S100A6 and infection: These findings were supported by higher expression levels of several sesquiterpene synthases (MA_10434494g0010; MA_10435334g0020) in all susceptible genotypes in comparison to PRA-R since the very beginning of the infection process, and by the induced over-expression of a farnesyl diphosphate synthase (MA_175884g001), which was observed only in susceptible genotypes at 38 dpi (Additional file 18: Figure S8).