viroid


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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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]
Farlex Partner Medical Dictionary © Farlex 2012

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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

vi·roid

(vī'royd)
A viruslike agent of plant diseases containing RNA but no protein.
[virus + G. eidos, resemblance]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

viroid

a virus-like pathogenic structure consisting of an RNA molecule, but with no protein coat.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
The archaea and viroids can regulate the nervous system including the NMDA/GABA thalamocorticothalamic pathway mediating conscious perception.
Research that links specific pieces of RNA to an infectious organism's duplication and spread could lead the way to the prevention of viroids, pathogens that can kill or damage food crops and other plants.
The viroid nature of the cadang-cadang disease of coconut.
Coconut cadang-cadang disease and its viroid agent.
Diener discovers the viroid, the smallest known agent of plant disease.
Vidhyasekaran (Tamil Nadu Agricultural University) describes 35 molecular diagnostic techniques for diagnosing fungal, bacterial, viral, phytoplasma, and viroid diseases, the various molecular marker- assisted breeding technologies, and transgenic plants with diseases- resistant genes.
Studies on the diagnosis of hop stunt viroid in fruit trees: Identification of new host and application of a nucleic acid extraction procedure based on nonorganic solvents.
In the first volume, Studies in Viral Ecology: Microbial and Botanical Host Systems, the 12 chapters define viral ecology and the basic biology of viruses, viral taxonomy, and morphology, replication, assembly, and evolutionary ecology, then viruses with microbial and plant hosting species, including bacteriophage and viral ecology as viewed through nucleic acid sequence data; viruses of cyanobacteria, eukaryotic algae, and seaweeds; the ecology and evolution of fungal, prion, and plant viruses, including geminiviruses; and viroids and viroid diseases of plants.
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.