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

Lei Jiang, Yan Wang, Lars Olof Björn, Shaoshan Li

Research output: Contribution to journalArticlepeer-review

37 Citations (SciVal)

Abstract

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.
Original languageEnglish
Pages (from-to)838-846
JournalPhotochemical and Photobiological Sciences
Volume8
DOIs
Publication statusPublished - 2009

Subject classification (UKÄ)

  • Biological Sciences

Keywords

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

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