Figures & data
Figure 1 GUS expression in transgenic Arabidopsis seedlings harboring a GUS reporter gene driven by the PAP1 promoter (PAP1pro:GUS rep). Nine day-old seedlings were transferred to 0 (A) and 60 mM (B and C) Suc in the presence of 10 µM DCMU (C) and then exposed to white light (140 µmolm−2s−1) for 48 hours.
Figure 2 Proposed model for redox mediated signaling between cyanic and acyanic cells. (1) Light signals induce exogenous Suc uptake. (2) Apoplastic Suc in cotyledons and leaves is sensed by photosynthetic electron transport in mesophyll cells and generates a plastid signal. (3) The plastid signal is transformed into a mesophyll signal and then (4) transmitted to epidermal or vasculate cells, activating the MBW (Myb-bHLH-WD40) regulatory complex and downregulating MybL2 expression. This in turn leads to the specific upregulation of several late anthocyanin biosynthesis genes (LBGs), resulting in the accumulation of anthocyanin. The signaling molecule that mediates this intercellular response remains elusive.
