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Abstract
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 [ver mas...]
dc.contributor.authorCamadro, Elsa Lucila
dc.contributor.authorErazzu, Luis Ernesto
dc.contributor.authorMaune, Juan Federico
dc.contributor.authorBedogni, Maria Cecilia
dc.date.accessioned2019-04-08T13:53:04Z
dc.date.available2019-04-08T13:53:04Z
dc.date.issued2012-07
dc.identifier.issn1435-8603
dc.identifier.issn1438-8677
dc.identifier.otherhttps://doi.org/10.1111/j.1438-8677.2012.00563.x
dc.identifier.urihttps://onlinelibrary.wiley.com/doi/abs/10.1111/j.1438-8677.2012.00563.x
dc.identifier.urihttp://hdl.handle.net/20.500.12123/4840
dc.description.abstractWild 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.eng
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherWileyes_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourcePlant Biology 14 (4) : 543-554 (July 2012)es_AR
dc.subjectPapaes_AR
dc.subjectPotatoeseng
dc.subjectPlantas Silvestreses_AR
dc.subjectWild Plantseng
dc.subjectGenéticaes_AR
dc.subjectGeneticseng
dc.subjectHibridaciónes_AR
dc.subjectHybridizationeng
dc.subjectIntrogresiónes_AR
dc.subjectIntrogressioneng
dc.subjectVariación Genéticaes_AR
dc.subjectGenetic Variationeng
dc.titleA genetic approach to the species problem in wild potatoes_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenEEA Balcarcees_AR
dc.description.filFil: 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; Argentinaes_AR
dc.description.filFil: Erazzu, Luis Ernesto. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Famaillá; Argentina. Universidad Nacional de Tucumán. Facultad de Agronomía; Argentinaes_AR
dc.description.filFil: 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; Argentinaes_AR
dc.description.filFil: Bedogni, Maria Cecilia. Estación Experimental Agropecuaria Balcarce; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; Argentinaes_AR
dc.subtypecientifico


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