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<p>The National Sweetpotato Genebank in Vitro (Xuzhou, China) recently collected 1183 sweetpotato accessions, including potential duplicates. To assess genetic diversity and identify redundant accessions, we conducted comprehensive analyses using seven SSR (Simple Sequence Repeat) marker pairs coupled with agronomic trait evaluation. These markers demonstrated high polymorphism, with an average PIC (Polymorphic Information Content) value of 0.7821. Genetic distance-based clustering revealed the genetic similarity among accessions originating from the same geographic regions. Molecular analysis identified 543 duplicates (each sharing zero genetic distance with at least one counterpart) among the 1183 accessions, while 640 accessions were confirmed as genetically unique. Further classification of the 543 duplicates resulted in 130 distinct genetic groups based on zero genetic distance. Subsequent phenotypic characterization, including evaluations of skin color, flesh color, and aboveground morphological traits, revealed 190 additional unique accessions within these groups. Combining these with the initial 640 unique accessions yielded a final collection of 830 genetically distinct germplasm resources. This study significantly enhances germplasm identification efficiency for conservation purposes, provides valuable insights into the genetic diversity and geographical distribution patterns of sweetpotato germplasm, and underscores the importance of targeted collection efforts in regions exhibiting high genetic diversity.</p>

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Genetic diversity analysis and duplicates identification of new sweetpotato accessions collected in China

  • 期刊论文

  • 发表日期：

    2025年5月16日

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  • Jie Wang,
  • Rui Yuan,
  • Qinglian Li,
  • Yao Wang,
  • Donglan Zhao,
  • Lingxiao Zhao,
  • An Zhang,
  • Xibin Dai,
  • Shizhuo Xiao,
  • Tong Ning,
  • Zhilin Zhou,
  • Qinghe Cao

摘要

The National Sweetpotato Genebank in Vitro (Xuzhou, China) recently collected 1183 sweetpotato accessions, including potential duplicates. To assess genetic diversity and identify redundant accessions, we conducted comprehensive analyses using seven SSR (Simple Sequence Repeat) marker pairs coupled with agronomic trait evaluation. These markers demonstrated high polymorphism, with an average PIC (Polymorphic Information Content) value of 0.7821. Genetic distance-based clustering revealed the genetic similarity among accessions originating from the same geographic regions. Molecular analysis identified 543 duplicates (each sharing zero genetic distance with at least one counterpart) among the 1183 accessions, while 640 accessions were confirmed as genetically unique. Further classification of the 543 duplicates resulted in 130 distinct genetic groups based on zero genetic distance. Subsequent phenotypic characterization, including evaluations of skin color, flesh color, and aboveground morphological traits, revealed 190 additional unique accessions within these groups. Combining these with the initial 640 unique accessions yielded a final collection of 830 genetically distinct germplasm resources. This study significantly enhances germplasm identification efficiency for conservation purposes, provides valuable insights into the genetic diversity and geographical distribution patterns of sweetpotato germplasm, and underscores the importance of targeted collection efforts in regions exhibiting high genetic diversity.