Viroids are small single-stranded, circular RNAs that are infectious pathogens. [1][2] Unlike viruses, they have no protein coating. All known viroids are inhabitants of angiosperms (flowering plants), [3] and most cause diseases, whose respective economic importance to …

viroid, an infectious particle smaller than any of the known viruses, an agent of certain plant diseases. The particle consists only of an extremely small circular RNA (ribonucleic acid) molecule, lacking the protein coat of a virus. Viroids appear to be transmitted mechanically from one cell to another through cellular debris.

Viroids are non-coding circular RNA molecules with rod-like or branched structures. They are often ribozymes, characterized by catalytic RNA. They can perform many basic functions of life and may have played a role in evolution since the beginning of life on Earth. They can cleave, join, replicate, and undergo Darwinian evolution.

2024年4月21日 · Viroids consist only of a short strand of circular RNA capable of self-replication. The first viroid discovered was found to cause potato tuber spindle disease, which causes slower sprouting and various deformities in potato plants (see Figure \(\PageIndex{1}\)).

Viroids are single-stranded, covalently closed, circular, highly structured noncoding RNAs that cause disease in several economically important crop plants. They replicate autonomously and move systemically in host plants with the aid of the host machinery.

Viroids are small, single-stranded, circular RNAs that can infect plants and cause specific diseases, even though they do not have the ability to code for proteins. They belong to the taxonomic families of Pospiviroidae and Avsunviroidae, which differ in their structural and functional properties.

2024年11月16日 · Viroids are the smallest known infectious agents, consisting solely of a short strand of circular, single-stranded RNA without a protein coat. They are distinct from viruses due to their simple structure and ability to replicate autonomously within host cells.

2024年6月27日 · Viroids are a group of noncoding subviral RNAs that infect plant hosts. Currently, there are 44 formal viroid species grouped into 2 families, 39 members in Pospiviroidae, and 5 members in Avsunviroidae [1].

2023年9月13日 · Virusoids are circular single-stranded RNAs dependent on plant viruses for replication and encapsidation. The genome of virusoids consists of several hundred nucleotides and only encodes structural proteins. Virusoids are …

Viroids are infectious diseases causing pathogens that affect only plants. They are smaller than Viruses and other pathogens. Explore more about Viroids at BYJU'S.