RNA interference(RNAi)is a conserved mechanism that regulates gene expression in eukaryotes.Within the domains of plants and microbes,this mechanism not only governs intracellular gene expression but also transcends species boundaries,mediating gene silencing across distinct biological kingdoms.This phenomenon,termed Cross-kingdom RNAi(ckRNAi),enables RNAi signals to operate bidirectionally between organisms from different taxonomic groups.Notably,ckRNAi is widely observed in plant-fungal systems,where it reciprocally regulates growth and behaviors of both interacting partners.This review summarizes recent advances in ckRNAi research within plant-microbe interactions and explores its application scenarios,aiming to provide reference for developing ckRNAi-based technologies or products to combat plant diseases.
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