Ca2+/calmodulin regulates salicylic-acid-mediated plant immunity

Liqun Du, Gul S. Ali, Kayla A. Simons, Jingguo Hou, Tianbao Yang, A. S. N. Reddy and B. W. Poovaiah ()
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Liqun Du: Center for Integrated Biotechnology and Department of Horticulture,
Gul S. Ali: Colorado State University, Fort Collins, Colorado 80523-1878, USA
Kayla A. Simons: Center for Integrated Biotechnology and Department of Horticulture,
Jingguo Hou: Washington State University, Pullman, Washington 99164-6414, USA
Tianbao Yang: Center for Integrated Biotechnology and Department of Horticulture,
A. S. N. Reddy: Colorado State University, Fort Collins, Colorado 80523-1878, USA
B. W. Poovaiah: Center for Integrated Biotechnology and Department of Horticulture,

Nature, 2009, vol. 457, issue 7233, 1154-1158

Abstract: Plant immunity: calcium/salicylic acid link Plant cells sense pathogens evoking a defence system that confers resistance to infection. One of the earliest steps in the plant defence pathway involves an increase in cytosolic calcium levels. However, the mechanisms by which Ca2+ signals result in an effective plant immune response are unclear. Salicylic acid is a key messenger for local and systemic resistance. In this study, Du et al. report a novel link between Ca2+signalling and salicylic acid-mediated responses. They show that AtSR1/CAMTA3, a Ca2+/calmodulin-binding transcription factor, negatively regulates salicylic acid responses by repressing EDS1, a key regulator of salicylic acid. Mutating AtSR1 results in an increase in salicylic acid levels and enhanced resistance to pathogens such as Pseudomonas syringae. Hence AtSR1 is a negative regulator of plant immunity by suppressing biosynthesis of salicylic acid.

Date: 2009
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DOI: 10.1038/nature07612

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