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Arabidopsis RADICAL-INDUCED CELL DEATH1 is involved in UV-B signaling.

  • Lei Jiang
  • Yan Wang
  • Lars Olof Björn
  • Shaoshan Li
Publishing year: 2009
Language: English
Pages: 838-846
Publication/Series: Photochemical and Photobiological Sciences
Volume: 8
Document type: Journal article
Publisher: Royal Society of Chemistry

Abstract english

The Arabidopsis radical-induced cell death1 (rcd1) mutant is sensitive to ozone fumigation and

apoplastic superoxide, but tolerant to methyl viologen. In the present article, we report that the rcd1

mutant is also tolerant to supplementary UV-B radiation. The rcd1-1 mutant exhibits less accumulation

of TT dimers, increased hypocotyl growth inhibition and higher accumulation of flavonoids under

supplemental UV-B radiation. Moreover, the expression of HY5 (ELONGATED HYPOCOTYL5) is

increased in the mutant after UV-B treatment. Gene expression downstream of UV-B signaling reveals

that COP1 (CONSTITUTIVELY PHOTOMORPHOGENIC1)-regulated genes have an elevated

expression in rcd1-1 mutant under UV-B radiation, while expression of UVR8 (UV RESISTANCE

LOCUS 8)-regulated and HY5-independent genes are not changed. Interestingly, the expression of

RCD1 genes is not significantly changed by UV-B radiation. Previous study has shown that STO

protein is interacting with RCD1 in vitro. Here, we found the mRNA level of STO (SALT

TOLERANCE) is greatly increased in rcd1-1 mutant after UV-B radiation. However, UV-B-induced

HY5 and CHS expression is partially inhibited in sto mutant. Based on the above results, it is deduced

that the RCD1, working together with STO, is involved in Arabidopsis UV-B signaling.


  • Biological Sciences
  • UV-B
  • ultraviolet radiation
  • signaling
  • Arabidopis
  • rcd1


  • Photobiology
  • Photobiology-lup-obsolete
  • ISSN: 1474-9092
Lars Olof Björn
E-mail: lars_olof [dot] bjorn [at] biol [dot] lu [dot] se

Professor emeritus

Molecular Cell Biology

+46 46 222 72 53