
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Beatrix Enderle: Institute of Biology II, University of Freiburg
David J. Sheerin: Institute of Biology II, University of Freiburg
Inyup Paik: The University of Texas at Austin
Praveen Kumar Kathare: The University of Texas at Austin
Philipp Schwenk: Institute of Biology II, University of Freiburg
Cornelia Klose: Institute of Biology II, University of Freiburg
Maximilian H. Ulbrich: University of Freiburg
Enamul Huq: The University of Texas at Austin
Andreas Hiltbrunner: Institute of Biology II, University of Freiburg

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-02311-8

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