This project aims to understand better the stress response mechanisms of components of the well known High Osmolarity Glycerol two-component regulatory system in the model organism Magnaporthe oryzae. Currently, two putative isoforms of the transfer protein YPD1 (MGG_07173) are described as theoretical proteins in the UniProt database (G4MTL0 and G4MTK9). For better understanding of signal transduction and response triggering we aimed to identify alternative isoforms that might explain the variety of triggered responses throughout the YPD1 signal transfer hub.