Spadafora, Natasha and Doonan, John and Herbert, Rob and Bitonti, Beatrice M. and Wallace, Emily and Rogers, H.J. and Francis, D (2010) Arabidopsis T-DNA Insertional Lines For CDC25 Are Hypersensitive to Hydroxyurea But Not to Zeocin or Salt Stress. Annals of Botany. ISSN Electronic 1095-8290 - Print 0305-7364Full text not available from this repository. (Request a copy)
Background and Aims In yeasts and animals, cyclin-dependent kinases are key regulators of cell cycle progression and are negatively and positively regulated by WEE1 kinase and CDC25 phosphatase, respectively. In higher plants a full-length orthologue of CDC25 has not been isolated but a shorter gene with homology only to the C-terminal catalytic domain is present. The Arabidopis thaliana;CDC25 can act as a phosphatase in vitro. Since in arabidopsis, WEE1 plays an important role in the DNA damage/DNA replication checkpoints, the role of Arath;CDC25 in conditions that induce these checkpoints or induce abiotic stress was tested. Methods arath;cdc25 T-DNA insertion lines, Arath;CDC25 over-expressing lines and wild type were challenged with hydroxyurea (HU) and zeocin, substances that stall DNA replication and damage DNA, respectively, together with an abiotic stressor, NaCl. A molecular and phenotypic assessment was made of all genotypes Key Results There was a null phenotypic response to perturbation of Arath;CDC25 expression under control conditions. However, compared with wild type, the arath;cdc25 T-DNA insertion lines were hypersensitive to HU, whereas the Arath;CDC25 over-expressing lines were relatively insensitive. In particular, the over-expressing lines consistently outgrew the T-DNA insertion lines and wild type when challenged with HU. All genotypes were equally sensitive to zeocin and NaCl. Conclusions Arath;CDC25 plays a role in overcoming stress imposed by HU, an agent know to induce the DNA replication checkpoint in arabidopsis. However, it could not enhance tolerance to either a zeocin treatment, known to induce DNA damage, or salinity stress.
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|Uncontrolled Keywords:||Arabidopsis thaliana, cell cycle checkpoints, hydroxyurea, root growth, NaCl, zeocin|
|Subjects:||Q Science > QK Botany|
|Divisions:||Academic Departments > Institute of Science and the Environment|
|Depositing User:||Rob Herbert|
|Date Deposited:||08 Oct 2010 14:47|
|Last Modified:||15 Nov 2012 14:39|
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