UV-B detected by the UVR8 photoreceptor antagonizes auxin signaling and plant shade avoidance

Scott Hayes, Christos Velanis, Gareth Jenkins, Keara A Franklin

Research output: Contribution to journalArticle (Academic Journal)peer-review

127 Citations (Scopus)


Plants detect different facets of their radiation environment via specific photoreceptors to modulate growth and development. UV-B is perceived by the photoreceptor UV RESISTANCE LOCUS 8 (UVR8). The molecular mechanisms linking UVR8 activation to plant growth are not fully understood, however. When grown in close proximity to neighboring vegetation, shade-intolerant plants initiate dramatic stem elongation to overtop competitors. Here we show that UV-B, detected by UVR8, provides an unambiguous sunlight signal that inhibits shade avoidance responses in Arabidopsis thaliana by antagonizing the phytohormones auxin and gibberellin. UV-B triggers degradation of the transcription factors PHYTOCHROME INTERACTING FACTOR 4 and PHYTOCHROME INTERACTING FACTOR 5 and stabilizes growth-repressing DELLA proteins, inhibiting auxin biosynthesis via a dual mechanism. Our findings show that UVR8 signaling is closely integrated with other photoreceptor pathways to regulate auxin signaling and plant growth in sunlight.
Original languageEnglish
Pages (from-to)11894-11899
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number32
Early online date28 Jul 2014
Publication statusPublished - 12 Aug 2014


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