NDLI: Acquisition of Multiple Virulence/Avirulence Determinants by Potato Virus X (PVX) has Occurred Through Convergent Evolution Rather than Through Recombination

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Acquisition of Multiple Virulence/Avirulence Determinants by Potato Virus X (PVX) has Occurred Through Convergent Evolution Rather than Through Recombination

Content Provider	Springer Nature Link
Author	Malcuit, Isabelle de Jong, Walter Baulcombe, David C. Shields, Denis C. Kavanagh, Tony A.
Copyright Year	2000
Abstract	Resistance to potato virus X (PVX) is determined by the product of a host resistance gene and a viral determinant specifying either virulence (resistance-breaking ability) or avirulence (resistance sensitivity). The viral coat protein is the determinant of resistance mediated by the host Nx gene while the 25 kDa movement protein is the determinant of Nb-mediated resistance. Group 1 and group 4 strains of PVX are avirulent or virulent respectively for both these determinants while group 2 and group 3 strains are virulent for one but avirulent for the other determinant. There are two alternative evolutionary mechanisms by which the various strain groups might have evolved: either by recombination between strains carrying virulence (or avirulence) determinants that evolved once only, or alternatively, by independent evolution of at least one virulence (or avirulence) determinant in distinct phylogenetic branches. These alternative hypotheses were investigated by (i) determining the complete genomic sequence of a group 1 and a group 4 strain and (ii) comparing the completely sequenced genomes of six isolates representative of the four strain groups. The analysis revealed the same phylogeny for all five PVX genes. Thus, there is no evidence that the PVX strain groups evolved by recombination.
Starting Page	165
Ending Page	172
Page Count	8
File Format	PDF
ISSN	09208569
Journal	Virus Genes
Volume Number	20
Issue Number	2
e-ISSN	1572994X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Medical Microbiology Virology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Virology Genetics Medicine Molecular Biology

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