Quantitative RT-PCR assay for the transcription levels of four cell death suppressor-related proteins in the compatible and incompatible interactions of wheat- P. striiformis f. sp. tritici. RNA derived from wheat-P. striiformis f. sp. tritici. compatible (wheat cultivar Suwon 11 inoculated with CYR31) and incompatible (wheat cultivar Suwon 11 inoculated with CYR23) interactions was extracted from infected wheat leaves harvested at 0, 24, 48, 72 and 120 hpi. The Y ax shows relative expressions as folds of the mean expression level of the mock treatment. The mock values for compatible and incompatible interactions are mean values for all time-points as there was no significant difference among the different time points.