Viroids are the smallest known plant pathogens, comprising single-stranded, circular RNAs of a few hundred nucleotides and lacking any protein-coding capacity. They are classified into two families ...
Viroid replication generates dsRNA intermediates, which are processed by Dicer into 21- to 25-nucleotide siRNAs. These siRNAs are then incorporated into siRNA – ribonuclease complexes (RISC). If the ...