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OXI1 protein kinase is required for plant immunity against Pseudomonas syringae in Arabidopsis.

Petersen, L.N. and Ingle, R.A. and Knight, M.R. and Denby, K.J. (2009) 'OXI1 protein kinase is required for plant immunity against Pseudomonas syringae in Arabidopsis.', Journal of experimental botany., 60 (13). pp. 3727-3735.

Abstract

Expression of the Arabidopsis Oxidative Signal-Inducible1 (OXI1) serine/threonine protein kinase gene (At3g25250) is induced by oxidative stress. The kinase is required for root hair development and basal defence against the oomycete pathogen Hyaloperonospora parasitica, two separate H2O2-mediated processes. In this study, the role of OXI1 during pathogenesis was characterized further. Null oxi1 mutants are more susceptible to both virulent and avirulent strains of the biotrophic bacterial pathogen Pseudomonas syringae compared with the wild type, indicating that OXI1 positively regulates both basal resistance triggered by the recognition of pathogen-associated molecular patterns, as well as effector-triggered immunity. The level of OXI1 expression appears to be critical in mounting an appropriate defence response since OXI1 overexpressor lines also display increased susceptibility to biotrophic pathogens. The induction of OXI1 after P. syringae infection spatially and temporally correlates with the oxidative burst. Furthermore, induction is reduced in atrbohD mutants and after application of DPI (an inhibitor of NADPH oxidases) suggesting that reactive oxygen species produced through NADPH oxidases drives OXI1 expression during this plant–pathogen interaction.

Item Type:Article
Keywords:Hyaloperonospora parasitica, Plant defence, Pseudomonas syringae, Reactive oxygen species, Signal transduction, Disease resistance, Oxidative burst, Defense response, Signaling pathways, Salicylic-acid, Cell-death, Mutant, H2O2, Accumulation, Activation.
Full text:PDF - Published Version (380Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1093/jxb/erp219
Publisher statement:This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/ 2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Record Created:06 Jun 2012 10:05
Last Modified:08 Jun 2012 11:55

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