genetics of adult-plant blackleg (Leptosphaeria maculans) resistance from Brassica juncea in B. napus

The genetic control of adult-plant blackleg (Leptosphaeria maculans) resistance in a Brassica napus line (579NO48-109-DG-1589), designated "R13" possessing Brassica juncea-like resistance (JR), was elucidated by the analysis of segregation ratios in F2 and F3 populations from a cross betwe...

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Bibliographic Details
Published inTheoretical and applied genetics Vol. 92; no. 3/4; pp. 382 - 387
Main Authors Pang, E.C.K, Halloran, G.M
Format Journal Article
LanguageEnglish
Published Germany 01.03.1996
Subjects
Brassica juncea
Brassica napus
crossing
cultivars
disease resistance
fungal diseases of plants
genetic resistance
inheritance (genetics)
interspecific hybridization
Leptosphaeria maculans
lines
major genes
nuclear genes
segregation
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Summary:The genetic control of adult-plant blackleg (Leptosphaeria maculans) resistance in a Brassica napus line (579NO48-109-DG-1589), designated "R13" possessing Brassica juncea-like resistance (JR), was elucidated by the analysis of segregation ratios in F2 and F3 populations from a cross between "R13" and the highly blackleg-susceptible B. napus cultivar "Tower". The F2 segregation ratios were bimodal, demonstrating that blackleg resistance in "R13" was controlled by major genes. Analysis of the segregation ratios for 13 F3 families indicated that blackleg resistance in these families was controlled by three nuclear genes, which exhibited a complex interaction. Randomly sampled plants of F3 progeny all had the normal diploid somatic chromosome number for B. napus. The similarities between the action of the three genes found in this study with those controlling blackleg resistance in B. juncea is discussed.
ISSN:0040-5752
1432-2242
DOI:10.1007/BF00223683