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
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The archaea and viroids can regulate the nervous system including the NMDA/GABA thalamocorticothalamic pathway mediating conscious perception.
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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.
Studies in viral ecology; 2v
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Prions do not contain DNA or RNA as do fungi, bacteria, viruses, viroids, or any other previously known infectious entities.
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A list of proposed standard acronyms for plant viruses and viroids. Arch Virol 1991:120:151-64.
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In my opinion, concerns about latent viruses, viroids, graft incompatibility, rootstock adaptability, and plant material quality have been masking the presence of black goo disease for some years.
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Sweet lime is also grown in different parts of Oman, with Samael district being of great importance in sweet lime production.Despite heavy reliance on citrus in Oman, especially acid lime, citrus species suffer from a number of disease problems, which include witches' broom disease of lime, Citrus tristeza virus, citrus gummosis and citrus viroids (Moghal et al., 1993; Al-Sadi et al., 2012a, b; Al-Harthi et al., 2013).
Characterization and Pathogenicity of Fungal Pathogens Associated with Root Diseases of Citrus in Oman

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