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Interaction of COP1 and UVR8 regulates UV-B-induced photomorphogenesis and stress acclimation in Arabidopsis.

Favory, Jean-Jacques and Stec, Agnieszka and Gruber, Henriette and Rizzini, Luca and Oravecz, Attila and Funk, Markus and Albert, Andreas and Cloix, Catherine and Jenkins, Gareth I and Oakeley, Edward James and Seidlitz, Harald K and Nagy, Ferenc and Ulm, Roman (2009) Interaction of COP1 and UVR8 regulates UV-B-induced photomorphogenesis and stress acclimation in Arabidopsis. The EMBO Journal, 28 (5). pp. 591-601. ISSN 1460-2075

Abstract

The ultraviolet-B (UV-B) portion of the solar radiation functions as an environmental signal for which plants have evolved specific and sensitive UV-B perception systems. The UV-B-specific UV RESPONSE LOCUS 8 (UVR8) and the multifunctional E3 ubiquitin ligase CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) are key regulators of the UV-B response. We show here that uvr8-null mutants are deficient in UV-B-induced photomorphogenesis and hypersensitive to UV-B stress, whereas overexpression of UVR8 results in enhanced UV-B photomorphogenesis, acclimation and tolerance to UV-B stress. By using sun simulators, we provide evidence at the physiological level that UV-B acclimation mediated by the UV-B-specific photoregulatory pathway is indeed required for survival in sunlight. At the molecular level, we demonstrate that the wild type but not the mutant UVR8 and COP1 proteins directly interact in a UV-B-dependent, rapid manner in planta. These data collectively suggest that UV-B-specific interaction of COP1 and UVR8 in the nucleus is a very early step in signalling and responsible for the plant's coordinated response to UV-B ensuring UV-B acclimation and protection in the natural environment.

Item Type: Article
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Additional Information: author can archive post-print (ie final draft post-refereeing); Publisher's version/PDF cannot be used
Keywords: Arabidopsis; photomorphogenesis; plant– environment interaction; stress acclimation; UV-B
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Date Deposited: 14 Dec 2009 13:50
Last Modified: 31 Jan 2013 01:02
URI: https://oak.novartis.com/id/eprint/960

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