The molecular basis of CONSTITUTIVE PHOTOMORPHOGENIC1 action during photomorphogenesis
Hua Zhou1, Xing Wang Deng1,2,3
1Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes, Department of Biology, Institute of Plant and Food Sciences, School of Life Sciences, Southern University of Science and Technology, Shenzhen 518055, China.
Abstract:
CONSTITUTIVE PHOTOMORPHOGENIC1 (COP1), a repressor of seedling photomorphogenesis, is tightly controlled by light. In Arabidopsis, COP1 primarily acts as a part of large E3 ligase complexes and targets key light-signaling factors for ubiquitination and degradation. Upon light perception, the action of COP1 is precisely modulated by active photoreceptors. During seedling development, light plays a predominant role in modulating seedling morphogenesis, including inhibition of hypocotyl elongation, cotyledon opening and expansion, and chloroplast development. These visible morphological changes evidently result from networks of molecular action. In this review, we summarize current knowledge about the molecular role of COP1 in mediating light-controlled seedling development.
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