Avirulence gene. A subset of genes in a pathogen encoding effector proteins: A gene the presence of which results in incompatibility when the host possesses the corresponding resistance (R) gene (according to the gene-for-gene hypothesis). An Avr gene can thus encode a specific elicitor. The recessive allele is written avr, though vir is also used in epidemiological literature.
Adapted from: Tronsmo, A.M., Collinge, D.B., Djurle, A., Munk, L., Yuen, J. and. Tronsmo, A. 2020 Plant pathology and plant diseases. CABI, Wallingford.
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