Setosphaeria turcica, an important fungal pathogen, gives rise to a serious threat to corn production. Substantial yield losses of corn are caused by periodic epidemics of this plant disease. Lots of researchers indicate that Ras protein acts as a molecular switch that exists in active (GTP bound) state or inactive (GDP bound) state. It is the important organizer in cAMP, MAPK and Ca2+ signaling pathways. Through these signal transduction pathways, Ras protein can regulate the growth, development and pathog...