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Abstract:

Acacia caven is a South American species which shows remarkable climate tolerance and ecological adaptability; as such, this species is suitable for colonizing anthropogenically degraded sites. This species is widely distributed, and six varieties have been described based on both morphological traits and molecular markers. Moreover, Aronson (1992) suggests that, for this species, geographical separation could be associated with ecological differentiation. In this study, amplified fragment length polymorphisms were used to study genetic variation within and among 15 populations of A. caven from five eco-regions of Argentina and to investigate (1) whether the varieties are genetically coherent, (2) whether the varieties correspond consistently to a single eco-region, (3) the proportion of the species diversity explained within and among varieties and eco-regions. Eight of the 225 bands appear to be under positive selection. The remaining 217 neutral loci showed a high percentage of polymorphism (99. 1%). The estimates of genetic diversity H j were generally high. The F ST (0. 315) was highly significant, providing evidence for genetic structure among populations. Hierarchical analysis of molecular variance indicated that variation among eco-regions was 8. 2% and highly significant. The higher component of variance was found within populations (67. 5%). STRUCTURE analysis suggested that the optimal number of K = 11. The results showed that, in most cases, geographic separation is associated with ecological differentiation. Since differentiation of A. caven populations studied here in eco-regions was highly significant, sampling should include a large number of trees within populations as well as covering the wide ecological diversity of the species. © 2012 Springer-Verlag.

Registro:

Documento: Artículo
Título:Landscape genetic structure of natural populations of Acacia caven in Argentina
Autor:Pometti, C.L.; Bessega, C.F.; Vilardi, J.C.; Saidman, B.O.
Filiación:Departamento de Ecología, Genética y Evolución, Pabellón 2, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Palabras clave:Acacia caven; AFLP; Eco-regions; Genetic structure; Natural populations; Varieties; Acacia; Acacia caven
Año:2012
Volumen:8
Número:4
Página de inicio:911
Página de fin:924
DOI: http://dx.doi.org/10.1007/s11295-012-0479-6
Título revista:Tree Genetics and Genomes
Título revista abreviado:Tree Genet. Genomes
ISSN:16142942
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16142942_v8_n4_p911_Pometti

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Citas:

---------- APA ----------
Pometti, C.L., Bessega, C.F., Vilardi, J.C. & Saidman, B.O. (2012) . Landscape genetic structure of natural populations of Acacia caven in Argentina. Tree Genetics and Genomes, 8(4), 911-924.
http://dx.doi.org/10.1007/s11295-012-0479-6
---------- CHICAGO ----------
Pometti, C.L., Bessega, C.F., Vilardi, J.C., Saidman, B.O. "Landscape genetic structure of natural populations of Acacia caven in Argentina" . Tree Genetics and Genomes 8, no. 4 (2012) : 911-924.
http://dx.doi.org/10.1007/s11295-012-0479-6
---------- MLA ----------
Pometti, C.L., Bessega, C.F., Vilardi, J.C., Saidman, B.O. "Landscape genetic structure of natural populations of Acacia caven in Argentina" . Tree Genetics and Genomes, vol. 8, no. 4, 2012, pp. 911-924.
http://dx.doi.org/10.1007/s11295-012-0479-6
---------- VANCOUVER ----------
Pometti, C.L., Bessega, C.F., Vilardi, J.C., Saidman, B.O. Landscape genetic structure of natural populations of Acacia caven in Argentina. Tree Genet. Genomes. 2012;8(4):911-924.
http://dx.doi.org/10.1007/s11295-012-0479-6