Noun
A short section of RNA but without the protein coat typical of viruses, that are plant pathogens
Certain defective viruses, such as hepatitis D, a human pathogen.
Source: en.wiktionary.orgIn 1976, Sänger et al. citation presented evidence that potato spindle tuber viroid is a "single-stranded, covalently closed, circular RNA molecule, existing as a highly base-paired rod-like structure"—believed to be the first such molecule described. Source: Internet
Leaf contact transmits the viroid. Source: Internet
Secondly, siRNAs corresponding to sequences from viroid genomes have been isolated from infected plants. Source: Internet
The viroid enters the cell via its plasmodesmata. Source: Internet