Turnip mosaic virus determinants of virulence for Brassica napus resistance genes

https://doi.org/10.17221/10343-PPSCitation:Jenner C.E., Sánchez F., Tomimura K., Ohshima K., Ponz F., Walsh J.A. (2002): Turnip mosaic virus determinants of virulence for Brassica napus resistance genes. Plant Protect. Sci., 38: S155-S157.
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Dominant resistance genes identified in Brassica napus lines are effective against some, but not all, Turnip mosaic virus
(TuMV) isolates. An infectious clone of an isolate (UK 1) was used as the basis of chimeric virus constructions using
resistance-breaking mutants and other isolates to identify the virulence determinants for three dominant resistance genes.
For the resistance gene TuRB01, the presence of either of two mutations affecting the cylindrical inclusion (CI) protein
converted the avirulent UK 1 to a virulent isolate. Acquisition of such mutations had a slight cost to viral fitness in
plants lacking the resistance gene. A similar strategy is being used to identify the virulence determinants for two more
resistance genes present in another B. napus line.
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