title: Cultivar origin and admixture detection in Turkish olive oils by SNP-based CAPS assays.
abstract: The aim of this study was to establish a DNA-based identification key to ascertain the cultivar origin of Turkish monovarietal olive oils. To reach this aim, we sequenced short fragments from five olive genes for SNP (single nucleotide polymorphism) identification and developed CAPS (cleaved amplified polymorphic DNA) assays for SNPs that alter restriction enzyme recognition motifs. When applied on the oils of 17 olive cultivars, a maximum of five CAPS assays were necessary to discriminate the varietal origin of the samples. We also tested the efficiency and limit of our approach for detecting olive oil admixtures. As a result of the analysis, we were able to detect admixing down to a limit of 20%. The SNP-based CAPS assays developed in this work can be used for testing and verification of the authenticity of Turkish monovarietal olive oils, for olive tree certification, and in germplasm characterization and preservation studies.
authors: Department of Molecular Biology & Genetics, Izmir Institute of Technology , Urla, Izmir 35430, Turkey.
authors: Ali Tevfik
authors: AT
authors: Uncu
authors: Anne
authors: A
authors: Frary
authors: Sami
authors: S
authors: Doganlar
mesh_terms: D054458:Amplified Fragment Length Polymorphism Analysis / Q000379:methods*; D018744:DNA, Plant / Q000235:genetics; D016002:Discriminant Analysis; D031658:Olea / Q000737:chemistry / Q000145:classification / Q000235:genetics*; D000069463:Olive Oil; D010938:Plant Oils / Q000737:chemistry* / Q000145:classification; D020641:Polymorphism, Single Nucleotide; D014421:Turkey
chemical_list: D018744:DNA, Plant; D000069463:Olive Oil; D010938:Plant Oils
keywords: Olea europaea L.; food authentication; molecular markers; monovarietal olive oil; traceability