Issue 6, 2009
From the journal:

Photochemical & Photobiological Sciences

Arabidopsis RADICAL-INDUCED CELL DEATH1 is involved in UV-Bsignaling†

Lei Jiang,a   Yan Wang,ab   Lars Olof Björnac  and  Shaoshan Li*a  

* Corresponding authors

a Key Laboratory of Ecology and Environmental Science in Guangdong Higher Education, School of Life Science, South China Normal University, Guangzhou, China
E-mail: lishsh@scnu.edu.cn
Fax: +86 20 8521 7626
Tel: +86 20 8521 7626

b Department of Environmental Engineering, College of Science & Engineering, Jinan University, Guangzhou, China

c Department of Cell and Organism Biology, Lund University, Sölvegatan 35, Lund, Sweden

Abstract

The Arabidopsisradical-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.

Graphical abstract: Arabidopsis RADICAL-INDUCED CELL DEATH1 is involved in UV-B signaling

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Article information

DOI
https://doi.org/10.1039/B901187K
Article type
Paper
Submitted
20 Jan 2009
Accepted
20 Mar 2009
First published
09 Apr 2009

Photochem. Photobiol. Sci., 2009,8, 838-846

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

L. Jiang, Y. Wang, L. O. Björn and S. Li, Photochem. Photobiol. Sci., 2009, 8, 838 DOI: 10.1039/B901187K

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