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  • Küçük Resim
    Öğe
    Pollen morphology of some Allium L. taxa (sect. Codonoprasum/Alliaceae) in Turkey
    (Istanbul Univ, Fac Pharmacy, 2014) Kocyigit, Mine; Odabaşı, Nevin Şafak
    The genus Allium L. is represented by about 196 taxa grouped under 14 sections in Turkey. The sect. Codonoprasum consists of 49, of which 21 are endemics. In this study pollen morphological features of 12 taxa belonging to Sect. Codonoprasum have been demonstrated using Wodehouse (1935) method and with Light Microscope (LM). Detailed pollen morphological characteristics of genus Allium are given on the basis of the results presented. The genus Allium is homogeneous in both aperture type and exine ornamentation. The pollen of the genus is monocolpate. The shapes (based on Long Axis / Short Axis) are prolate and subprolate. The colpus extends from distal to proximal side in all taxa. The colpus membrane is provided with a fragmented operculum in the sect. Codonoprasum.
  • Küçük Resim
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    Taxonomic remarks on the genus Sternbergia L. (Amaryllidaceae) in Turkey based on leaf anatomy, karyosystematic analysis and nuclear DNA content
    (Magnolia Press, 2016) Kocyigit, Mine; Tuna, Metin
    Anatomy of leaf cross sections, karyological studies, and nuclear DNA content analysis by flow cytometry were carried out on the six Sternbergia species from Turkey: S. candida (endemic to the country), S. clusiana, S. colchiciflora, S. lutea, S. sicula and S. vernalis. In karyological analysis, number and morphology of the somatic chromosomes, the ploidy level and karyotype formula of the specimens used in the study were investigated in detail. The measurements of somatic chromosomes were calculated with formula of the relative variation in chromosome lenght (CV CL) and mean centromeric asymmetry (M CA). According to the results of this study, there are two different basic chromosome numbers. i.e. x = 10 (S. candida, S. clusiana, S. colchiciflora and S. vernalis) and x = 11 (S. lutea and S. sicula). Results of karyotype analysis corroborated results of previous studies. The smallest chromosome length was measured as 3.05 mu m in S. clusiana while the longest length of 20.89 mu m was observed in S. sicula. This is the first study reporting nuclear DNA content results for Sternbergia. Based on results of the nuclear DNA content analysis, there is a great variation within the genus in the interspecific level as 2C DNA content varies between 54.03 and 80.42 pg among the species investigated in the study. Anatomical features of the leaves were good taxonomic markers, especially concerning their palisade cells, ribs, cuticle, laticifer canals, vascular bundles, crystals, stomatal index, and stomata structure. Analytical drawings were presented. Six noteworthy leaf characters were quantified, organized in a data matrix, and analysed with UPGMA methods. In conclusion, cytological characteristics of the Sternbergia species together with their leaf features proved to be quite useful in identification and therefore can provide more clarity for taxonomic revision of the genus.