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Título: | The GIGANTEA-ENHANCED em LEVEL Complex Enhances Drought Tolerance via Regulation of Abscisic Acid Synthesis1[OPEN] |
Autor: | Baek, Dongwon; Kim, Woe-Yeon; Cha, Joon-Yung; Park, Hee-Jin; Shin, G.; Park, Junghoon; Lim, Chae Jin; Chung, H.J.; Li, Ning; Kim, D. H.; Lee, Sang Yeol; Pardo, José M. CSIC ORCID ; Kim, M.C.; Yun, Dae-Jin | Palabras clave: | Arabidopsis thaliana Drought stress GIGANTEA (GI) ENHANCED EM LEVEL (EEL) 9-CIS-EPOXYCAROTENOID DIOXYGENASES 3 (NCED3) Abscisic acid (ABA) |
Fecha de publicación: | 2020 | Editor: | American Society of Plant Biologists | Citación: | Plant Physiology 184: 443- 458 (2020) | Resumen: | Drought is one of the most critical environmental stresses limiting plant growth and crop productivity. The synthesis and signaling of abscisic acid (ABA), a key phytohormone in the drought stress response, is under photoperiodic control. GIGANTEA (GI), a key regulator of photoperiod-dependent flowering and the circadian rhythm, is also involved in the signaling pathways for various abiotic stresses. In this study, we isolated ENHANCED EM LEVEL (EEL)/basic Leu zipper 12, a transcription factor involved in ABA signal responses, as a GI interactor in Arabidopsis (Arabidopsis thaliana). The diurnal expression of 9-CIS-EPOXYCAROTENOID DIOXYGENASE 3 (NCED3), a rate-limiting ABA biosynthetic enzyme, was reduced in the eel, gi-1, and eel gi-1 mutants under normal growth conditions. Chromatin immunoprecipitation and electrophoretic mobility shift assays revealed that EEL and GI bind directly to the ABA-responsive element motif in the NCED3 promoter. Furthermore, the eel, gi-1, and eel gi-1 mutants were hypersensitive to drought stress due to uncontrolled water loss. The transcript of NCED3, endogenous ABA levels, and stomatal closure were all reduced in the eel, gi-1, and eel gi-1 mutants under drought stress. Our results suggest that the EEL-GI complex positively regulates diurnal ABA synthesis by affecting the expression of NCED3, and contributes to the drought tolerance of Arabidopsis. | Versión del editor: | http://dx.doi.org/10.1104/PP.20.00779 | URI: | http://hdl.handle.net/10261/228576 | DOI: | 10.1104/PP.20.00779 | Identificadores: | doi: 10.1104/PP.20.00779 issn: 1532-2548 |
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Baek 2020_GI EEL ABA synthesis_Plant Physiology_Author copy.pdf | 4,04 MB | Adobe PDF | Visualizar/Abrir |
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