Fig. 1

Expression pattern of AtFPGS1. a, b Plants transformed with pFPGS1::GUS constructs showing FPGS1 expression in the vascular bundles of cotyledons and hypocotyls (a) and roots (b) of young seedlings. c, d Cross sections of the stained transgenic inflorescence stems showing FPGS1 expression in the fascicular cambium and xylem tissue between protoxylem and metaxylem. e Longitudinal section of pFPGS1::GUS transgenic plants showing FPGS1 expression in the fascicular cambium and xylem region adjacent to metaxylem. f Longitudinal inflorescence stem-sections (100 µm) of plants expressing pFPGS1::FPGS1-GFP were examined for GFP fluorescence. GFP signals were mainly detected in the developing vessel elements adjacent to the differentiated metaxylem. Superimposed image of GFP over a light microscopy image shows the locations of metaxylem and the GFP expressing cells. Arrows highlight the vascular tissue where FPGS1 expression signal is detected in the cytosol. Phloem (PH), protoxylem (PX), metaxylem (MX), developing vessel element (DVE), sclerenchyma fiber (SF), and fascicular cambium (FC). Scale bar 20 µm