DSC2 and infection: Although expression of NB-LRR R genes has only seldom found to be responsive to pathogen infection [49], [50], transcription of Nbs2-Rdg2 was enhanced up to three fold by 14 days after inoculation by P. graminea-Dg2 (Figure 2D), a time point when several defence-related genes are transcriptionally up-regulated in the Rdg2a-genotype [5].