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Genetic structure in cultivated quinoa [Chenopodium quinoa Willd.], a reflection of landscape structure in Northwest Argentina

Colaborador(es): Costa Tártara, S. M | Manifesto, M. M | Bramardi, Sergio Jorge | Bertero, Héctor Daniel.
ISSN: 1566-0621.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): CLUSTER ANALYSIS | GENETIC DIVERSITY | GERMPLASM | MICROSATELLITES | NORTHWEST ARGENTINA | QUINOA | ALLELE | CULTIVATION | DICOTYLEDON | GENETIC MARKER | GENETIC STRUCTURE | GEOGRAPHICAL DISTRIBUTION | LANDSCAPE STRUCTURE | PROTEIN | UPLAND REGION | ANDES | ARGENTINA | CHENOPODIUM QUINOA | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: Conservation Genetics vol.13, no.4 (2012), p.1027-1038Resumen: Quinoa [Chenopodium quinoa Willd.], one of the main crops domesticated in the Andean highlands 1,000 of years ago, played an important role as a protein source. 35 germplasm accessions collected along the Northwest Argentina [NWA] region were studied using 22 microsatellite [SSR] markers. Results showed a great level of genetic diversity, differing from previous reports about the geographical distribution of quinoa variability. All SSR loci analysed were highly polymorphic detecting a total of 354 alleles among all populations, with an average of 16 alleles per locus. Cluster analyses grouped the accessions into four main clusters at the average genetic distance level [0.80], each of which represented a different environment of the NWA region: Puna [UHe = 0.42, ±0.07 SE], Dry Valleys [UHe = 0.27, ±0.05 SE], Eastern Humid Valleys [UHe = 0.16, ±0.04 SE] and a transition area with high altitudes between the last two environments [UHe = 0.25, ±0.03 SE]. An eastward decreasing genetic diversity gradient was found. AMOVA analyses showed a strong genetic structure: a high population subdivision relative to the grouping by region [Fsr = 0.47] together with a high genetic differentiation among populations [Fst = 0.58] and a heterozygous defect [Fis = 0.63] in each of them. The variability structure, a reflection of the structure of the NWA landscapes, is discussed in connection with environmental variables.
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Quinoa [Chenopodium quinoa Willd.], one of the main crops domesticated in the Andean highlands 1,000 of years ago, played an important role as a protein source. 35 germplasm accessions collected along the Northwest Argentina [NWA] region were studied using 22 microsatellite [SSR] markers. Results showed a great level of genetic diversity, differing from previous reports about the geographical distribution of quinoa variability. All SSR loci analysed were highly polymorphic detecting a total of 354 alleles among all populations, with an average of 16 alleles per locus. Cluster analyses grouped the accessions into four main clusters at the average genetic distance level [0.80], each of which represented a different environment of the NWA region: Puna [UHe = 0.42, ±0.07 SE], Dry Valleys [UHe = 0.27, ±0.05 SE], Eastern Humid Valleys [UHe = 0.16, ±0.04 SE] and a transition area with high altitudes between the last two environments [UHe = 0.25, ±0.03 SE]. An eastward decreasing genetic diversity gradient was found. AMOVA analyses showed a strong genetic structure: a high population subdivision relative to the grouping by region [Fsr = 0.47] together with a high genetic differentiation among populations [Fst = 0.58] and a heterozygous defect [Fis = 0.63] in each of them. The variability structure, a reflection of the structure of the NWA landscapes, is discussed in connection with environmental variables.

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