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Sucrose Signaling Regulates Anthocyanin Biosynthesis Through a MAPK Cascade in Arabidopsis thaliana
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Sucrose Signaling Regulates Anthocyanin Biosynthesis Through a MAPK Cascade in Arabidopsis thaliana
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Journal Article
Sucrose Signaling Regulates Anthocyanin Biosynthesis Through a MAPK Cascade in Arabidopsis thaliana
2018
Overview
Anthocyanin accumulation specifically depends on sucrose (Suc) signaling. However, the molecular basis of this process remains unknown. In this study, in vitro pull-down assays identified ETHYLENE-INSENSITIVE3 (EIN3), a component of both sugar signaling or/and metabolism. This protein interacted with YDA, and the physiological relevance of this interaction was confirmed by in planta co-immunoprecipitation, yeast two-hybrid (Y2H) assay, and bimolecular fluorescence complementation. Ethylene insensitive3-like 1 (eil1) ein3 double-mutant seedlings, but not ein3-1 seedlings, showed anthocyanin accumulation. Furthermore, ein3-1 suppressed anthocyanin accumulation in yda-1 plants. Thus, EMB71/YDA-EIN3-EIL1 may form a sugar-mediated gene cascade integral to the regulation of anthocyanin accumulation. Moreover, the EMB71/YDA-EIN3-EIL1 gene cascade module directly targeted the promoter of Transparent Testa 8 (TT8) by direct EIN3 binding. Collectively, our data inferred a molecular model where the signaling cascade of the YDA-EIN3-TT8 appeared to target TT8 via EIN3, thereby modulating Suc signaling–mediated anthocyanin accumulation.
Publisher
Genetics Society of America
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