viroid


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viroid,

microscopic infectious agent, much smaller than a virusvirus,
parasite with a noncellular structure composed mainly of nucleic acid within a protein coat. Most viruses are too small (100–2,000 Angstrom units) to be seen with the light microscope and thus must be studied by electron microscopes.
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, that infects higher plants such as potatoes, tomatoes, chrysanthemums, and cucumbers, causing stunted or distorted growth and sometimes death. It can be transmitted by pollen, seed, or farm implements. Viroids are single strands of RNA and lack the protein coat of viruses. They do not code for any specific protein but are able to replicate themselves in the nuclei of infected cells. Some scientists believe viroids are parts of normal RNA that have gone awry. Potato spindle tuber viroid was the first to be identified.

viroid

[′vī‚rȯid]
(microbiology)
The smallest known agents of infectious disease, characterized by the absence of encapsidated proteins.
References in periodicals archive ?
The RNA viroid induced mRNA interference can modulate dopaminergic, glutamatergic and serotoninergic synaptic transmission contributing to the pathogenesis of schizophrenia, autism and primary seizure disorder.
The archaea and viroids can regulate the nervous system including the NMDA/GABA thalamocorticothalamic pathway mediating conscious perception.
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.
Potato spindle viroid is not a quarantine issue for the United States, so APHIS wasn't involved.
But it took 6 painstaking years for him to amass the evidence to prove that the viroid life form exists.
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
The actinidic archaeal and viroid induced Warburg phenotype contributes to the pathology of the disease states mentioned.