ArticleJournal of applied genetics2026
Multi-year evaluation of genetic variability and population structure in bell pepper using integrated phenotypic traits and SSR marker data.
Article in Journal of applied genetics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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7 authors.
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Abstract
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.
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