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<p>Rapeseed is a major oilseed crop in China, and enhancing rapeseed yield represent a key goal for breeding programs. Among the three rapeseed main yield components, 1000-seed weight (TSW) is a pivotal factor. The high-yield hybrid variety ‘Dadi199’ is one of the most widely planted cultivars in China, with a very high TSW. In this study, we evaluated the TSW of a doubled haploid population (ZRDH) containing 280 lines derived from Dadi199 across four distinct environments, with the objective of detecting quantitative trait loci (QTLs) associated with TSW. QTL mapping identified six major, environmentally stable loci on chromosomes A07 and A09 that together explained ~ 55% of the genetic variance in TSW. Furthermore, advantageous alleles associated with TSW QTLs in the A3-1, A8, A9, A7a, and A7b loci were validated in Dadi199. We confirmed that Dadi199 cumulatively inherited favorable alleles at these loci from both parents (ZS11 and R11). Our findings indicate that the enrichment of advantageous alleles/QTLs promotes TSW and ultimately enhances the overall yield of Dadi199. These results provide a valuable reference for understanding the genetic basis of TSW and its role in the genetic improvement of TSW in rapeseed cultivars.</p>

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Multiple-environmental dissecting the genetic architecture of 1000-seed weight in a doubled haploid population derived from rapeseed cultivar ‘Dadi199’

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月10日

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  • Hui Wang,
  • Yunfei Wen,
  • Ashfaq Ayub,
  • Wenxiang Wang,
  • Jia Liu,
  • Chao Li,
  • Li Fu,
  • Ping He,
  • Qiong Hu,
  • Hongtao Cheng,
  • Desheng Mei

摘要

Rapeseed is a major oilseed crop in China, and enhancing rapeseed yield represent a key goal for breeding programs. Among the three rapeseed main yield components, 1000-seed weight (TSW) is a pivotal factor. The high-yield hybrid variety ‘Dadi199’ is one of the most widely planted cultivars in China, with a very high TSW. In this study, we evaluated the TSW of a doubled haploid population (ZRDH) containing 280 lines derived from Dadi199 across four distinct environments, with the objective of detecting quantitative trait loci (QTLs) associated with TSW. QTL mapping identified six major, environmentally stable loci on chromosomes A07 and A09 that together explained ~ 55% of the genetic variance in TSW. Furthermore, advantageous alleles associated with TSW QTLs in the A3-1, A8, A9, A7a, and A7b loci were validated in Dadi199. We confirmed that Dadi199 cumulatively inherited favorable alleles at these loci from both parents (ZS11 and R11). Our findings indicate that the enrichment of advantageous alleles/QTLs promotes TSW and ultimately enhances the overall yield of Dadi199. These results provide a valuable reference for understanding the genetic basis of TSW and its role in the genetic improvement of TSW in rapeseed cultivars.