ORIGINAL PAPER Identification of quantitative trait loci controlling partial clubroot resistance in new mapping populations of Arabidopsis thaliana (original) (raw)

2007

Abstract

To date, mechanisms of partial quantitative resistance, under polygenic control, remain poorly under-stood, studies of the molecular basis of disease resistance have mainly focused on qualitative variation under oligo-genic control. However, oligogenic conferred resistance is rapidly overcome by the pathogen and knowledge of the relationship between qualitative and quantitative resistance is necessary to develop durably resistant cultivars. In this study, we exploited the Arabidopsis thaliana-Plasmodio-phora brassicae pathosystem to decipher the genetic architecture determining partial resistance. This soil-borne pathogen causes clubroot, one of the economically most important diseases of Brassica crops in the world. A quantitative trait locus (QTL) approach was carried out using two segregating populations (F2 and recombinant inbred lines) from crosses between the partially resistant accession Burren and the susceptible accession Columbia. Four additive QTLs (one moderate and three...

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