TY - JOUR
T1 - Identification and characterization of an ABA-activated MAP kinase cascade in Arabidopsis thaliana
AU - Danquah, Agyemang
AU - Zélicourt, Axel de
AU - Boudsocq, Marie
AU - Neubauer, Jorinde
AU - Frei Dit Frey, Nicolas
AU - Leonhardt, Nathalie
AU - Pateyron, Stéphanie
AU - Gwinner, Frederik
AU - Tamby, Jean Philippe
AU - Ortiz-Masià, Dolores
AU - Marcote, María Jesús
AU - Hirt, Heribert
AU - Colcombet, Jean
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We thank Sean Cutler, Sylvain Merlot and Jane Parker for kindly providing hab1G246D line, pyr1pyl1pyl2pyl4 mutant and pEXCS-GW-mYFP-nls plasmid, respectively. This work was supported by the Institut National de Recherche Agronomique and the Agence Nationale de la Recherche. AD was supported by the Ghanaian Ministry of Education.
PY - 2015/4/8
Y1 - 2015/4/8
N2 - Summary Abscisic acid (ABA) is a major phytohormone involved in important stress-related and developmental plant processes. Recent phosphoproteomic analyses revealed a large set of ABA-triggered phosphoproteins as putative mitogen-activated protein kinase (MAPK) targets, although the evidence for MAPKs involved in ABA signalling is still scarce. Here, we identified and reconstituted in vivo a complete ABA-activated MAPK cascade, composed of the MAP3Ks MAP3K17/18, the MAP2K MKK3 and the four C group MAPKs MPK1/2/7/14. In planta, we show that ABA activation of MPK7 is blocked in mkk3-1 and map3k17mapk3k18 plants. Coherently, both mutants exhibit hypersensitivity to ABA and altered expression of a set of ABA-dependent genes. A genetic analysis further reveals that this MAPK cascade is activated by the PYR/PYL/RCAR-SnRK2-PP2C ABA core signalling module through protein synthesis of the MAP3Ks, unveiling an atypical mechanism for MAPK activation in eukaryotes. Our work provides evidence for a role of an ABA-induced MAPK pathway in plant stress signalling. Significance Statement We report in this article the identification of a complete MAPK module, composed of MAP3K17/18, MKK3 and MPK1/2/7/14, which is activated by ABA through the ABA core signalling complex. We showed that the activation of this module requires the MAP3K protein synthesis which occurs after hours of stress treatment, suggesting that the pathway is involved in a delayed wave of cellular responses to ABA and drought. © 2015 The Authors The Plant Journal © 2015 John Wiley & Sons Ltd.
AB - Summary Abscisic acid (ABA) is a major phytohormone involved in important stress-related and developmental plant processes. Recent phosphoproteomic analyses revealed a large set of ABA-triggered phosphoproteins as putative mitogen-activated protein kinase (MAPK) targets, although the evidence for MAPKs involved in ABA signalling is still scarce. Here, we identified and reconstituted in vivo a complete ABA-activated MAPK cascade, composed of the MAP3Ks MAP3K17/18, the MAP2K MKK3 and the four C group MAPKs MPK1/2/7/14. In planta, we show that ABA activation of MPK7 is blocked in mkk3-1 and map3k17mapk3k18 plants. Coherently, both mutants exhibit hypersensitivity to ABA and altered expression of a set of ABA-dependent genes. A genetic analysis further reveals that this MAPK cascade is activated by the PYR/PYL/RCAR-SnRK2-PP2C ABA core signalling module through protein synthesis of the MAP3Ks, unveiling an atypical mechanism for MAPK activation in eukaryotes. Our work provides evidence for a role of an ABA-induced MAPK pathway in plant stress signalling. Significance Statement We report in this article the identification of a complete MAPK module, composed of MAP3K17/18, MKK3 and MPK1/2/7/14, which is activated by ABA through the ABA core signalling complex. We showed that the activation of this module requires the MAP3K protein synthesis which occurs after hours of stress treatment, suggesting that the pathway is involved in a delayed wave of cellular responses to ABA and drought. © 2015 The Authors The Plant Journal © 2015 John Wiley & Sons Ltd.
UR - http://hdl.handle.net/10754/564127
UR - http://doi.wiley.com/10.1111/tpj.12808
UR - http://www.scopus.com/inward/record.url?scp=84926506739&partnerID=8YFLogxK
U2 - 10.1111/tpj.12808
DO - 10.1111/tpj.12808
M3 - Article
SN - 0960-7412
VL - 82
SP - 232
EP - 244
JO - The Plant Journal
JF - The Plant Journal
IS - 2
ER -