Abstract:
:Two cabbage (Brassica oleracea) cultivars 'Tekila' and 'Kilaherb' were identified as resistant to several pathotypes of Plasmodiophora brassicae. In this study, we identified a clubroot resistance gene (Rcr7) in 'Tekila' for resistance to pathotype 3 of P. brassicae from a segregating population derived from 'Tekila' crossed with the susceptible line T010000DH3. Genetic mapping was performed by identifying the percentage of polymorphic variants (PPV), a new method proposed in this study, through bulked segregant RNA sequencing. Chromosome C7 carried the highest PPV (42%) compared to the 30-34% in the remaining chromosomes. A peak with PPV (56-73%) was found within the physical interval 41-44 Mb, which indicated that Rcr7 might be located in this region. Kompetitive Allele-Specific PCR was used to confirm the association of Rcr7 with SNPs in the region. Rcr7 was flanked by two SNP markers and co-segregated with three SNP markers in the segregating population of 465 plants. Seven genes encoding TIR-NBS-LRR disease resistance proteins were identified in the target region, but only two genes, Bo7g108760 and Bo7g109000, were expressed. Resistance to pathotype 5X was also mapped to the same region as Rcr7. B. oleracea lines including 'Kilaherb' were tested with five SNP markers for Rcr7 and for resistance to pathotype 3; 11 of 25 lines were resistant, but 'Kilaherb' was the only line that carried the SNP alleles associated with Rcr7. The presence of Rcr7 in 'Kilaherb' for resistance to both pathotypes 3 and 5X was confirmed through linkage analysis.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Dakouri A,Zhang X,Peng G,Falk KC,Gossen BD,Strelkov SE,Yu Fdoi
10.1038/s41598-018-36187-5subject
Has Abstractpub_date
2018-12-05 00:00:00pages
17657issue
1issn
2045-2322pii
10.1038/s41598-018-36187-5journal_volume
8pub_type
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