Abstract
Small RNAs are involved in a multitude of biological processes in plants. Based on their origins and precursor structures, small RNAs can be divided into two major classes: microRNAs (miRNAs) and small interference RNAs (siRNAs). Small RNAs are typically 21-24 nucleotide (nt) long, and differ in both biogenesis and biological function. In the pathogenic process, pathogens can either induce or suppress the synthesis of small RNAs, which, in turn, regulate the expression of pathogenesis-related genes to mediate diverse plant-pathogen interactions. The biogenesis and biological functions of small RNAs, together with possible regulation mechanisms underlying the host-pathogen interactions, are summarized in this review.
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