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Abstract
The North of Argentina is one of the southernmost areas of maize landrace cultivation. Two distinct centres of diversity have been distinguished within this region: Northwestern Argentina (NWA), and Northeastern Argentina (NEA). Nowadays, maize landraces from this area are faced with two main risks. On the one hand, significant structural and functional changes have modified the rural environment with the boundaries of cropland areas experiencing a rapid [ver mas...]
dc.contributor.authorBracco, Mariana
dc.contributor.authorLia, Veronica Viviana
dc.contributor.authorHernández, J.C.
dc.contributor.authorPoggio, Lidia
dc.contributor.authorGottlieb, Alexandra Marina
dc.date.accessioned2019-11-04T12:36:07Z
dc.date.available2019-11-04T12:36:07Z
dc.date.issued2012-05
dc.identifier.issn0003-4746
dc.identifier.issn1744-7348
dc.identifier.otherhttps://doi.org/10.1111/j.1744-7348.2012.00544.x
dc.identifier.urihttps://onlinelibrary.wiley.com/doi/abs/10.1111/j.1744-7348.2012.00544.x
dc.identifier.urihttp://hdl.handle.net/20.500.12123/6271
dc.description.abstractThe North of Argentina is one of the southernmost areas of maize landrace cultivation. Two distinct centres of diversity have been distinguished within this region: Northwestern Argentina (NWA), and Northeastern Argentina (NEA). Nowadays, maize landraces from this area are faced with two main risks. On the one hand, significant structural and functional changes have modified the rural environment with the boundaries of cropland areas experiencing a rapid expansion at the expense of northern natural forests and rangelands; and on the other, native gene pools are increasingly threatened by hybrids and commercial varieties which are more attractive relative to landraces. The first step towards any conservational action is the acquisition of an inclusive knowledge of the biological resources. For this purpose, our study assesses the genetic diversity and population dynamics of maize landraces from Northern Argentina using microsatellite markers. The Northeastern lowland region (NEA) was represented by 12 landraces (19 populations). In addition, six landraces (eight populations) from the Northwestern highland region (NWA) were used for comparison. For the NEA data set, a total of 126 alleles were found, with an average of 10.5 alleles per locus. Mean Ho, He and Rs were 0.350, 0.467 and 2.72, respectively. Global fit to Hardy–Weinberg proportions was observed in 7 of 19 populations. Global estimates of FST revealed significant differentiation among populations. Bayesian analyses of population structure allowed the recognition of two main gene pools (popcorns versus floury landraces). When NWA was added to the analysis, three clusters were distinguished: NEA popcorns, NEA flours and NWA racial complexes. Additional information on the relationships among these groups was retrieved from cluster analyses. This study shows that lowland landraces from Northern Argentina harbour considerable levels of genetic diversity, with contributions from different gene pools. Further studies encompassing a larger number of populations from the NEA region will certainly help to detect additional genetic variation, which may prove highly valuable in germplasm conservation and management. Future conservation efforts should focus on preserving NEA popcorns, NEA floury and NWA racial complexes as different management units.eng
dc.formatapplication/pdfes_AR
dc.language.isoenges_AR
dc.publisherWileyes_AR
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_AR
dc.sourceAnnals of Applied Biology 160 (3) : 308-321 (May 2012)es_AR
dc.subjectMaízes_AR
dc.subjectMaizeeng
dc.subjectCultivoes_AR
dc.subjectCultivationeng
dc.subjectDiversidad Genética (como Recurso)es_AR
dc.subjectGenetic Diversity (as Resource)eng
dc.subjectAgroecosistemases_AR
dc.subjectAgroecosystemseng
dc.subjectConservación de los Recursoses_AR
dc.subjectResource Conservationeng
dc.subjectMarcadores Genéticoses_AR
dc.subjectGenetic Markerseng
dc.subjectMicrosatéliteses_AR
dc.subjectMicrosatelliteseng
dc.subjectArgentinaes_AR
dc.subject.otherMarcadores Moleculareses_AR
dc.subject.otherRegión Noroeste, Argentinaes_AR
dc.subject.otherRegión Noreste, Argentinaes_AR
dc.titleGenetic diversity of maize landraces from lowland and highland agro‐ecosystems of Southern South America: implications for the conservation of native resourceses_AR
dc.typeinfo:ar-repo/semantics/artículoes_AR
dc.typeinfo:eu-repo/semantics/articlees_AR
dc.typeinfo:eu-repo/semantics/publishedVersiones_AR
dc.description.origenInstituto de Biotecnologíaes_AR
dc.description.filFil: Bracco, Mariana. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución. Laboratorio de Citogenética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentinaes_AR
dc.description.filFil: Lia, Veronica Viviana. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Biotecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.es_AR
dc.description.filFil: Hernández, J.C. Universidad de Buenos Aires. Facultad de Agronomía. Laboratorio de Recursos Genéticos Vegetales; Argentinaes_AR
dc.description.filFil: Poggio, Lidia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución. Laboratorio de Citogenética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentinaes_AR
dc.description.filFil: Gottlieb, Alexandra Marina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución. Laboratorio de Citogenética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentinaes_AR
dc.subtypecientifico


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