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Map-based cloning and functional analysis of a major quantitative trait locus, BolC.Pb9.1, controlling clubroot resistance in a wild Brassica relative (Brassica macrocarpa)
Monday, 2024/02/05 | 07:09:31

Xiaoli Zhang, Fengqing HanZhansheng LiZhenghua Wen, Wenjuan ChengXiaozheng ShanDeling Sun & Yumei Liu

Theoretical and Applied Genetics; February 2024; vol. 137; article 41

 

Description: http://iasvn.org/Images_upload/images/h2%2877%29.png

                      Clubroot disease; a great threat to Brassica oleracea

 

Key message

A causal gene BoUGT76C2, conferring clubroot resistance in wild Brassica oleracea, was identified and functionally characterized.

 

Abstract

 

Clubroot is a devastating soil-borne disease caused by the obligate biotrophic pathogen Plasmodiophora brassica (P. brassicae), which poses a great threat to Brassica oleracea (B. oleracea) production. Although several QTLs associated with clubroot resistance (CR) have been mapped in cultivated B. oleracea, none have been cloned in B. oleracea. Previously, we found that the wild B. oleracea B2013 showed high resistance to clubroot. In this study, we constructed populations using B2013 and broccoli line 90196. CR in B2013 is quantitatively inherited, and a major QTL, BolC.Pb9.1, was identified on C09 using QTL-seq and linkage analysis. The BolC.Pb9.1 was finely mapped to a 56 kb genomic region using F2:3 populations. From the target region, the candidate BoUGT76C2 showed nucleotide variations between the parents, and was inducible in response to P. brassicae infection. We generated BoUGT76C2 overexpression lines in the 90196 background, which showed significantly enhanced resistance to P. brassicae compared to the WT line, suggesting that BoUGT76C2 corresponds to the resistance gene BolC.Pb.9.1. This is the first report on the CR gene map-based cloning and functional analysis from wild relatives, which provides a theoretical basis to the understanding of the molecular mechanism of CR, and lays a foundation to improve the CR of cultivated B. oleracea.

 

See https://link.springer.com/article/10.1007/s00122-024-04543-x

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