A genetic approach to the species problem in wild potato
Wild potatoes are native to the Americas, where they present very wide geographical and ecological distribution. Most are diploid, obligate out‐crossers due to a multiallelic gametophytic self‐incompatibility (S) locus that prevents self‐fertilisation and crossing between individuals carrying identi...
| Main Authors: | , , , |
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| Format: | Artículo |
| Language: | Inglés |
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Wiley
2019
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| Online Access: | https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1438-8677.2012.00563.x http://hdl.handle.net/20.500.12123/4840 https://doi.org/10.1111/j.1438-8677.2012.00563.x |
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| author | Camadro, Elsa Lucila Erazzu, Luis Ernesto Maune, Juan Federico Bedogni, Maria Cecilia |
| author_browse | Bedogni, Maria Cecilia Camadro, Elsa Lucila Erazzu, Luis Ernesto Maune, Juan Federico |
| author_facet | Camadro, Elsa Lucila Erazzu, Luis Ernesto Maune, Juan Federico Bedogni, Maria Cecilia |
| author_sort | Camadro, Elsa Lucila |
| collection | INTA Digital |
| description | Wild potatoes are native to the Americas, where they present very wide geographical and ecological distribution. Most are diploid, obligate out‐crossers due to a multiallelic gametophytic self‐incompatibility (S) locus that prevents self‐fertilisation and crossing between individuals carrying identical S‐alleles. They have two alternative modes of reproduction: sexual (by seeds) and asexual (by stolons and tubers), which provide, respectively, for genetic flexibility in changing environments and high fitness of adapted genotypes under stable conditions. Since the early twentieth century, their taxonomic classification has been mostly based on morphological phenotypes (Taxonomic Species Concept). More recently, attempts have been made to establish phylogenetic relationships, applying molecular tools in samples of populations (accessions) with a previously assigned specific category. However, neither the reproductive biology and breeding relations among spontaneous populations nor the morphological and genetic variability expected in obligate allogamous populations are considered when the taxonomic species concept is applied. In nature, wild potato populations are isolated through external and internal hybridisation barriers; the latter, which are genetically determined, can be either pre‐zygotic (pollen–pistil incompatibility) or post‐zygotic (abortion of embryo, endosperm or both tissues, sterility, and hybrid weakness and breakdown in segregating generations). The internal barriers, however, can be incomplete, providing opportunities for hybridisation and introgression within and between populations and ploidy levels in areas of overlap. The widespread occurrence of spontaneous hybrids in nature was recognised in the mid‐twentieth century. Using genetic approaches, results have been obtained that provide strong support to the assertion that populations are at different stages of genetic divergence and are not at the end of the evolutionary process, as presupposed by the Taxonomic Species Concept. Furthermore, since wild potatoes have uniparental and biparental overlapping generations, the Biological Species Concept – developed for sexually reproducing biparental organisms – cannot be applied to them. In this paper, morphological, genetic, molecular and taxonomic studies in wild potato are reviewed, considering the genetic consequences of their reproductive biology, in an attempt to shed light on the species problem, because of its relevance in germplasm conservation and breeding. |
| format | Artículo |
| id | INTA4840 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | INTA48402024-10-28T16:08:12Z A genetic approach to the species problem in wild potato Camadro, Elsa Lucila Erazzu, Luis Ernesto Maune, Juan Federico Bedogni, Maria Cecilia Papa Plantas Silvestres Genética Hibridación Introgresión Variación Genética Potatoes Wild Plants Genetics Hybridization Introgression Genetic Variation Wild potatoes are native to the Americas, where they present very wide geographical and ecological distribution. Most are diploid, obligate out‐crossers due to a multiallelic gametophytic self‐incompatibility (S) locus that prevents self‐fertilisation and crossing between individuals carrying identical S‐alleles. They have two alternative modes of reproduction: sexual (by seeds) and asexual (by stolons and tubers), which provide, respectively, for genetic flexibility in changing environments and high fitness of adapted genotypes under stable conditions. Since the early twentieth century, their taxonomic classification has been mostly based on morphological phenotypes (Taxonomic Species Concept). More recently, attempts have been made to establish phylogenetic relationships, applying molecular tools in samples of populations (accessions) with a previously assigned specific category. However, neither the reproductive biology and breeding relations among spontaneous populations nor the morphological and genetic variability expected in obligate allogamous populations are considered when the taxonomic species concept is applied. In nature, wild potato populations are isolated through external and internal hybridisation barriers; the latter, which are genetically determined, can be either pre‐zygotic (pollen–pistil incompatibility) or post‐zygotic (abortion of embryo, endosperm or both tissues, sterility, and hybrid weakness and breakdown in segregating generations). The internal barriers, however, can be incomplete, providing opportunities for hybridisation and introgression within and between populations and ploidy levels in areas of overlap. The widespread occurrence of spontaneous hybrids in nature was recognised in the mid‐twentieth century. Using genetic approaches, results have been obtained that provide strong support to the assertion that populations are at different stages of genetic divergence and are not at the end of the evolutionary process, as presupposed by the Taxonomic Species Concept. Furthermore, since wild potatoes have uniparental and biparental overlapping generations, the Biological Species Concept – developed for sexually reproducing biparental organisms – cannot be applied to them. In this paper, morphological, genetic, molecular and taxonomic studies in wild potato are reviewed, considering the genetic consequences of their reproductive biology, in an attempt to shed light on the species problem, because of its relevance in germplasm conservation and breeding. EEA Balcarce Fil: Camadro, Elsa Lucila. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Erazzu, Luis Ernesto. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Famaillá; Argentina. Universidad Nacional de Tucumán. Facultad de Agronomía; Argentina Fil: Maune, Juan Federico. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Bedogni, Maria Cecilia. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Balcarce; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentina 2019-04-08T13:53:04Z 2019-04-08T13:53:04Z 2012-07 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1438-8677.2012.00563.x http://hdl.handle.net/20.500.12123/4840 1435-8603 1438-8677 https://doi.org/10.1111/j.1438-8677.2012.00563.x eng info:eu-repo/semantics/restrictedAccess application/pdf Wiley Plant Biology 14 (4) : 543-554 (July 2012) |
| spellingShingle | Papa Plantas Silvestres Genética Hibridación Introgresión Variación Genética Potatoes Wild Plants Genetics Hybridization Introgression Genetic Variation Camadro, Elsa Lucila Erazzu, Luis Ernesto Maune, Juan Federico Bedogni, Maria Cecilia A genetic approach to the species problem in wild potato |
| title | A genetic approach to the species problem in wild potato |
| title_full | A genetic approach to the species problem in wild potato |
| title_fullStr | A genetic approach to the species problem in wild potato |
| title_full_unstemmed | A genetic approach to the species problem in wild potato |
| title_short | A genetic approach to the species problem in wild potato |
| title_sort | genetic approach to the species problem in wild potato |
| topic | Papa Plantas Silvestres Genética Hibridación Introgresión Variación Genética Potatoes Wild Plants Genetics Hybridization Introgression Genetic Variation |
| url | https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1438-8677.2012.00563.x http://hdl.handle.net/20.500.12123/4840 https://doi.org/10.1111/j.1438-8677.2012.00563.x |
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