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Plant Physiol. 2018 May;177(1):75-81. doi: 10.1104/pp.18.00048. Epub 2018 Mar 12.

Perception of Sunflecks by the UV-B Photoreceptor UV RESISTANCE LOCUS8.

Author information

1
IFEVA, Universidad de Buenos Aires and CONICET, Facultad de Agronomía, 1417 Buenos Aires, Argentina.
2
Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland.
3
Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires-CONICET, 1417 Buenos Aires, Argentina.
4
Department of Botany and Plant Biology, Section of Biology, Faculty of Sciences, University of Geneva, 1211 Geneva 4, Switzerland roman.ulm@unige.ch casal@ifeva.edu.ar.
5
IFEVA, Universidad de Buenos Aires and CONICET, Facultad de Agronomía, 1417 Buenos Aires, Argentina roman.ulm@unige.ch casal@ifeva.edu.ar.

Abstract

Sunflecks, transient patches of light that penetrate through gaps in the canopy and transiently interrupt shade, are eco-physiologically and agriculturally important sources of energy for carbon gain, but our molecular understanding of how plant organs perceive and respond to sunflecks through photoreceptors remains limited. The UV-B photoreceptor UV RESISTANCE LOCUS8 (UVR8) is a recent addition to the list of plant photosensory receptors, and we have made considerable advances in our understanding of the physiology and molecular mechanisms of action of UVR8 and its signaling pathway. However, the function of UVR8 in the natural environment is poorly understood. Here, we show that the UVR8 dimer/monomer ratio responds quantitatively and reversibly to the intensity of sunflecks that interrupt shade in the field. Sunflecks reduced hypocotyl growth and increased CHALCONE SYNTHASE (CHS) and ELONGATED HYPOCOTYL5 gene expression and CHS protein abundance in wild-type Arabidopsis (Arabidopsis thaliana) seedlings, but the uvr8 mutant was impaired in these responses. UVR8 was also required for normal nuclear dynamics of CONSTITUTIVELY PHOTOMORPHOGENIC1. We propose that UVR8 plays an important role in the plant perception of and response to sunflecks.

PMID:
29530938
PMCID:
PMC5933136
DOI:
10.1104/pp.18.00048
[Indexed for MEDLINE]
Free PMC Article

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