Sucrose Induction of Anthocyanin Biosynthesis Is Mediated by DELLA

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Sucrose Induction of Anthocyanin Biosynthesis Is Mediated by DELLA Yi Li, Wim Van den Ende, Filip Rolland Molecular Plant Volume 7, Issue 3, Pages 570-572 (March 2014) DOI: 10.1093/mp/sst161 Copyright © 2014 The Authors. All rights reserved. Terms and Conditions

Figure 1 Sucrose Signaling Mediated by DELLA Protein Stabilization. (A) Anthocyanin accumulation and growth defect phenotype in Ler wild-type and quadruple gai-t6 rga-t2 rgl1-1 rgl2-1 (della) mutant seedlings treated with 200mM mannitol (wild-type control) or sucrose (Suc). (B) The expression of anthocyanin biosynthesis-related genes in Ler wild-type and della mutant seedlings treated with 100mM Suc. MYB75 (At1g56650), CHS (At5g13930), DFR (At5g42800). (C) Skotomorphogenic hypocotyl growth with increasing Suc concentrations (0mM, 100mM, and 200mM) in Ler wild-type and della mutants. (D) RGA protein stability after addition of 10 μM gibberellin (GA4) in the presence of 100mM mannitol (Mtl) or sucrose (Suc). The quadruple della mutant serves as a negative control and paclobutrazol (PAC) treatment as a positive control. Ponceau staining and aspecific bands (*) serve as equal loading controls. (E) RGA protein stability after addition of 10 μM gibberellin (GA4) in the presence of 100mM mannitol (Mtl), glucose (Glc), and sucrose (Suc). (F) Anthocyanin accumulation and growth defect in Ler wild-type and gain-of-function gai (stabilized GAI) mutants in the absence of Suc supplementation. (G) Basal MYB75, anthocyanin biosynthesis-related and DFR (dihydro-ﬂavonol reductase, At5g42800) target gene, and GA3OX1 (GA3 oxidase1, At1g15550) and GA20OX1 (GA20 oxidase1, At4g25420) DELLA target gene expression in Ler wild-type and gai mutants in the absence of Suc supplementation. (H) Summarizing figure. Sucrose blocks GA-mediated degradation of DELLA proteins, inhibiting growth and activating MYB75 gene expression and anthocyanin biosynthesis. Molecular Plant 2014 7, 570-572DOI: (10.1093/mp/sst161) Copyright © 2014 The Authors. All rights reserved. Terms and Conditions