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http://hdl.handle.net/1942/15190
Title: | The role of the kinase OXI1 in cadmium- and copper-induced molecular responses in Arabidopsis thaliana | Authors: | SMEETS, Karen OPDENAKKER, Kelly REMANS, Tony Forzani, Celine Hirt, Heribert VANGRONSVELD, Jaco CUYPERS, Ann |
Issue Date: | 2013 | Publisher: | WILEY-BLACKWELL | Source: | PLANT CELL AND ENVIRONMENT, 36 (6), p. 1228-1238 | Abstract: | The hypothesis that mitogen-activated protein kinase (MAPK) signalling is important in plant defences against metal stress has become accepted in recent years. To test the role of oxidative signal-inducible kinase (OXI1) in metal-induced oxidative signalling, the responses of oxi1 knockout lines to environmentally realistic cadmium (Cd) and copper (Cu) concentrations were compared with those of wild-type plants. A relationship between OXI1 and the activation of lipoxygenases and other initiators of oxylipin production was observed under these stress conditions, suggesting that lipoxygenase-1 may be a downstream component of OXI1 signalling. Metal-specific differences in OXI1 action were observed. For example, OXI1 was required for the up-regulation of antioxidative defences such as catalase in leaves and Fe-superoxide dismutase in roots, following exposure to Cu, processes that may involve the MEKK1-MKK2-WRKY25 cascade. Moreover, the induction of Cu/Zn superoxide dismutases in Cu-exposed leaves was regulated by OXI1 in a manner that involves fluctuations in the expression of miRNA398. These observations contrast markedly with the responses to Cd exposure, which also involves OXI1-independent pathways but rather involves changes in components mediating intracellular communication. | Notes: | Hasselt Univ, Ctr Environm Sci, B-3590 Diepenbeek, Belgium. URGV Plant Genom, F-91057 Evry, France. | Keywords: | Plant Sciences;heavy metals; oxidative stress; signalling | Document URI: | http://hdl.handle.net/1942/15190 | ISSN: | 0140-7791 | e-ISSN: | 1365-3040 | DOI: | 10.1111/pce.12056 | ISI #: | 000318176800013 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2014 |
Appears in Collections: | Research publications |
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