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Article Dans Une Revue Scientific Reports Année : 2017

PRR2, a pseudo-response regulator, promotes salicylic acid and camalexin accumulation during plant immunity

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Calcium signalling mediated by Calmodulin (CaM) and calmodulin-like (CML) proteins is critical to plant immunity. CaM and CML regulate a wide range of target proteins and cellular responses. While many CaM-binding proteins have been identified, few have been characterized for their specific role in plant immunity. Here, we report new data on the biological function of a CML-interacting partner, PRR2 (PSEUDO-RESPONSE REGULATOR 2), a plant specific transcription factor. Until now, the physiological relevance of PRR2 remained largely unknown. Using a reverse genetic strategy in A. thaliana, we identified PRR2 as a positive regulator of plant immunity. We propose that PRR2 contributes to salicylic acid (SA)-dependent responses when challenged with the phytopathogenic bacterium Pseudomonas syringae. PRR2 is transcriptionally upregulated by SA and P. syringae, enhances SA biosynthesis and SA signalling responses; e.g. in response to P. syringae, PRR2 induces the production of SA and the accumulation of the defence-related protein PR1. Moreover, PRR2 overexpressing lines exhibit an enhanced production of camalexin, a phytoalexin that confers enhanced resistance against pathogens. Together, these data reveal the importance of PRR2 in plant immune responses against P. syringae and suggest a novel function for this particular plant specific transcription factor in plant physiology.

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hal-03611666 , version 1 (17-03-2022)
hal-03611666 , version 2 (22-03-2022)

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Cécilia Cheval, Manon Perez, Louis-Jérôme Leba, Benoît Ranty, Alexandre Perochon, et al.. PRR2, a pseudo-response regulator, promotes salicylic acid and camalexin accumulation during plant immunity. Scientific Reports, 2017, 7 (1), pp.6979. ⟨10.1038/s41598-017-07535-8⟩. ⟨hal-03611666v2⟩
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