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Scientific article
English

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

Published inPlant, cell & environment, vol. 40, no. 7, p. 1104-1114
Publication date2017
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.

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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 & environment, 2017, vol. 40, n° 7, p. 1104–1114. doi: 10.1111/pce.12904
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ISSN of the journal0140-7791
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