The identification of a gene for race-specific resistance to Peronospora parasitica (downy mildew) in Brassica napus var. oleifera (oilseed rape) |
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| Authors: | J. A. LUCAS,I. R. CRUTE ,CHRISTINE SHERRIFF &dagger ,PAMELA L. GORDON |
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| Affiliation: | Institute of Horticultural Research, Wellesbourne, Warwick, CV35 9EF, UK;Department of Botany, University of Nottingham, Nottingham, NG7 2RD, UK |
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| Abstract: | The oilseed rape cultivar Cresor was resistant to 14 isolates of Peronospora parasitica derived from crops of Brassica napus in the UK. Segregation for resistance to one isolate among F2 plants and F3 progeny of crosses between Cresor and the susceptible cultivars Victor and Jet Neuf indicated that resistance was controlled by a single gene. There was evidence that genetic background and environment could influence the phenotypic expression of this resistance. Two sexual progeny isolates derived from a homothallic isolate of P. parasitica avirulent on Cresor were completely virulent on this cultivar. This suggested that the parental isolate was heterozygous at a matching locus or loci for avirulence and demonstrated the race-specific nature of the resistance. |
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