Development and characterisation of Brassica napus-sinapis arvensis addition lines exhibiting resistance to Leptosphaeria maculans

Blackleg caused by Leptosphaeria maculans is one of the most important diseases affecting oilseed rape worldwide. Sinapis arvensis is valuable for the transfer of blackleg resistance to oilseed rape (Brassica napus) because this species contains high resistance against various aggressive isolates of...

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Bibliographic Details
Published in:Theoretical and applied genetics 2000-11, Vol.101 (7), p.1008-1014
Main Authors: SNOWDON, R. J, WINTER, H, DIESTEL, A, SACRISTAN, M. D
Format: Article
Language:English
Subjects:
Biological and medical sciences
blackleg
Brassica napus
Chromosomes
Classical genetics, quantitative genetics, hybrids
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
Genomes
Leptosphaeria maculans
Oilseeds
Pathogens
Plant resistance
Pteridophyta, spermatophyta
Rape plants
Sinapis arvensis
Vegetals
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Summary:Blackleg caused by Leptosphaeria maculans is one of the most important diseases affecting oilseed rape worldwide. Sinapis arvensis is valuable for the transfer of blackleg resistance to oilseed rape (Brassica napus) because this species contains high resistance against various aggressive isolates of the blackleg fungus. These include at least one Australian isolate which has been found to overcome resistance originating from species with the Brassica B genome, until now the major source for interspecific transfer of blackleg resistance. Backcross offspring from intergeneric crosses between Brassica napus and S. arvensis were subjected to phytopathological studies and molecular cytogenetic analysis with genomic in situ hybridisation (GISH). The BC^sub 3^S progenies included fertile plants exhibiting high seedling (cotyledon) and adult plant resistance associated with the presence of an acrocentric addition chromosome from S. arvensis. In addition, some individuals with adult plant resistance but cotyledon susceptibility were observed to have a normal B. napus karyotype with no visible GISH signals, indicating possible resistant introgression lines. Phytopathological analysis of selfing progenies from 3 different highly resistant BC^sub 3^ plants showed that seedling and adult plant resistance are probably conferred by different loci.[PUBLICATION ABSTRACT]
ISSN:0040-5752
1432-2242
DOI:10.1007/s001220051574