Characterisation of resistance to turnip mosaic virus in oilseed rape (Brassica napus) and genetic mapping of TuRB01 |
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Authors: | J A Walsh A G Sharpe C E Jenner D J Lydiate |
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Institution: | (1) Horticulture Research International, Wellesbourne,Warwick, CV35 9EF, UK e-mail: john.walsh@hri.ac.uk Fax: +44-1789-470552, GB;(2) Molecular Genetics Section, Agriculture and Agri-Food Canada Saskatoon Research Centre, 107 Science Place, Saskatoon, Saskatchewan, S7N 0X2, Canada, CA |
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Abstract: | Turnip mosaic virus (TuMV) is the major virus infecting Brassica crops. A dominant gene, TuRB01, that confers extreme resistance to some isolates of TuMV on Brassica napus (oilseed rape), has been mapped genetically. The mapping employed a set of doubled-haploid lines extracted from a population
used previously to develop a reference RFLP map of the B. napus genome. The positioning of TuRB01 on linkage group N6 of the B. napus A–genome indicated that the gene probably originated from Brassica rapa. Resistance phenotypes were confirmed by indirect plate-trapped antigen ELISA using a monoclonal antibody raised against
TuMV. The specificity of TuRB01 was determined using a wide range of TuMV isolates, including representatives of the European and American/Taiwanese pathotyping
systems. Some isolates of TuMV that did not normally infect B. napus plants possessing TuRB01 produced mutant viruses able to overcome the action of the resistance gene. TuRB01 is the first gene for host resistance to TuMV to be mapped in a Brassica crop. A second locus, TuRB02, that appeared to control the degree of susceptibility to the TuMV isolate CHN 1 in a quantitative manner, was identified
on the C-genome linkage group N14. The mapping of other complementary genes and the selective combining of such genes, using
marker-assisted breeding, will make durable resistance to TuMV a realisable breeding objective.
Received: 14 December 1998 / Accepted: 10 April 1999 |
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Keywords: | Brassica TuMV Resistance Genetic mapping Mutation Plant breeding |
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