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. 2020 Jul 3;11:899. doi: 10.3389/fpls.2020.00899

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Copyright © 2020 Fredua-Agyeman, Jiang, Hwang and Strelkov.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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QTL likelihood profile partial linkage map of the A03 chromosome of B. napus and B. rapa showing resistance to two P. brassicae pathotypes 5X (A) and 5G (B) in Popl#2. Pathotypes 5X and 5G used in the inoculation experiments could overcome clubroot resistance in commercial canola cultivars (Strelkov et al., 2016, 2018). The LOD scores are indicated on the y-axis while the marker names and the genetic distances (in cM) are indicated on the x-axis. Only one QTL (BraA3P5X.CRa/b^Kato1.2 and BraA3P5G.CRa/b^Kato1.2) was detected for resistance to pathotypes 5X (A) and 5G (B). This QTL was detected in genomic regions of the A03 chromosome of B. napus and B. rapa where the CRa/CRb^Kato gene(s) was reported (Matsumoto et al., 1998, 2012; Hayashida et al., 2008; Kato et al., 2012, 2013; Ueno et al., 2012).