Arabidopsis histidine kinase 5 regulates salt sensitivity and resistance against bacterial and fungal infection
Article first published online: 18 JAN 2012
© 2012 The Authors. New Phytologist © 2012 New Phytologist Trust
Special Issue: Featured papers on ‘Bioenergy trees’
Volume 194, Issue 1, pages 168–180, April 2012
How to Cite
Pham, J., Liu, J., Bennett, M. H., Mansfield, J. W. and Desikan, R. (2012), Arabidopsis histidine kinase 5 regulates salt sensitivity and resistance against bacterial and fungal infection. New Phytologist, 194: 168–180. doi: 10.1111/j.1469-8137.2011.04033.x
- Issue published online: 24 FEB 2012
- Article first published online: 18 JAN 2012
- Received: 28 November 2011, Accepted: 1 December 2011
- Arabidopsis histidine kinase 5;
- Botrytis cinerea;
- histidine kinase;
- Pseudomonas syringae;
- salt stress
- •The ability of plants to adapt to multiple stresses imposed by the natural environment requires cross-talk and fine-tuning of stress signalling pathways. The hybrid histidine kinase Arabidopsis histidine kinase 5 (AHK5) is known to mediate stomatal responses to exogenous and endogenous signals in Arabidopsis thaliana. The purpose of this study was to determine whether the function of AHK5 in stress signalling extends beyond stomatal responses.
- •Plant growth responses to abiotic stresses, tissue susceptibility to bacterial and fungal pathogens, and hormone production and metabolism of reactive oxygen species were monitored in a T-DNA insertion mutant of AHK5.
- •The findings of this study indicate that AHK5 positively regulates salt sensitivity and contributes to resistance to the bacterium Pseudomonas syringae pv. tomato DC3000 and the fungal pathogen Botrytis cinerea.
- •This is the first report of a role for AHK5 in the regulation of survival following challenge by a hemi-biotrophic bacterium and a necrotrophic fungus, as well as in the growth response to salt stress. The function of AHK5 in regulating the production of hormones and redox homeostasis is discussed.