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    In vitro screening for antioxidant and antimicrobial properties of five commercial Origanum species from Turkey
    (Natl Inst Science Communication-Niscair, 2017) Taskin, Turgut; Sadikoglu, Narin; Birteksoz-Tan, Seher; Bitis, Leyla
    The present study was conducted to evaluate the antioxidant and antimicrobial properties of methanol extracts of the five Origanum species, which are commercial importance in Turkey. Antioxidant activity was measured employing three methods namely, DPPH free radical scavenging activity, ABTS(+) radical cation scavenging activity and ferric reducing antioxidant/power activity, including total phenolic and total flavonoid contents. In addition, antimicrobial activities of methanol extracts from five Origanum species aerial parts were investigated against Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Proteus mirabilis and Candida albicans test organisms using the disk diffusion and microdilution methods. Antioxidant studies suggested that methanol extracts behaved as a strong DPPH free radical, ABTS radical cation scavenging activity and ferric reducing antioxidant/power activity. The antimicrobial test results showed that the methanol extracts of all Origanum species had great potential of antibacterial activity against Staphylococcus aureus. As a conclusion of this study, the methanol extracts of five Origanum species showed strong antioxidant and antibacterial activity and therefore, they can be used as a natural preservative ingredient in food and/or pharmaceutical industry.
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    Molecular genetic diversity in the Origanum genus: EST-SSR and SRAP marker analyses of the 22 species in eight sections that naturally occur in Turkey
    (Elsevier Science Bv, 2018) Tascioglu, Tulin; Sadikoglu, Narin; Doganlar, Sami; Frary, Anne
    Origanum (L.) is a genus of herbaceous perennials with culinary and medicinal uses with many species found in the Mediterranean region. The taxonomic classification of species belonging to this genus has been studied using morphological, biochemical and genetic diversity analyses. In this study, the genetic diversity of 22 Turkish Origanum species (including 24 taxa from eight sections) was examined with 46 herbarium specimens from the Mediterranean, Eastern Anatolian, Central Anatolian, and Black Sea regions of Turkey. Molecular marker data were generated from 25 SRAP primer pairs and six EST-SSR primers which produced 325 alleles. Dendrogram, principal coordinate and population structure analyses revealed the relationships among Origanum sections, species and individuals. Gene flow (PhiPT and Nm) was also studied for a deeper understanding of the relationships and hybridization patterns between sections and species. Molecular separation of the Origanums roughly corresponded to the taxonomy that Ietswaart proposed in 1980 but also suggested that hybridization among sections and species may result in convergence and/or divergence of different sections and species.
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    Morphological characteristics of exported taxa as Oregano from Turkey I: Origanum
    (Istanbul Univ, Fac Pharmacy, 2015) Sadikoglu, Narin; Ozhatay, Neriman
    Oregano is a collective name of a group of taxa have been used as spice and known as Turkish Kekik. Different genera and species of the family Labiatae containing timol and carvacrol are being used as oregano. It is determined that 9 taxa are being exported as oregano. They are: Origanum minutiflorum O. Schwarz & P.H. Davis, O. majorana L., O. onites L., O. syriacum L. ssp. bevanii (Holmes) Greuter & Burdet, O. vulgare L. ssp. hirtum (Link) Ietsw., Satureja thymbra L., S. cuneifolia Ten., Coridothymus capitatus (L.) Rchb. f., Thymbra spicata L. ssp. spicata. In this paper outer and inner morphological characteristics of exported only Origanum taxa are given with its description, illustration and distribution.