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Mitogen-Activated Protein Kinase Kinase 3 Is Required for Regulation during Dark-Light Transition
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 s...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Korean Society for Molecular and Cellular Biology
2015
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4507032/ https://www.ncbi.nlm.nih.gov/pubmed/26082029 http://dx.doi.org/10.14348/molcells.2015.0055 |
Sumario: | 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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