Figure 1

Boxplots showing relative expression ratios. Boxplots showing relative expression ratios (log₂ transformed) of genes VvvInv2, VvAcyt, VvAgpL, VvHP, VvEtr, VvF3h, VvLox, VvOlp, VvSamt, VvWrky, VvAdh1, VvSuSy, VvCaSy, VvCko, VvGlc1, VvGlc2 and VvGlc3 normalized using 18S/Cox (geometric mean of 18S and Cox Ct values) in healthy and phytoplasma-infected cv. 'Chardonnay' samples (leaf veins) collected in the first growing season (A) and in the second growing season (B). Threshold for statistical significance between relative expression ratios of healthy and infected samples is P < 0·05 (Welch two sample t-test). Boxplots for genes where such differences were observed are represented with dark gray colors in contrast to white boxplots for non-significant genes.