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Genetic diversity in Capsicum baccatum is significantly influenced by its ecogeographical distribution

BACKGROUND: The exotic pepper species Capsicum baccatum, also known as the aji or Peruvian hot pepper, is comprised of wild and domesticated botanical forms. The species is a valuable source of new genes useful for improving fruit quality and disease resistance in C. annuum sweet bell and hot chile...

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Autores principales: Albrecht, Elena, Zhang, Dapeng, Mays, Anne Deslattes, Saftner, Robert A, Stommel, John R
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2012
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Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3496591/
https://www.ncbi.nlm.nih.gov/pubmed/22866868
http://dx.doi.org/10.1186/1471-2156-13-68
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author Albrecht, Elena
Zhang, Dapeng
Mays, Anne Deslattes
Saftner, Robert A
Stommel, John R
author_facet Albrecht, Elena
Zhang, Dapeng
Mays, Anne Deslattes
Saftner, Robert A
Stommel, John R
author_sort Albrecht, Elena
collection PubMed
description BACKGROUND: The exotic pepper species Capsicum baccatum, also known as the aji or Peruvian hot pepper, is comprised of wild and domesticated botanical forms. The species is a valuable source of new genes useful for improving fruit quality and disease resistance in C. annuum sweet bell and hot chile pepper. However, relatively little research has been conducted to characterize the species, thus limiting its utilization. The structure of genetic diversity in a plant germplasm collection is significantly influenced by its ecogeographical distribution. Together with DNA fingerprints derived from AFLP markers, we evaluated variation in fruit and plant morphology of plants collected across the species native range in South America and evaluated these characters in combination with the unique geography, climate and ecology at different sites where plants originated. RESULTS: The present study mapped the ecogeographic distribution, analyzed the spatial genetic structure, and assessed the relationship between the spatial genetic pattern and the variation of morphological traits in a diverse C. baccatum germplasm collection spanning the species distribution. A combined diversity analysis was carried out on the USDA-ARS C. baccatum germplasm collection using data from GIS, morphological traits and AFLP markers. The results demonstrate that the C. baccatum collection covers wide geographic areas and is adapted to divergent ecological conditions in South America ranging from cool Andean highland to Amazonia rainforest. A high level of morphological diversity was evident in the collection, with fruit weight the leading variable. The fruit weight distribution pattern was compatible to AFLP-based clustering analysis for the collection. A significant spatial structure was observed in the C. baccatum gene pool. Division of the domesticated germplasm into two major regional groups (Western and Eastern) was further supported by the pattern of spatial population structure. CONCLUSIONS: The results reported improve our understanding of the combined effects of geography, ecology and human intervention on organization of the C. baccatum genepool. The results will facilitate utilization of C. baccatum for crop improvement and species conservation by providing a framework for efficient germplasm collection management and guidance for future plant acquisitions.
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spelling pubmed-34965912012-11-14 Genetic diversity in Capsicum baccatum is significantly influenced by its ecogeographical distribution Albrecht, Elena Zhang, Dapeng Mays, Anne Deslattes Saftner, Robert A Stommel, John R BMC Genet Research Article BACKGROUND: The exotic pepper species Capsicum baccatum, also known as the aji or Peruvian hot pepper, is comprised of wild and domesticated botanical forms. The species is a valuable source of new genes useful for improving fruit quality and disease resistance in C. annuum sweet bell and hot chile pepper. However, relatively little research has been conducted to characterize the species, thus limiting its utilization. The structure of genetic diversity in a plant germplasm collection is significantly influenced by its ecogeographical distribution. Together with DNA fingerprints derived from AFLP markers, we evaluated variation in fruit and plant morphology of plants collected across the species native range in South America and evaluated these characters in combination with the unique geography, climate and ecology at different sites where plants originated. RESULTS: The present study mapped the ecogeographic distribution, analyzed the spatial genetic structure, and assessed the relationship between the spatial genetic pattern and the variation of morphological traits in a diverse C. baccatum germplasm collection spanning the species distribution. A combined diversity analysis was carried out on the USDA-ARS C. baccatum germplasm collection using data from GIS, morphological traits and AFLP markers. The results demonstrate that the C. baccatum collection covers wide geographic areas and is adapted to divergent ecological conditions in South America ranging from cool Andean highland to Amazonia rainforest. A high level of morphological diversity was evident in the collection, with fruit weight the leading variable. The fruit weight distribution pattern was compatible to AFLP-based clustering analysis for the collection. A significant spatial structure was observed in the C. baccatum gene pool. Division of the domesticated germplasm into two major regional groups (Western and Eastern) was further supported by the pattern of spatial population structure. CONCLUSIONS: The results reported improve our understanding of the combined effects of geography, ecology and human intervention on organization of the C. baccatum genepool. The results will facilitate utilization of C. baccatum for crop improvement and species conservation by providing a framework for efficient germplasm collection management and guidance for future plant acquisitions. BioMed Central 2012-08-06 /pmc/articles/PMC3496591/ /pubmed/22866868 http://dx.doi.org/10.1186/1471-2156-13-68 Text en Copyright ©2012 Albrecht et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Albrecht, Elena
Zhang, Dapeng
Mays, Anne Deslattes
Saftner, Robert A
Stommel, John R
Genetic diversity in Capsicum baccatum is significantly influenced by its ecogeographical distribution
title Genetic diversity in Capsicum baccatum is significantly influenced by its ecogeographical distribution
title_full Genetic diversity in Capsicum baccatum is significantly influenced by its ecogeographical distribution
title_fullStr Genetic diversity in Capsicum baccatum is significantly influenced by its ecogeographical distribution
title_full_unstemmed Genetic diversity in Capsicum baccatum is significantly influenced by its ecogeographical distribution
title_short Genetic diversity in Capsicum baccatum is significantly influenced by its ecogeographical distribution
title_sort genetic diversity in capsicum baccatum is significantly influenced by its ecogeographical distribution
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3496591/
https://www.ncbi.nlm.nih.gov/pubmed/22866868
http://dx.doi.org/10.1186/1471-2156-13-68
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