TF and infection: Infection of SNN tobacco by TMV or potato virus Y (PVY) induced the expression of several other genes involved in defense responses, including a mitochondrial alternative oxidase, the transcriptional factor (TF) signaling hub effector 1 (SHE1, previously known as ERF5 [30]), the RNA silencing signal amplifying enzyme RDR6, and IVR [31], as well as TF MYB1 [27,32] and peroxidases [32].