viroid


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

viroid

 [vi´roid]
any of a class of infectious agents consisting of a small strand of RNA not associated with any protein. The RNA does not code for proteins and is not translated; it is replicated by host cell enzymes. Viroids are known to cause several plant diseases.

vi·roid

(vī'royd),
An infectious pathogen of plants that is smaller than a virus (MW 75,000-100,000) and differs from one in that it consists only of single-stranded closed circular RNA, lacking a protein covering (capsid); replication does not depend on a helper virus, but is mediated by host cell enzymes.
[virus + G. eidos, resemblance]

viroid

(vī′roid′)
n.
An infectious particle, similar to but smaller than a virus, that consists solely of a strand of RNA and is capable of causing disease in plants.

viroid

[vī′roid]
a small infective segment of nucleic acid, usually ribonucleic acid (RNA). It is not translated and is replicated by host cell enzymes. Viroids include segments that are complementary to introns and may bind to intron RNA. Viroids are responsible for several plant diseases. Although they have not been associated with animal diseases, viroid-like DNA has been found in cancer cells, and some authorities believe that viroids can evolve into infectious animal viruses. See also intron, plasmid, transposon.

vi·roid

(vī'royd)
A viruslike agent of plant diseases containing RNA but no protein.
[virus + G. eidos, resemblance]

viroid

a virus-like pathogenic structure consisting of an RNA molecule, but with no protein coat.

viroid

the smallest known infectious agent consisting of a small circular RNA molecule of only 300 to 400 nucleotides that replicates entirely by means of host enzymes since the viroid RNA codes for nothing. It causes a number of important diseases in plants but has not been identified in animals.
References in periodicals archive ?
That helped us decide to look at all of the loops of a viroid RNA and see how each one functions," Ding explains.
Actinides like rutile as well as organisms like phytoplasmas and viroids have been implicated in the etiology of EMF [1,2,3,4].
However, she adds, at least on e group 1 intron shares yet other viroid sequences, stretches of RNA responsible for modulating the severity of infection.
A shipment of Maine seed potatoes was prohibited from being planted in New Brunswick, Canada, because it was believed to be infected with potato spindle tuber viroid.
This helps to modulate the archaea and viroid induced chronic immune activation.
Avocado sunblotch viroid (ASBVd) is persistent in nucellar cultures (Persea americana Mill.
A single viroid was found to cause more than a dozen different plant diseases.
Like a virus, a viroid invades cells and hijacks their reproductive mechanism.
In 1971, ARS researchers determined that a viroid was the cause of potato spindle tuber disease, which previously had been identified as a virus.
The archaea and viroid generated cytokines can lead to TNF alpha induced insulin resistance and metabolic syndrome x.
to accomplish what conventional breeding has not: produce crop plants that withstand viroid diseases; and