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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Population genetics of Mediterranean and Saharan olives: Geographic patterns of differentiation and evidence for early generations of admixture
Annals of Botany, Volume 112, No. 7, Year 2013
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Description
Background and Aims The olive (Olea europaea subsp. europaea)was domesticated in the Mediterranean area but its wild relatives are distributed over three continents, from the Mediterranean basin to South Africa and southwestern Asia. Recent studies suggested that this crop originated in the Levant while a secondary diversification occurred inmostwestward areas.Apossible contribution of the Saharan subspecies (subsp. laperrinei) has been highlighted, but the data availablewere too limited to drawdefinite conclusions. Here, patterns of genetic differentiation in the Mediterranean and Saharan olives are analysed to test for recent admixture between these taxa. Methods Nuclear microsatellite and plastid DNA (ptDNA) data were compiled from previous studies and completed for a sample of 470 cultivars, 390 wild Mediterranean trees and 270 Saharan olives. A network was reconstructed for the ptDNA haplotypes, while a Bayesian clustering method was applied to identify the main gene pools in the data set and then simulate and test for early generations of admixture between Mediterranean and Saharan olives. Key Results Four lineages of ptDNA haplotypes are recognized: three from the Mediterranean basin and one from the Sahara. Only one haplotype, primarily distributed in the Sahara, is shared between laperrinei and europaea. This haplotype is detected once in 'Dhokar', a cultivar from the Maghreb. Nuclear microsatellites show geographic patterns of genetic differentiation in the Mediterranean olive that reflect the primary origins of cultivars in the Levant, and indicate a high genetic differentiation between europaea and laperrinei. No first-generation hybrid between europaea and laperrinei is detected, but recent, reciprocal admixture between Mediterranean and Saharan subspecies is found in a few accessions, including 'Dhokar'. Conclusions This study reports for the first time admixture between Mediterranean and Saharan olives. Although its contribution remains limited, Laperrine's olive has been involved in the diversification of cultivated olives. © The Author 2013.
Available Materials
https://efashare.b-cdn.net/share/pmc/articles/PMC3806528/bin/supp_112_7_1293__index.html
https://efashare.b-cdn.net/share/pmc/articles/PMC3806528/bin/supp_mct196_mct196supp.pdf
Authors & Co-Authors
Besnard, Guillaume
France, Toulouse
Laboratoire Évolution et Diversité Biologique
Bakkali, Ahmed El
France, Montpellier
Amélioration Génétique et Adaptation Des Plantes Méditerranéennes et Tropicales Agap
Morocco, Rabat
Institut National de la Recherche Agronomique, Morocco
Haouane, Hicham
France, Montpellier
Amélioration Génétique et Adaptation Des Plantes Méditerranéennes et Tropicales Agap
Baâli-Cherif, Djamel
Algeria, Algiers
Institut Nationale de la Recherche Agronomique D'algérie Inraa
Moukhli, Abdelmajid
Morocco, Rabat
Institut National de la Recherche Agronomique, Morocco
Khadari, Bouchaïb
France, Montpellier
Amélioration Génétique et Adaptation Des Plantes Méditerranéennes et Tropicales Agap
Statistics
Citations: 64
Authors: 6
Affiliations: 4
Identifiers
Doi:
10.1093/aob/mct196
ISSN:
03057364
Research Areas
Cancer
Genetics And Genomics
Study Design
Cross Sectional Study
Study Locations
South Africa