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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 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 H o, H e and R s 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 F ST 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. © 2012 Association of Applied Biologists.


Documento: Artículo
Título:Genetic diversity of maize landraces from lowland and highland agro-ecosystems of Southern South America: Implications for the conservation of native resources
Autor:Bracco, M.; Lia, V.V.; Hernández, J.C.; Poggio, L.; Gottlieb, A.M.
Filiación:Departamento de Ecología, Genética y Evoluciõn, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autõnoma de Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Instituto de Biotecnología, CICVyA, INTA, Castelar Los Reseros y Las Cabañ as s/n (B1686ICG), Hurlingham, Buenos Aires, Argentina
Laboratorio de Recursos Genéticos Vegetales 'N.i. Vavilov', Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Conservation genetics; maize landraces; microsatellites; Northern Argentina; agricultural ecosystem; agricultural land; Bayesian analysis; cluster analysis; conservation genetics; cultivar; environmental change; functional change; genetic marker; genetic resource; genetic variation; germplasm; lowland environment; maize; native species; population structure; relatedness; resource management; species conservation; species pool; upland region; Argentina; South America; Zea mays
Página de inicio:308
Página de fin:321
Título revista:Annals of Applied Biology
Título revista abreviado:Ann. App. Biol.


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---------- APA ----------
Bracco, M., Lia, V.V., Hernández, J.C., Poggio, L. & Gottlieb, A.M. (2012) . Genetic diversity of maize landraces from lowland and highland agro-ecosystems of Southern South America: Implications for the conservation of native resources. Annals of Applied Biology, 160(3), 308-321.
---------- CHICAGO ----------
Bracco, M., Lia, V.V., Hernández, J.C., Poggio, L., Gottlieb, A.M. "Genetic diversity of maize landraces from lowland and highland agro-ecosystems of Southern South America: Implications for the conservation of native resources" . Annals of Applied Biology 160, no. 3 (2012) : 308-321.
---------- MLA ----------
Bracco, M., Lia, V.V., Hernández, J.C., Poggio, L., Gottlieb, A.M. "Genetic diversity of maize landraces from lowland and highland agro-ecosystems of Southern South America: Implications for the conservation of native resources" . Annals of Applied Biology, vol. 160, no. 3, 2012, pp. 308-321.
---------- VANCOUVER ----------
Bracco, M., Lia, V.V., Hernández, J.C., Poggio, L., Gottlieb, A.M. Genetic diversity of maize landraces from lowland and highland agro-ecosystems of Southern South America: Implications for the conservation of native resources. Ann. App. Biol. 2012;160(3):308-321.