viroid

Noun

Meaning

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.

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Examples

In 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

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