Brassica napus DNA markers linked to white rust resistance in Brassica juncea

White rust, caused by Albugo candida, is an economically important disease of Brassica juncea mustard. The most efficient and cost effective way of protecting mustard plants from white rust is through genetic resistance. The development of canola quality B. juncea through interspecific crosses of B....

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Bibliographic Details
Published in:Theoretical and applied genetics 2002-05, Vol.104 (6-7), p.1121-1124
Main Authors: SOMERS, D. J, RAKOW, G, RIMMER, S. R
Format: Article
Language:English
Subjects:
Albugo candida
Biological and medical sciences
Brassica
Brassica juncea
Brassica napus
Canola
Classical genetics, quantitative genetics, hybrids
Condiments
Cultivars
Development and progression
Diseases and pests
DNA
Fundamental and applied biological sciences. Psychology
Genetic aspects
Genetics of eukaryotes. Biological and molecular evolution
Health aspects
Physiological aspects
Plant genetics
Plant immunology
Pteridophyta, spermatophyta
Rape plants
Rust diseases
Seeds
Vegetals
Virulence
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Summary:White rust, caused by Albugo candida, is an economically important disease of Brassica juncea mustard. The most efficient and cost effective way of protecting mustard plants from white rust is through genetic resistance. The development of canola quality B. juncea through interspecific crosses of B. juncea with Brassica napus has lead to the introgression of white rust resistance from B. napus into B. juncea. The objective of this study was to identify DNA markers for white rust resistance, derived from the introgressed B. napus chromosome segment, in a BC(3)F(2) population of condiment B. juncea mustard. This segregating population was phenotyped for white rust reaction and used to screen for AFLP markers associated with white rust resistance using bulked segregant analysis. Segregation data indicated that a single dominant gene controlled resistance to white rust. Eight AFLP markers linked to white rust resistance were identified, all derived from B. napus. The B. napus chromosome segment, carrying the white rust resistance gene ( Ac2V(1)), appeared to have recombined with the B. juncea DNA since recombinant individuals were identified. Comparative mapping of the eight B. napus-derived AFLP markers in a typical B. napus mapping population was inconclusive; therefore, the size of the introgressed B. napus fragment could not be determined.
ISSN:0040-5752
1432-2242
DOI:10.1007/s00122-001-0812-1