Mitogen-Activated Protein Kinase Kinase 3 Is Required for Regulation during Dark-Light Transition |
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Authors: | Horim Lee |
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Affiliation: | Department of Pre-PharmMed, College of Natural Sciences, Duksung Women’s University, Seoul 132-714, Korea |
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Abstract: | Plant growth and development are coordinately orchestrated by environmental cues and phytohormones. Light acts as a key environmental factor for fundamental plant growth and physiology through photosensory phytochromes and underlying molecular mechanisms. Although phytochromes are known to possess serine/threonine protein kinase activities, whether they trigger a signal transduction pathway via an intracellular protein kinase network remains unknown. In analyses of mitogen-activated protein kinase kinase (MAPKK, also called MKK) mutants, the mkk3 mutant has shown both a hypersensitive response in plant hormone gibberellin (GA) and a less sensitive response in red light signaling. Surprisingly, light-induced MAPK activation in wild-type (WT) seedlings and constitutive MAPK phosphorylation in dark-grown mkk3 mutant seedlings have also been found, respectively. Therefore, this study suggests that MKK3 acts in negative regulation in darkness and in light-induced MAPK activation during dark-light transition. |
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Keywords: | Arabidopsis gibberellin light MAP kinase kinase MAPK cascade |
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