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Fusarium head blight (FHB) and sharp eyespot are important diseases of the cereal plants, including bread wheat ( Triticum aestivum ) and barley. Both diseases are predominately caused by the pathogenic fungi,  Fusarium graminearum  and  Rhizoctonia cerealis . The roles of the wheat-wall-associated kinases (WAKs) in defense against both  F. graminearum  and  R. cerealis  have remained largely unknown. This research reports the identification of  TaWAK2A-800 , a wheat  WAK -coding gene located on chromosome 2A, and its functional roles in wheat resistance responses to FHB and sharp eyespot.  TaWAK2A-800  transcript abundance was elevated by the early infection of  R. cerealis  and  F. graminearum , or treatment with exogenous chitin. The gene transcript seemed to correspond to the resistance of wheat. Further functional analyses showed that silencing  TaWAK2A-800  compromised the resistance of wheat to both FHB ( F. graminearum ) and sharp eyespot ( R. cerealis ). Moreover, the silencing reduced the expression levels of six defense-related genes, including the chitin-triggering immune pathway-marker genes,  TaCERK1 ,  TaRLCK1B , and  TaMPK3 . Summarily,  TaWAK2A-800  participates positively in the resistance responses to both  F. graminearum  and  R. cerealis , possibly through a chitin-induced pathway in wheat.  TaWAK2A-800  will be useful for breeding wheat varieties with resistance to both FHB and sharp eyespot.

TaWAK2A-800, a Wall-Associated Kinase, Participates Positively in Resistance to Fusarium Head Blight and Sharp Eyespot in Wheat