Macroarray analysis of VvSUC /VvSUT (A), VvHT (B), VvTMT (C) and VvPMT (D) genes expression in grapevine vegetative organs. RNA was isolated from vegetative organs collected from 20 independent plants. Gene transcript levels were normalized against four reference genes (GAPDH, EF1α, EF1γ, actin). Each value represents the mean of six replicates obtained with two independent experiments. Red point indicates an expression value higher than the mean of the expression value for all genes in the tested organ (mean value of relative expression for young leaf: 0.03; mature leaf: 0.05; petiole: 0.07; stem: 0.05; root: 0.05; tendril: 0.07).