Small, low-molecular weight ribonucleic acid that can infect plant cells, replicate themselves, and cause disease.

any of several casative agents of plant diesase that consist solely of a single-stranded RNA of low molecular weight arranged in a closed loop or a linear chain.

Infective forms of nucleic acid without a protective coat of protein; unencapsulated single-stranded RNA molecules. Naked RNA, possibly of degenerated virus, that infects plants.