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Efficient marker-assisted breeding for clubroot resistance in elite Pol-CMS rapeseed varieties by updating the PbBa8.1 locus

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Abstract

Clubroot disease poses a severe threat to rapeseed (Brassica napus) production worldwide and has recently been spreading across China at an unprecedented pace. Breeding and cultivation of resistant varieties constitute a promising and environment-friendly approach to mitigating this threat. In this study, the clubroot resistance locus PbBa8.1 was successfully transferred into SC4, a shared paternal line of three elite varieties in five generations by marker-assisted backcross breeding. Kompetitive allele specific PCR (KASP) markers of clubroot resistance gene PbBa8.1 and its linked high erucic acid gene (FAE1) were designed and applied for foreground selection, and 1,000 single-nucleotide polymorphisms (SNPs) were selected and used for the background selection. This breeding strategy produced recombinants with the highest recovery ratio of the recurrent parent genome (> 95%) at BC2F2 while breaking the linkage with FAE1 during the selection. An updated version of the paternal line (SC4R) was generated at BC2F3, showing significantly improved clubroot resistance at the seedling stage via artificial inoculation, and was comparable to that of the donor parent. Field trials of the three elite varieties and their updated versions in five environments indicated similar agronomic appearance and final yield. The introduced breeding strategy precisely pyramids the PbBa8.1 and FAE1 loci with the assistance of technical markers in a shorter period and could be applied to other desirable traits for directional improvement in the future.

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Additional datasets generated by this study are included in the Supplementary Materials.

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Acknowledgements

The clubroot-resistant donor parent was generously shared by Prof. Chunyu Zhang. We appreciate Prof. Zhongyun Piao for earlier examination of pathotypes from the Hunan clubroot-infected region. We are deeply thankful for the assistance with agronomic evaluation and field sampling provided by the five local agricultural research institutes of Changsha, Changde, Hengyang, Jishou, and Huaihua.

Funding

This project was supported by grants from the National Key Research and Development Program of China (Grant No. 2021YFD1600500), Natural Science Foundation for Young Scientists of Hunan Province (Grant No. 2021JJ40330), Changsha Municipal Natural Science Foundation (Grant No. kq2014179), and the China Agricultural Research System (CARS-12).

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Yiming Guo and Bao Li conducted the experiments and drafted the manuscript. Mei Li, Liang Qu, and Lianyi Fan were involved in the agronomic evaluation of the previous and updated varieties. Qian Yang took part in data analysis and plotting. Hongjian Zhu and Xinhong Liu participated in the artificial inoculation of seedlings. Tonghua Wang designed the experiment and had oversight of the entire process. All authors read and approved the final manuscript.

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Correspondence to Tonghua Wang.

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Guo, Y., Li, B., Li, M. et al. Efficient marker-assisted breeding for clubroot resistance in elite Pol-CMS rapeseed varieties by updating the PbBa8.1 locus. Mol Breeding 42, 41 (2022). https://doi.org/10.1007/s11032-022-01305-9

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