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

Research output: Contribution to journalArticle

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

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Open

Documents

Original languageEnglish
JournalPlant, Cell and Environment
Early online date6 Jan 2017
DOIs
StateE-pub ahead of print - 6 Jan 2017
Externally publishedYes

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 46 simultaneous UVR8 signalling in different tissues
47 mediates, at least partly, developmental and defence responses to UV-B.

ID: 30097459