Journal
THEORETICAL AND APPLIED GENETICS
Volume 101, Issue 5-6, Pages 885-891Publisher
SPRINGER
DOI: 10.1007/s001220051557
Keywords
Brassica napus; epistasis; molecular markers; Plasmodiophora brassicae; quantitative trait loci (QTL)
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Clubroot, caused by Plasmodiophora brassicae, is a damaging disease of Brassica napus. Genetic control and mapping of loci involved in high and partial quantitative resistance expressed against two single spore isolates (Pb137-522 and K92-16) were studied in the F-1, and DH progenies of the cross Darmor-bzh (resistant) x Yudal (susceptible). The high level of resistance expressed by Darmor-bzh to isolate Pb137-522 was found to be mainly due to a major gene, which we have named Pb-Bn1, located on linkage group (LG) DY4. Partial quantitative resistance showed by Darmor-bzh to the K92-16 isolate arose from the association of at least two additive QTLs detected on LGs DY4 and DY15; the QTL on DY4, explaining 19% of the variance, was mapped at the same position as the major gene Pb-Bn1. Epistatic interactions between nine regions with or without additive effects were detected. The total phenotypic variation accounted for by additive and epistatic QTLs ranged from 62% to 81% depending on the isolate. For one isolate, the relative effect due to additivity was similar to that due to epistasis.
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