Combination of chloroplast and mitochondrial DNA polymorphisms to study cytoplasm genetic differentiation in the olive complex ( Olea europaea L.).

摘要: Four hundred and four individuals belonging to the species Olea europaea were characterised using mitochondrial DNA (mtDNA) RFLPs. Twelve mitotypes distinguished. The combination of mtDNA information with cpDNA polymorphism (characterised in a previous study) led us recognise 20 cytoplasmic lineages which seven found Mediterranean area (oleasters, cultivars O. e. subsp. maroccana). In olive complex, strong cytoplasm genetic differentiation was revealed (F st = 0.73). Very linkage disequilibrium between polymorphisms observed, particularly subspecies europaea. This high congruence structure based on or sustains low level recurrent mutation both organelle DNAs and, thus, used this study pertinent reconstruct phylogeography. area, drift due population regression during Quaternary glaciations, founder effects associated postglacial seed dissemination, have probably contributed existence polymorphisms. Thus, lineages, clearly distinguished by polymorphisms, most likely reflect distinct relic populations glaciations. Finally, maroccana from South Morocco, also displayed specific should be considered as another population.