Genetic diversity in <it>Capsicum baccatum</it> is significantly influenced by its ecogeographical distribution
<p>Abstract</p> <p>Background</p> <p>The exotic pepper species <it>Capsicum baccatum</it>, 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...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2012-08-01
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| Series: | BMC Genetics |
| Online Access: | http://www.biomedcentral.com/1471-2156/13/68 |
| _version_ | 1818040237085949952 |
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| author | Albrecht Elena Zhang Dapeng Mays Anne Saftner Robert A Stommel John R |
| author_facet | Albrecht Elena Zhang Dapeng Mays Anne Saftner Robert A Stommel John R |
| author_sort | Albrecht Elena |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>The exotic pepper species <it>Capsicum baccatum</it>, 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 <it>C. annuum</it> 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.</p> <p>Results</p> <p>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 <it>C. baccatum</it> germplasm collection spanning the species distribution. A combined diversity analysis was carried out on the USDA-ARS <it>C. baccatum</it> germplasm collection using data from GIS, morphological traits and AFLP markers. The results demonstrate that the <it>C. baccatum</it> 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 <it>C. baccatum</it> 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.</p> <p>Conclusions</p> <p>The results reported improve our understanding of the combined effects of geography, ecology and human intervention on organization of the <it>C. baccatum</it> genepool. The results will facilitate utilization of <it>C. baccatum</it> for crop improvement and species conservation by providing a framework for efficient germplasm collection management and guidance for future plant acquisitions.</p> |
| first_indexed | 2024-12-10T08:11:20Z |
| format | Article |
| id | doaj.art-940795bd8861445d86badc4ec33f99d5 |
| institution | Directory Open Access Journal |
| issn | 1471-2156 |
| language | English |
| last_indexed | 2024-12-10T08:11:20Z |
| publishDate | 2012-08-01 |
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| series | BMC Genetics |
| spelling | doaj.art-940795bd8861445d86badc4ec33f99d52022-12-22T01:56:34ZengBMCBMC Genetics1471-21562012-08-011316810.1186/1471-2156-13-68Genetic diversity in <it>Capsicum baccatum</it> is significantly influenced by its ecogeographical distributionAlbrecht ElenaZhang DapengMays AnneSaftner Robert AStommel John R<p>Abstract</p> <p>Background</p> <p>The exotic pepper species <it>Capsicum baccatum</it>, 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 <it>C. annuum</it> 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.</p> <p>Results</p> <p>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 <it>C. baccatum</it> germplasm collection spanning the species distribution. A combined diversity analysis was carried out on the USDA-ARS <it>C. baccatum</it> germplasm collection using data from GIS, morphological traits and AFLP markers. The results demonstrate that the <it>C. baccatum</it> 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 <it>C. baccatum</it> 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.</p> <p>Conclusions</p> <p>The results reported improve our understanding of the combined effects of geography, ecology and human intervention on organization of the <it>C. baccatum</it> genepool. The results will facilitate utilization of <it>C. baccatum</it> for crop improvement and species conservation by providing a framework for efficient germplasm collection management and guidance for future plant acquisitions.</p>http://www.biomedcentral.com/1471-2156/13/68 |
| spellingShingle | Albrecht Elena Zhang Dapeng Mays Anne Saftner Robert A Stommel John R Genetic diversity in <it>Capsicum baccatum</it> is significantly influenced by its ecogeographical distribution BMC Genetics |
| title | Genetic diversity in <it>Capsicum baccatum</it> is significantly influenced by its ecogeographical distribution |
| title_full | Genetic diversity in <it>Capsicum baccatum</it> is significantly influenced by its ecogeographical distribution |
| title_fullStr | Genetic diversity in <it>Capsicum baccatum</it> is significantly influenced by its ecogeographical distribution |
| title_full_unstemmed | Genetic diversity in <it>Capsicum baccatum</it> is significantly influenced by its ecogeographical distribution |
| title_short | Genetic diversity in <it>Capsicum baccatum</it> is significantly influenced by its ecogeographical distribution |
| title_sort | genetic diversity in it capsicum baccatum it is significantly influenced by its ecogeographical distribution |
| url | http://www.biomedcentral.com/1471-2156/13/68 |
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