Non-host disease resistance response in pea (Pisum sativum) pods: Biochemical function of DRR206 and phytoalexin pathway localization

Dirigent protein homolog DRR206 is involved in phytoalexin (lignan) biosynthesis, and the encoding gene is induced upon fungal exposure. MALDI mass spectrometry imaging established that both the monoglucoside derived from (+)-pinoresinol, and the isoflavonoid pisatin, were co-localized in infected endocarp epidermal cells where pathway genes were also detected.