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Articles by Tuncay DIRMENCI
Total Records ( 7 ) for Tuncay DIRMENCI
  Esra Martin , Ahmet Duran and Tuncay DIrmencI
  In this research, the chromosome number and morphology of M. trojana species are determined. Somatic chromosome number was counted as 2n = 12. The karyotype of this species consisted of four metacentric chromosome pairs and two submetacentric chromosomes. Chromosome length varies between 2.44-4.27 μm. The karyogram and idiogram were determined based on centromeric index and arranged in the decreasing size order.
  Ayla KAYA and Tuncay DIRMENCI
  Nutlet characters within the genus Nepeta L. are of taxonomic significance. In this study, the nutlet morphology of 39 taxa of Turkish Nepeta species was examined using both stereoscopic and scanning electron microscopy (SEM). According to surface ornamentations, 3 main types, smooth, partly smooth, and sculptured, and 7 subtypes, undulate-ridged, cellular, reticulate, protuberance, papillate, verrucate, and tuberculate, were defined and illustrated. In addition, the unknown nutlet features of N. conferta Hedge & Lamond, N. crinita Montbret & Aucher ex Bentham, and N. viscida Boiss. are given for the first time here in detail. It is clear that external nutlet characters, especially surface texture, could help in the classification of the species of the complex genus Nepeta in the future.
  Tuncay Dirmenci , Bayram Yildizz , Ian C. Hedge and Mehmet Firat
  The genus Lophanthus Adans. is recorded for the first time from Turkey. Specimens collected from Van province, east Anatolia, are described here as the new species Lophanthus turcicus Dirmenci, Yildiz & Hedge. Diagnostic characteristics that distinguish it from allied species are presented; a description, distribution map, and taxonomic comments are given.
  Tuncay DIRMENCI , Ekrem DUNDAR , Gorkem DENIİZ , Turan ARABACI , Esra MARTIN and Ziba JAMZAD
  The genus Cyclotrichium, a member of the tribe Mentheae subtribe Menthinae (Lamiaceae, Nepetoideae), was analysed with respect to morphological revision, phylogenetic analysis, and cytogenetic properties. All species of the genus were investigated for morphological characters and ITS (internal transcribed spacers) of nrDNA sequence comparison (except C. hausknechtii for ITS). Six members of the genus were also analysed for chromosome numbers. The combined results strongly suggested that Cyclotrichium is a separate genus in Nepetoideae with distinct morphological, phylogenetic, and cytogenetic characteristics. For intrageneric phylogeny of Cyclotrichium, 3 groups were recognised: 1. C. niveum; 2. C. origanifolium; and 3. the remaining 6 species. Clinopodium s.l. and Mentha appear to be most closely related to Cyclotrichium. The phylogenetic relationship of Cyclotrichium with Clinopodium s.l., Mentha, Micromeria, Melissa, and Satureja is discussed. This is the first report on the somatic chromosome numbers of 6 Cyclotrichium species and phylogenetic analysis of Cyclotrichium based on (nrDNA) ITS sequences.
  Turan ARABACI , Tuncay DIRMENCI and Ferhat CELEP
  As an initial part of a revisional study based on the genus Micromeria Benth. (Lamiaceae), extensive field studies, herbarium and literature surveys, and multivariate analysis have been conducted. Recently, many morphological and molecular studies have been conducted on the genus Micromeria and related genera. Consequently, the generic boundaries of Micromeria have dramatically changed. Therefore, a morphometric analysis was carried out on Turkish Micromeria s.l. species, belonging to sect. Micromeria, sect. Cymularia Boiss., and sect. Pseudomelissa Benth., 2 Clinopodium L. species, and 2 Mentha L. species in order to understand their taxonomic relationship. For morphometric analysis, 27 morphological characters and their states were investigated by means of MVSP software. Our results supported previous molecular studies. The members of the sect. Pseudomelissa should be transferred to the genus Clinopodium. Turkish Micromeria species are now represented by 8 species belonging to sect. Micromeria and sect. Cymularia. In addition, the taxonomic position of Micromeria cymuligera Boiss. & Hausskn. (sect. Cymularia) is discussed. The most important diagnostic characters of the Micromeria species such as leaf and calyx are illustrated.
  Esra MARTIN , Ozlem CETIN , Ekrem AKCICEK and Tuncay DIRMENCI
  Somatic chromosome numbers of 26 Stachys L. taxa (14 species, 11 subspecies, and 1 varietas), collected from different localities in Turkey, were counted for the first time, except for Stachys byzantina C.Koch and S. thirkei C.Koch. In this study, all of the Stachys taxa determined were somatic with chromosome numbers counted as 2n = 30. This research has made a contribution to the taxonomic revision of the genus Stachys in Turkey.
  Ekrem AKCICEK , Tuncay DIRMENCI and Ekrem DUNDAR
  As a part of a revisional study of Stachys L. sect. Eriostomum (Hoffmanns. & Link) Dumort. (Lamiaceae), 4 taxa [S. tymphaea Hausskn., S. thracica Davidov, S. cretica L. subsp. cretica, and S. cretica L. subsp. salviifolia (Ten.) Rech.f.] were recorded for the first time from Turkey. S. cretica subsp. trapezuntica Rech.f., which was described based on 3 syntypes [Bourgeau 695; Sintenis 3432 (designated here as the lectotype); Handel-Mazzetti 324] near Trabzon, had not been collected again since 1907. It was found in 2 syntype localities from Trabzon in 2010 during this study, for the first time in 103 years. For 2 taxa, the categories of other authors were accepted, as opposed to those in Flora of Turkey: S. germanica L. subsp. bithynica (Boiss.) R.Bhattacharjee (a subspecies) was replaced with S. bithynica Boiss. as a species, and S. balansae Boiss. & Kotschy subsp. carduchorum R.Bhattacharjee (a subspecies) was replaced with S. carduchorum (R.Bhattacharjee) Rech.f. as a species. In one taxon, the category of Haussknecht was accepted: S. tymphaea Hausskn. The status of S. libanotica Benth. var. minor Boiss. was changed to S. minor (Boiss.) Akcicek & Dirmenci comb. et stat. nov. One species (S. ehrenbergii Boiss.) was removed from the flora of Turkey because it was mistakenly reported to grow in Turkey. Descriptions, diagnostic characters, detailed illustrations, distribution maps, and taxonomic comments for these taxa are presented. A phylogenetic analysis using the ITS of the nuclear ribosomal DNA of the examined taxa further confirmed the rearrangements suggested.
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