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Title of Journal: Plant Mol Biol

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Abbravation: Plant Molecular Biology

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Springer Netherlands

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DOI

10.1007/s100060050178

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ISSN

1573-5028

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Overexpression of Emphasis Type="Italic"Arabidop

Authors: Wesam M Al Khateeb Dana F Schroeder
Publish Date: 2009/03/14
Volume: 70, Issue: 4, Pages: 371-383
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Abstract

Damaged DNA Binding protein 1 DDB1 is a conserved protein and a component of multiple cellular complexes Arabidopsis has two homologues of DDB1 DDB1A and DDB1B In this study we examine the role of DDB1A in Arabidopsis UV tolerance and DNA repair using a DDB1A null mutant ddb1a and overexpression lines DDB1A overexpression lines showed higher levels of UVresistance than wildtype in a range of assays as well as faster DNA repair However a significant difference between wildtype plants and ddb1a mutants was only observed immediately following UV treatment in root length and photoproduct repair assays DDB1A and DDB1B mRNA levels increased 3 h after UV exposure and DDB1A is required for UV regulation of DDB1B and DDB2 mRNA levels In conclusion while DDB1A is sufficient to increase Arabidopsis UV tolerance it is only necessary for immediate response to UV damageThe authors thank Yu Zhang Mehdi Sefidgar David Collister Lana Rosenfeld Avril Hatherell and Mala Vijayakumar for technical assistance and David Bird and Fawzi Razem for critical suggestions The work was supported by a grant from the Natural Sciences and Engineering Research Council of Canada to DFS

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