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 (ā-vîr′yə-lənt, ā-vîr′ə-)
Not virulent.

a·vir′u·lence n.


(Microbiology) (esp of bacteria) not virulent


(eɪˈvɪr yə lənt, eɪˈvɪr ə-)

(of microorganisms) having lost virulence; no longer pathogenic.
a•vir′u•lence, n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.avirulent - not virulent; unable to produce disease
virulent - infectious; having the ability to cause disease
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References in periodicals archive ?
Continuously, mining novel resistance and avirulence genes for better understanding the interaction mechanisms, and using molecular markers to analyze the genetic structure of pathogen populations, the structure and function of genes need to be clear and may provide information for reasonably utilizing resistance genes (Hasan et al.
Recognition process includes product of a dominant resistance R gene present in the plant and the corresponding dominant avirulence (Avr) factor encoded by or derived from the pathogen.
The RAPD and amplified fragment length polymorphism (AFLP) markers linked to avirulence loci in P.
Mutations affecting the UL21 gene contribute to avirulence of pseudorabies virus vaccine strain Bartha.
Plants have evolved strategies to oppose attack by pathogens, and consequently, plant genomes encode resistance proteins (R proteins) that allow them to recognize specific pathogen-derived molecules known as avirulence (avr) factors (KIRALY et al.
A genetic map of the lettuce downy mildew pathogen, Bremia lactucae, constructed from molecular markers and avirulence genes.
oryzae raxP and raxQ genes encode an ATP sulphurylase and adenosine-5'-phosphosulphate kinase that are required for AvrXa21 avirulence activity.
Plants expressing a resistance (R) gene rapidly initiate defense responses following contact with a pathogen that expresses a corresponding avirulence (avr) gene (Flor, 1971).
Genomic analysis of a 1 Mb region near the telomere of Hessian fly chromosome X2 and avirulence gene vH13.
Magnaporthe oryzae isolates causing gray leaf spot of perennial ryegrass possess a functional copy of the AVR1-CO39 avirulence gene.