Different classes of resistance to turnip mosaic virus in Brassica rapa

Pathotype-specific and broad-spectrum resistance to turnip mosaic virus (TuMV) have been identified in the diploid A genome brassica species Brassica rapa. The pathotype-specific resistance is effective against pathotype 1 isolates of TuMV, which are the most common in Europe. It is almost identical...

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Bibliographic Details
Published in:European journal of plant pathology 2002, Vol.108 (1), p.15-20
Main Authors: WALSH, John A, RUSHOLME, Rachel L, HUGHES, Sara L, JENNER, Carol E, BAMBRIDGE, Judith M, LYDIATE, Derek J, GREEN, Sylvia K
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Brassica rapa
Fundamental and applied biological sciences. Psychology
Genes
Genetics
Genetics and breeding of economic plants
Pest resistance
Phytopathology. Animal pests. Plant and forest protection
Plant pathogens
Plant viruses and viroids
TuRB01 gene
Turnip mosaic virus
Varietal selection. Specialized plant breeding, plant breeding aims
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Summary:Pathotype-specific and broad-spectrum resistance to turnip mosaic virus (TuMV) have been identified in the diploid A genome brassica species Brassica rapa. The pathotype-specific resistance is effective against pathotype 1 isolates of TuMV, which are the most common in Europe. It is almost identical in its specificity to that of a mapped resistance gene (TuRB01) present in the A genome of the amphidiploid species Brassica napus. A mutant of a pathotype 1 isolate of TuMV (UK 1M) that is able to overcome TuRB01 also overcame the B. rapa resistance. This, combined with the fact that a single-nucleotide mutation in the cylindrical inclusion gene of TuMV that has been shown to induce a change from avirulence to virulence against TuRB01, had an identical effect on the B. rapa resistance, suggest that the two resistances are conditioned by the same gene. A second source of resistance in B. rapa prevented systemic spread of all TuMV isolates tested. A third source of resistance that appears to provide immunity to, or severely restrict replication of most isolates of TuMV has been characterised. This resistance source also prevented systemic spread of all TuMV isolates tested. Prior to this study, no resistance to pathotype 4 or pathotype 12 isolates of TuMV had ever been identified. For each of these three resistance sources, plant lines that are not segregating for some of the resistance phenotypes and that are presumably homozygous for the genes controlling these phenotypes have been generated. Strategies for further characterising and deploying these resistances in different Brassica species are described.[PUBLICATION ABSTRACT]
ISSN:0929-1873
1573-8469
DOI:10.1023/A:1013962911906