Scholarlink

<p>Bell pepper (<i>Capsicum annuum</i> L. var. <i>grossum</i> Sendt.) is a nutritionally rich and economically important crop of the Solanaceae family, valued for its therapeutic properties and export potential. However, its cultivation under diverse agro-climatic conditions exposes it to several biotic and abiotic stresses, highlighting the need to exploit genetic variability for crop improvement. In this study, 26 bell pepper genotypes were analysed to explore genetic diversity and population differentiation. Evaluation was performed based on 24 traits, including 9 DUS descriptors, 12 quantitative traits, and 3 quality-related traits, along with 75 SSR markers. Among the DUS descriptors, eight were polymorphic, with “Fruit: Shape in longitudinal section” exhibiting the highest variability (1.54). Mahalanobis D² statistic grouped the genotypes into six distinct clusters. Out of the 75 SSR markers, 31 were polymorphic and generated 130 alleles, with a mean of 4.19 alleles per locus. The polymorphism information content (PIC) varied from 0.29 to 0.78 (mean: 0.58), indicating moderate to high genetic diversity. Cluster analysis using UPGMA separated the genotypes into two main groups, while Neighbor-Joining and STRUCTURE analyses identified three subgroups. Fourteen genotypes consistently grouped across both phenotypic and molecular analyses and exhibited resistance to bacterial wilt. A strong correlation between phenotypic and molecular datasets (Mantel test: <i>R</i> = 0.7689) confirms the utility of an integrated approach for identifying genetically diverse and disease-resistant parental lines for bell pepper breeding programmes.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Multi-year evaluation of genetic variability and population structure in bell pepper using integrated phenotypic traits and SSR marker data

  • 期刊论文

  • 发表日期：

    2026年3月7日

查看全文
  • Sonia Sood,
  • Tamanna Sood,
  • V. K. Sood,
  • Jasdeep Kaur,
  • Anuradha,
  • Aakriti,
  • Mitali Sharma

摘要

Bell pepper (Capsicum annuum L. var. grossum Sendt.) is a nutritionally rich and economically important crop of the Solanaceae family, valued for its therapeutic properties and export potential. However, its cultivation under diverse agro-climatic conditions exposes it to several biotic and abiotic stresses, highlighting the need to exploit genetic variability for crop improvement. In this study, 26 bell pepper genotypes were analysed to explore genetic diversity and population differentiation. Evaluation was performed based on 24 traits, including 9 DUS descriptors, 12 quantitative traits, and 3 quality-related traits, along with 75 SSR markers. Among the DUS descriptors, eight were polymorphic, with “Fruit: Shape in longitudinal section” exhibiting the highest variability (1.54). Mahalanobis D² statistic grouped the genotypes into six distinct clusters. Out of the 75 SSR markers, 31 were polymorphic and generated 130 alleles, with a mean of 4.19 alleles per locus. The polymorphism information content (PIC) varied from 0.29 to 0.78 (mean: 0.58), indicating moderate to high genetic diversity. Cluster analysis using UPGMA separated the genotypes into two main groups, while Neighbor-Joining and STRUCTURE analyses identified three subgroups. Fourteen genotypes consistently grouped across both phenotypic and molecular analyses and exhibited resistance to bacterial wilt. A strong correlation between phenotypic and molecular datasets (Mantel test: R = 0.7689) confirms the utility of an integrated approach for identifying genetically diverse and disease-resistant parental lines for bell pepper breeding programmes.