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    Anatomical, palynological and karyological remarks of Silene brevicalyx and Silene ozyurtii (Caryophyllaceae)
    (Magnolia Press, 2016) Atasagun, Bayram; Aksoy, Ahmet; Martin, Esra
    Anatomical, palynological, karyological and morphological seed characters of Silene brevicalyx and S. ozyurtii ( Caryophyllaceae) were investigated for the first time. S. brevicalyx grows on serpentine rocky slopes and open forest in Mugla province (southwestern Turkey), while S. ozyurtii is an East Mediterranean element growing on serpentine stony slopes and again open forest. Anatomically, cross-section of root of both species have a periderm as the protective tissue at the outermost layer and locally druse crystals are encountered in cortex layer. Stems have a thick well-developed sclerenchyma layer. The walls of outward sclerenchyma cells are wider than the walls of inward cells. Leaves are equifacial. Pollen are prolate-spheroidal, symmetry radially, polarity apolar, with aperture periporate, ornamentation microechinate-perforate. Seeds of both species are reniform, with surface concave and granulation coarse-medium, hylar zone recessed, dark-brown or fuscous coloured. Somatic chromosome numbers of 2n = 24 were found for both taxa. The karyotypes are analyzed for the first time for S. brevicalyx and S. ozyurtii. Ideograms of these taxa were drawn by use of an Image Analysis System.
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    Contribution to the systematic knowledge of Lamium multifidum and L-orientale (Lamiaceae)
    (Magnolia Press, 2015) Atasagun, Bayram; Aksoy, Ahmet; Martin, Esra
    Some morphological, anatomical, palynological and karyological features of Lamium multifidum and L. orientale (Lamiaceae) naturally occurring in Turkey have been studied. Additional information was added to the previous description of these species. Anatomically, both L. multifidum and L. orientale had an annual taproot, stems quadrangular in cross-section, leaves bifacial. The nutlets were ovoid in outline and trigonous in cross section, blackish-dark brownish, with glabrous surface. The pollen grains of both species were tricolpate, shape subprolate, ornamentation reticulate. In both species, the somatic chromosome number resulted 2n = 14. The anatomical and palynological features, chromosome number and morphological characters of both species were reported for the first time in this study.
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    Identification and classification of Eremogone species using DNA based Schottky diodes
    (Elsevier, 2023) Atasagun, Bayram; Armag, Metin; Tugay, Osman; Ulukus, Deniz; Hussaini, Ali Akbar; Yildirim, Murat
    The revelation of DNA's remarkable conducting characteristics provided a significant boost for the development of DNA-based electronics. These distinguishing characteristics can be used to identify or detect DNA. In this study, it was basically aimed to investigate the possibility of using Schottky barrier diodes in which semiconductor DNA is used as the interface from three endemic Eremogone species distributed in Turkey. We collected Eremogone ali-gulii, Eremogone armeniaca, and Eremogone scariosa endemic species and extracted the DNA via the QIAGEN commercial DNA isolation kit procedure. The DNA samples were deposited by drop casting on the thin film indium tin oxide substrate. Electrical characterization of DNA interlayered heterojunctions was investigated via a solar simulator. Electronic parameters such as ideality factor, barrier height, and series resistance were calculated from I to V characteristics. Electrical properties of DNA samples were investigated and compared to Colchicum triphyllum's DNA which is completely from another genus. The results show that morphologically similar species have similar electrical properties. When compared to Colchicum triphyllum-DNA based device, genus Eremogone-DNA based devices have a lower ideality factor, barrier height, and series resistance. Via this technique, DNA samples can be identified, detected, and classified.
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    Morphological, anatomical, palynological, karyological and autecological characters of Centaurea amaena Boiss. & Balansa [Sect. Phalolepis (Centaurea/Asteraceae)]
    (Springer Wien, 2013) Atasagun, Bayram; Aksoy, Ahmet; Martin, Esra; Uzun, Oguzhan
    Centaurea amaena Boiss. & Balansa included in the Phalolepis section of the Compositae (Asteraceae) family is an endemic species that is under critical risk of extinction. The morphological, anatomical, palynological, karyological and autecological features have been studied in this study. In accordance with the new observations, additional information was added to the previous description of the species, and the description was edited. Moreover, threat category of C. amaena has been updated according to International Union for Conservation of Nature criterions as CR B2ab(i,iii) (previously EN). Pollen grains are symmetric and isopolar, tricolporate. The somatic chromosome number is determined as 2n = 18 in C. amaena. The karyotype formula of this species consists of three median chromosome pairs and six submedian chromosome pairs. The physical and chemical properties of the soil in which the plant grows are, sandy-loam, weak acid, high organic matter.
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    Morphological, anatomical, palynological, karyological and ecological remarks of Astragalus argaeus (Fabaceae) endemic to Turkey
    (Magnolia Press, 2018) Atasagun, Bayram; Aksoy, Ahmet; Martin, Esra
    Astragalus argaeus is a critically endangered endemic species growing only on Erciyes Mountain in Kayseri, Turkey. In this study, morphology, anatomy, ecology, pollen and seed morphology and karyology of this species were investigated. The previous description of the species has been expanded and amended. Anatomically, cross-sections of root, stem and leaflet were investigated for the first time. The pith of the root is exactly covered by xylem tissue. The cross-section of stem has a periderm as the protective tissue at the outermost layer. The leaflets are equifacial (isobilateral) and amphistomatic. The pollen grains are tricolporate, isopolar and radially symmetrical, shape prolate, ornamentation faevolatc-reticulate. The seeds are brownish and dark dotted in colour and oblate in shape, with rugulate-reticulate ornamentation. Number of somatic chromosomes was identified as 2n = 16 in A. argaeus. The karyotype formula of this species consists of three median chromosome pairs and five submedian chromosome pairs. The plant grows in slightly acidic or alkaline soils with loamysand texture, high organic matter and CaCO3 contents.