Drought tolerance in Arabidopsis is controlled by the OCP3 disease resistance regulator
Article first published online: 27 FEB 2009
© 2009 The Authors. Journal compilation © 2009 Blackwell Publishing Ltd
The Plant Journal
Volume 58, Issue 4, pages 578–591, May 2009
How to Cite
Ramírez, V., Coego, A., López, A., Agorio, A., Flors, V. and Vera, P. (2009), Drought tolerance in Arabidopsis is controlled by the OCP3 disease resistance regulator. The Plant Journal, 58: 578–591. doi: 10.1111/j.1365-313X.2009.03804.x
- Issue published online: 14 MAY 2009
- Article first published online: 27 FEB 2009
- Received 21 October 2008; revised 19 December 2008; accepted 8 January 2009; published online 27 February 2009.
- transcriptional factor
Water scarcity and corresponding abiotic drought stress is one of the most important factors limiting plant performance and yield. In addition, plant productivity is severely compromised worldwide by infection with microbial pathogens. Two of the most prominent pathways responsible for drought tolerance and disease resistance to fungal pathogens in Arabidopsis are those controlled by the phytohormones abscisic acid (ABA) and the oxylipin methyl jasmonate (MeJA), respectively. Here, we report on the functional characterization of OCP3, a transcriptional regulator from the homeodomain (HD) family. The Arabidopsis loss-of-function ocp3 mutant exhibits both drought resistance and enhanced disease resistance to necrotrophic fungal pathogens. Double-mutant analysis revealed that these two resistance phenotypes have different genetic requirements. Whereas drought tolerance in ocp3 is ABA-dependent but MeJA-independent, the opposite holds true for the enhanced disease resistance characteristics. These observations lead us to propose a regulatory role of OCP3 in the adaptive responses to these two stresses, functioning as a modulator of independent and specific aspects of the ABA- and MeJA-mediated signal transduction pathways.