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Liang Chai,Jinfang Zhang,Wannakuwattewaduge Gerard Dilantha Fernando,Haojie Li,Xiaoqin Huang,Cheng Cui,Jun Jiang,Benchuan Zheng,Yong Liu,Liangcai Jiang 한국식물병리학회 2021 Plant Pathology Journal Vol.37 No.2
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 dis- ease resistance to have excellent blackleg-resistant cul- tivars 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 deter- mined their glucosinolate and erucic acid content and confirmed 17 double-low materials. A recently devel- oped 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 Chi- na in the future and a robust and less labor consuming method to identify resistance in canola germplasm.