The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Detection of Blackleg Resistance Gene Rlm1 in Double-Low Rapeseed Accessions from Sichuan Province, by Kompetitive Allele-Specific PCR

  • Chai, Liang (Crop Research Institute, Sichuan Academy of Agricultural Sciences) ;
  • Zhang, Jinfang (Crop Research Institute, Sichuan Academy of Agricultural Sciences) ;
  • Dilantha Fernando, Wannakuwattewaduge Gerard (Department of Plant Science, University of Manitoba) ;
  • Li, Haojie (Crop Research Institute, Sichuan Academy of Agricultural Sciences) ;
  • Huang, Xiaoqin (Institute of Plant Protection, Sichuan Academy of Agricultural Sciences) ;
  • Cui, Cheng (Crop Research Institute, Sichuan Academy of Agricultural Sciences) ;
  • Jiang, Jun (Crop Research Institute, Sichuan Academy of Agricultural Sciences) ;
  • Zheng, Benchuan (Crop Research Institute, Sichuan Academy of Agricultural Sciences) ;
  • Liu, Yong (Institute of Plant Protection, Sichuan Academy of Agricultural Sciences) ;
  • Jiang, Liangcai (Crop Research Institute, Sichuan Academy of Agricultural Sciences)
  • Received : 2020.11.01
  • Accepted : 2021.02.01
  • Published : 2021.04.01
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Abstract

Blackleg is a serious disease in Brassica plants, causing moderate to severe yield losses in rapeseed worldwide. Although China has not suffered from this disease yet (more aggressive Leptosphaeria maculans is not present yet), it is crucial to take provisions in breeding for disease resistance to have excellent blackleg-resistant cultivars already in the fields or in the breeding pipeline. The most efficient strategy for controlling this disease is breeding plants with identified resistance genes. We selected 135 rapeseed accessions in Sichuan, including 30 parental materials and 105 hybrids, and we determined their glucosinolate and erucic acid content and confirmed 17 double-low materials. A recently developed single-nucleotide polymorphism (SNP) marker, SNP_208, was used to genotype allelic Rlm1/rlm1 on chromosome A07, and 87 AvrLm1-resistant materials. Combined with the above-mentioned seed quality data, we identified 11 AvrLm1-resistant double-low rapeseed accessions, including nine parental materials and two hybrids. This study lays the foundation of specific R gene-oriented breeding, in the case that the aggressive Leptosphaeria maculans invades and establishes in China in the future and a robust and less labor consuming method to identify resistance in canola germplasm.

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References

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