Molecular cytogenetic identification of B genome chromosomes linked to blackleg disease resistance in Brassica napus × B. carinata interspecific hybrids.
Theor Appl Genet
; 127(6): 1305-18, 2014 Jun.
Article
en En
| MEDLINE
| ID: mdl-24687759
KEY MESSAGE: Provide evidence that the Brassica B genome chromosome B3 carries blackleg resistance gene, and also the B genome chromosomes were inherited several generations along with B. napus chromosomes. Blackleg disease caused by fungus Leptosphaeria maculans causes significant yield losses in Brassica napus. Brassica carinata possesses excellent resistance to this disease. To introgress blackleg resistance, crosses between B. napus cv. Westar and B. carinata were done. The interspecific-hybrids were backcrossed twice to Westar and self-pollinated three times to produce BC2S3 families. Doubled haploid lines (DH1) were produced from one blackleg resistant family. SSR markers were used to study the association between B genome chromosome(s) and blackleg resistance. The entire B3 chromosome of B. carinata was associated with blackleg resistance in DH1. A second DH population (DH2) was produced from F1s of resistant DH1 lines crossed to blackleg susceptible B. napus cv. Polo where resistance was found to be associated with SSR markers from the middle to bottom of the B3 and top of the B8 chromosomes. The results demonstrated that the B3 chromosome carried gene(s) for blackleg resistance. Genomic in situ hybridization (GISH) and GISH-like analysis of the DH2 lines revealed that susceptible lines, in addition to B. napus chromosomes, possessed one pair of B genome chromosomes (2n = 40), while resistant lines had either one (2n = 40) or two pairs (2n = 42) of B chromosomes. The molecular and GISH data suggested that the B chromosome in the susceptible lines was B7, while it was difficult to confirm the identity of the B chromosomes in the resistant lines. Also, B chromosomes were found to be inherited over several generations along with B. napus chromosomes.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Enfermedades de las Plantas
/
Brassica
/
Genoma de Planta
/
Cromosomas de las Plantas
/
Resistencia a la Enfermedad
/
Hibridación Genética
Tipo de estudio:
Diagnostic_studies
Idioma:
En
Revista:
Theor Appl Genet
Año:
2014
Tipo del documento:
Article
País de afiliación:
Canadá
Pais de publicación:
Alemania