Unexpected low genetic differentiation among allopatric species of section Algarobia of Prosopis (Leguminosae)

The Chaqueña Biogeographic Province, in South America, is the main diversity centre of Prosopis. A group of sympatric species of Section Algarobia in this region constitutes a syngameon, characterised by frequent hybridization and introgression. These processes have been postulated as responsible fo...

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Autores principales: Bessega, C., Ferreyra, L., Vilardi, J.C., Saidman, B.O.
Formato: JOUR
Materias:
Allopatric species
Genetic distance
Genetic variability
Hybridization
Isozymes
Prosopis
allopatry
Argentina
enzyme electrophoresis
genetic similarity
genetic variability
geographic distribution
homozygosity
hybridization
isoenzyme
South America
species differentiation
sympatry
Alleles
Fabaceae
Gene Frequency
Genes, Plant
Isoenzymes
Plants, Medicinal
Variation (Genetics)
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00166707_v109_n3_p255_Bessega
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00166707_v109_n3_p255_Bessega
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spelling todo:paper_00166707_v109_n3_p255_Bessega2023-10-03T14:14:12Z Unexpected low genetic differentiation among allopatric species of section Algarobia of Prosopis (Leguminosae) Bessega, C. Ferreyra, L. Vilardi, J.C. Saidman, B.O. Allopatric species Genetic distance Genetic variability Hybridization Isozymes Prosopis allopatry Argentina enzyme electrophoresis genetic similarity genetic variability geographic distribution homozygosity hybridization isoenzyme South America species differentiation sympatry Alleles Fabaceae Gene Frequency Genes, Plant Isoenzymes Plants, Medicinal Variation (Genetics) The Chaqueña Biogeographic Province, in South America, is the main diversity centre of Prosopis. A group of sympatric species of Section Algarobia in this region constitutes a syngameon, characterised by frequent hybridization and introgression. These processes have been postulated as responsible for the low genetic differentiation observed among species within this group. In this study genetic variability and differentiation among geographically isolated species of the same section was analysed through isoenzyme electrophoresis. Variability parameters and fixation indices were estimated to determine the genetic structure of populations. Two Argentinean, P. ruscifolia ('vinal') and P. flexuosa ('algarrobo amarillo'), and one North American species, P. glandulosa (honey mesquite) were studied. All of them showed, similarly to other species of the same section, high genetic variability and exhibit homozygote excess, probably due to population substructure and low rates of selfing. In contrast to our hypothesis, genetic similarity among species is not related to geographic distance. Genetic distances between P. glandulosa and South American species are similar to those observed among species of this subcontinent. The results obtained suggest that the high genetic similarity among the species of the section Algarobia studied is not due to hybridization. Fil:Bessega, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ferreyra, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vilardi, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Saidman, B.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00166707_v109_n3_p255_Bessega
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Allopatric species
Genetic distance
Genetic variability
Hybridization
Isozymes
Prosopis
allopatry
Argentina
enzyme electrophoresis
genetic similarity
genetic variability
geographic distribution
homozygosity
hybridization
isoenzyme
South America
species differentiation
sympatry
Alleles
Fabaceae
Gene Frequency
Genes, Plant
Isoenzymes
Plants, Medicinal
Variation (Genetics)
spellingShingle Allopatric species
Genetic distance
Genetic variability
Hybridization
Isozymes
Prosopis
allopatry
Argentina
enzyme electrophoresis
genetic similarity
genetic variability
geographic distribution
homozygosity
hybridization
isoenzyme
South America
species differentiation
sympatry
Alleles
Fabaceae
Gene Frequency
Genes, Plant
Isoenzymes
Plants, Medicinal
Variation (Genetics)
Bessega, C.
Ferreyra, L.
Vilardi, J.C.
Saidman, B.O.
Unexpected low genetic differentiation among allopatric species of section Algarobia of Prosopis (Leguminosae)
topic_facet Allopatric species
Genetic distance
Genetic variability
Hybridization
Isozymes
Prosopis
allopatry
Argentina
enzyme electrophoresis
genetic similarity
genetic variability
geographic distribution
homozygosity
hybridization
isoenzyme
South America
species differentiation
sympatry
Alleles
Fabaceae
Gene Frequency
Genes, Plant
Isoenzymes
Plants, Medicinal
Variation (Genetics)
description The Chaqueña Biogeographic Province, in South America, is the main diversity centre of Prosopis. A group of sympatric species of Section Algarobia in this region constitutes a syngameon, characterised by frequent hybridization and introgression. These processes have been postulated as responsible for the low genetic differentiation observed among species within this group. In this study genetic variability and differentiation among geographically isolated species of the same section was analysed through isoenzyme electrophoresis. Variability parameters and fixation indices were estimated to determine the genetic structure of populations. Two Argentinean, P. ruscifolia ('vinal') and P. flexuosa ('algarrobo amarillo'), and one North American species, P. glandulosa (honey mesquite) were studied. All of them showed, similarly to other species of the same section, high genetic variability and exhibit homozygote excess, probably due to population substructure and low rates of selfing. In contrast to our hypothesis, genetic similarity among species is not related to geographic distance. Genetic distances between P. glandulosa and South American species are similar to those observed among species of this subcontinent. The results obtained suggest that the high genetic similarity among the species of the section Algarobia studied is not due to hybridization.
format JOUR
author Bessega, C.
Ferreyra, L.
Vilardi, J.C.
Saidman, B.O.
author_facet Bessega, C.
Ferreyra, L.
Vilardi, J.C.
Saidman, B.O.
author_sort Bessega, C.
title Unexpected low genetic differentiation among allopatric species of section Algarobia of Prosopis (Leguminosae)
title_short Unexpected low genetic differentiation among allopatric species of section Algarobia of Prosopis (Leguminosae)
title_full Unexpected low genetic differentiation among allopatric species of section Algarobia of Prosopis (Leguminosae)
title_fullStr Unexpected low genetic differentiation among allopatric species of section Algarobia of Prosopis (Leguminosae)
title_full_unstemmed Unexpected low genetic differentiation among allopatric species of section Algarobia of Prosopis (Leguminosae)
title_sort unexpected low genetic differentiation among allopatric species of section algarobia of prosopis (leguminosae)
url http://hdl.handle.net/20.500.12110/paper_00166707_v109_n3_p255_Bessega
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AT ferreyral unexpectedlowgeneticdifferentiationamongallopatricspeciesofsectionalgarobiaofprosopisleguminosae
AT vilardijc unexpectedlowgeneticdifferentiationamongallopatricspeciesofsectionalgarobiaofprosopisleguminosae
AT saidmanbo unexpectedlowgeneticdifferentiationamongallopatricspeciesofsectionalgarobiaofprosopisleguminosae
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