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Issue 9, 2002
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Gene regulation by low level UV-B radiation: identification by DNA array analysis

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Abstract

UV-B radiation alters transcript levels of various defence genes and photosynthetic genes in plants. Utilising a DNA array with 5000 ESTs and cDNAs from Arabidopsis thaliana, 70 genes were found to show a greater than two-fold induction or repression of transcript levels. Six genes (MEB5.2, PyroA, Ubq3, Lhcb6, F5D21.10 and the gene for an RNA polymerase II subunit) were tested for stress specific gene regulation on northern blots with RNA from plants exposed to low dose UV-B radiation, ozone or wounding. Transcript levels for PyroA, Ubq3 and the gene for a RNA polymerase II subunit were all specifically increased by UV-B. MEB5.2 mRNA levels also rose, whereas Lhcb6 and F5D21.10 transcript levels decreased under all stresses. The PyroA gene product in fungi is needed for biosynthesis of pyridoxine, and might have a role in protection against singlet oxygen. The Ubq3 gene encodes the ubiquitin protein that is attached to proteins destined for degradation. MEB5.2 and F5D21.10 represent novel gene products whose function have not yet been identified. Pairwise comparisons between the UV-B inducible promoters have identified a series of elements present in the MEB5.2 and PyroA promoters, absent from promoters of genes for early phenylpropanoid metabolism and that may be responsible for modulating their UV-B responses.

Graphical abstract: Gene regulation by low level UV-B radiation: identification by DNA array analysis

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Publication details

The article was received on 18 Mar 2002, accepted on 25 Jun 2002 and first published on 23 Jul 2002


Article type: Paper
DOI: 10.1039/B202659G
Citation: Photochem. Photobiol. Sci., 2002,1, 656-664
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    Gene regulation by low level UV-B radiation: identification by DNA array analysis

    M. Brosché, M. A. Schuler, I. Kalbina, L. Connor and Å. Strid, Photochem. Photobiol. Sci., 2002, 1, 656
    DOI: 10.1039/B202659G

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