MFS-type efflux transporter; part of the gene cluster that mediates the biosynthesis of a tyrosine-derived cytochalasan acting as a fungal signal recognized by resistant rice plants and leads to avirulence in Pi33 resistant rice cultivars (PubMed:18433432). MFS1 might be involved in the excretion of the signaling tyrosine-derived cytochalasan (Probable). Expressed exclusively during fungal penetration of host leaves, the time point at which plant defense reactions are triggered. Belongs to the major facilitator superfamily.