Identification of two blackleg resistance genes and fine mapping of one of these two genes in a Brassica napus canola cultivar 'Surpass 400'.
Theor Appl Genet
; 122(6): 1223-31, 2011 Apr.
Article
em En
| MEDLINE
| ID: mdl-21258998
ABSTRACT
Blackleg resistant cultivars have been developed through conventional breeding methods and are successfully used globally to control this disease in canola production. To clone blackleg resistance genes and to understand the mechanism underlying the resistance, a blackleg resistant canola cultivar 'Surpass 400' was used to develop a gene mapping population. A previously reported high density genetic map was used to find a resistance gene region that corresponded to linkage group N10 in B. napus. Differential interactions between the resistant lines and a pathogen isolate were discovered with two resistance genes BLMR1 and BLMR2 identified through linkage analysis of five genome-specific molecular markers. BLMR1 provides resistance through the hypersensitive response that protects inoculated cotyledons from becoming infected, Unlike BLMR1, BLMR2 slows down the development of individual infection loci. BLMR1 and BLMR2 segregated independently in two large F(3)BC(2) populations. Fine mapping of BLMR1 was performed with 12 genome-specific molecular markers. The closest marker with a genetic distance of 0.13 cM to BLMR1 was identified, which lays a solid foundation for cloning BLMR1.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Ascomicetos
/
Mapeamento Cromossômico
/
Brassica napus
/
Imunidade Inata
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
Theor Appl Genet
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Canadá