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

Bernula, Péter; Crocco, Carlos; Arongaus, Adriana Beatriz; Ulm, Roman; Nagy, Ferenc; Viczián, András

doi:10.1111/pce.12904

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Title		Expression of the UVR8 photoreceptor in different tissues reveals tissue-autonomous features of UV-B signalling
Authors		Bernula, Péter Crocco, Carlos Arongaus, Adriana Beatriz Ulm, Roman Nagy, Ferenc Viczián, András
Published in		Plant, Cell and Environment. 2017, vol. 40, no. 7, p. 1104-1114
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 (1) UVR8 localized in the epidermis plays a major role in regulating cotyledon expansion, and (2) 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.
Identifiers		DOI: 10.1111/pce.12904 PMID: 28058744
Full text		Article (Published version) (6.8 MB) - Limited access to UNIGE
Structures		Faculté des sciences / Section de biologie / Département de botanique et biologie végétale
Research group		Groupe Ulm
Project		FNS: 31003A_153475
Citation (ISO format)		BERNULA, Péter et al. Expression of the UVR8 photoreceptor in different tissues reveals tissue-autonomous features of UV-B signalling. In: Plant, Cell and Environment, 2017, vol. 40, n° 7, p. 1104-1114. doi: 10.1111/pce.12904 https://archive-ouverte.unige.ch/unige:94657