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<p>In this study, we provide the first molecular-level dissection of the elite tetraploid potato parent Kexin23, elucidating the genetic basis of its superior breeding performance. Kexin23 exhibited an early maturity trait that was comparable to its female parent Kexin4 and stably transmitted to its progeny, indicating the inheritance of robust early-maturity genetic segments. Genetic structure analysis based on 465,000 SNP variants demonstrated that the parental contributions of Aula and Kexin4 to Kexin25 exceeded that to Kexin23, reflecting an asymmetric genetic contribution to Kexin23. A total of 5,147 Kexin23-specific variants were identified, which was significantly more than that in its sister line Kexin25 with 70 located in coding regions. Among these, the key gene <i>C88_C12H1G014800</i> (encoding a zinc-finger protein) contained a premature termination mutation that suppressed expression, potentially associated with early maturity or high pollen viability. SNP analysis indicated that loci derived from Kexin23 in its offspring were enriched on chromosome Chr1-3 (with high Aula contribution) and chromosomes Chr2-1 and Chr4-2 (with high Kexin4 contribution). Contribution analysis revealed that Kexin23 transmitted an average of 55.75% of its genetic material to its offspring, with 44.02% derived from specific variants. These findings systematically reveal the convergence of asymmetric inheritance, elite-specific variation, and selective haplotype transmission in the formation of a superior parent. This study establishes a molecular framework for understanding elite parentage in tetraploid potato and provides concrete targets for marker-assisted selection and genomic editing to accelerate the breeding of early-maturing cultivars.</p>

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Resequencing elucidates the genetic mechanism underlying elite early-maturing potato parent Kexin23

  • 期刊论文

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  • 发表日期：

    2026年4月9日

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  • Yue Wang,
  • Yunfei Gao,
  • Qiao Wang,
  • Bin Yan,
  • Zhimin Niu,
  • Xiangri Nan,
  • Wanmin Sheng,
  • Qingquan Li

摘要

In this study, we provide the first molecular-level dissection of the elite tetraploid potato parent Kexin23, elucidating the genetic basis of its superior breeding performance. Kexin23 exhibited an early maturity trait that was comparable to its female parent Kexin4 and stably transmitted to its progeny, indicating the inheritance of robust early-maturity genetic segments. Genetic structure analysis based on 465,000 SNP variants demonstrated that the parental contributions of Aula and Kexin4 to Kexin25 exceeded that to Kexin23, reflecting an asymmetric genetic contribution to Kexin23. A total of 5,147 Kexin23-specific variants were identified, which was significantly more than that in its sister line Kexin25 with 70 located in coding regions. Among these, the key gene C88_C12H1G014800 (encoding a zinc-finger protein) contained a premature termination mutation that suppressed expression, potentially associated with early maturity or high pollen viability. SNP analysis indicated that loci derived from Kexin23 in its offspring were enriched on chromosome Chr1-3 (with high Aula contribution) and chromosomes Chr2-1 and Chr4-2 (with high Kexin4 contribution). Contribution analysis revealed that Kexin23 transmitted an average of 55.75% of its genetic material to its offspring, with 44.02% derived from specific variants. These findings systematically reveal the convergence of asymmetric inheritance, elite-specific variation, and selective haplotype transmission in the formation of a superior parent. This study establishes a molecular framework for understanding elite parentage in tetraploid potato and provides concrete targets for marker-assisted selection and genomic editing to accelerate the breeding of early-maturing cultivars.