Fig. 7.

Response of key transcripts of the phenylpropanoid pathway to infection with downy mildew. (A–C) Quantification of transcripts of resveratrol synthase (RS), stilbene synthase (StSy), and chalcone synthase (CHS) by quantitative real-time PCR normalized to the expression of elongation factor EF1-α. * and ** indicate differences that are statistically significant at the P <0.05 and P <0.01 level, respectively. Data represent mean values from three independent experimental series; error bars represent standard errors.