Expression of the UVR8 photoreceptor in different tissues reveals tissue autonomous features of UV-B signalling

Péter Bernula, Carlos Daniel Crocco, Adriana Beatriz Arongaus, Roman Ulm, Ferenc Nagy, Andras Viczian

Research output: Contribution to journalArticlepeer-review

Abstract

The Arabidopsis UV-B photoreceptor UV RESISTANCE LOCUS 8 (UVR8) orchestrates the expression of hundreds of genes, many of which can be associated with UV-B tolerance. UV-B does not efficiently penetrate into tissues, yet UV-B regulates complex growth and developmental responses. To unravel to what extent and how UVR8 located in different tissues contributes to UV-B-induced responses, we expressed UVR8 fused to the YELLOW FLUORESCENT PROTEIN (YFP) under the control of tissue-specific promoters in a uvr8 null mutant background. We show that (i) UVR8 localized in the epidermis plays a major role in regulating cotyledon expansion, and (ii) expression of UVR8 in the mesophyll is important to protect adult plants from the damaging effects of UV-B. We found that UV-B induces transcription of selected genes, including the key transcriptional regulator ELONGATED HYPOCOTYL 5 (HY5), only in tissues that express UVR8. Thus, we suggest that tissue-autonomous and simultaneous UVR8 signalling in different tissues mediates, at least partly, developmental and defence responses to UV-B.
Original languageEnglish
Pages (from-to)1104-1114
Number of pages11
JournalPlant, Cell and Environment
Volume40
Issue number7
Early online date6 Jan 2017
DOIs
Publication statusPublished - 27 Mar 2017

Keywords

  • Arabidopsis
  • tissue specificity
  • ultraviolet-B

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