A novel miP regulates flowering time. A, Scheme of FWA and SPPR interacting through the Leu zipper domain. HD-SAD, HD-START-associated domain. The N-terminal region of FWA and SPPR lies at the bottom of the protein schemes. B, Number of days to bolting of wild-type (WT), 35S:SPPR, fwa-1, and eight independent fwa-1;35S:SPPR plants. Error bars indicate 95% confidence interval. Asterisks indicate fwa-1;35S:SPPR transgenic lines that are statistically different from fwa-1 (P < 0.05, Student’s t test). C, Model for SPPR molecular function. D, Arabidopsis seeds at globular embryo stage expressing GFP with the FWA promoter (pFWA:GFP) or GUS as a translational fusion to the SPPR promoter and genomic region (pSPPR:SPPR:GUS). Arrows indicate embryos. Bars = 20 μm.