HP and infection: The findings showed that hp‐PtMAPK1RNAi or hp‐PtCYC1RNAi sequences expressed in transgenic wheat plants were processed by the host silencing machinery into siRNA molecules, and these probably are translocated to fungal cells during infection to act upon the target endogenous mRNAs in a nucleotide‐specific manner thereby inhibiting their function in the fungus.