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Articles by Zeki AYTAC
Total Records ( 6 ) for Zeki AYTAC
  Mehtap Teksen and Zeki Aytac
  The revision of Fritillaria L. (Liliaceae) genera spread in the regions of Turkey, except the Mediterranean region was conducted in this study. The members of Fritillaria genera, represented with a total of 26 taxa consisting of species and subspecies spread in the flora of Turkey except the Mediterranean region were evaluated in 24 taxa (22 species and 2 subspecies). The diagnosis key, descriptions, distributions and drawings are supplied in this study. The danger categories of the endemic Fritillaria taxa were rearranged according to the new IUCN categories.
  Nur M. PINAR , Murat EKICI , Zeki AYTAC , Hasan AKAN , Talip CETER and Senol ALAN
  The pollen morphology of 45 specimens of 29 species of the genus Astragalus L. of the section Onobrychoidei DC. distributed in Turkey was studied with light and electron microscopies. The pollen is generally 3-colporate. Pollen of the section is prolate, subprolate, and prolate-spheroidal. Size varies, with the polar axis ranging from 23.4 to 42.6 µm and the equatorial axis from 14.3 to 36.4 µm. The outline is elliptic or compressed oval in the meridional section, versus trilobulate and sometimes tetralobulate in the polar optical section. Sculpturing is usually microreticulate, rarely reticulate or rugulate in the meridional optical section, and psilate and perforate (with irregular or circular perforations) in the polar optical section.
  Zeki Aytac and Hayri Duman
  Reseda globulosa Fisch. & C.A.Mey. (Resedaceae) is reported as a new record for Turkish flora. It was identified using the collected specimens and Flora Palaestina. The description, illustration, and distribution of the species are given.
  Esra MARTIN , Hasan AKAN , Murat EKICI and Zeki AYTAC
  This study describes the karyotypes of 10 Turkish species of Trigonella L. belonging to section Cylindricae Boiss. (Leguminosae). Excluding the karyotypes of T. velutina Boiss. and of T. sibthorpii Boiss., which were previously studied, all of the other 8 species were studied here for the first time. The species of the section were gathered from different localities in Turkey, and it was determined that the somatic chromosome numbers for all species were the same (2n = 16). Also, satellite metaphase chromosomes were determined in T. velutina and T. strangulata.
  Mehtap TEKSEN , Zeki AYTAC and Nur Munevver PINAR
  Pollen grains of 39 taxa of the genus Fritillaria L. in Turkey were examined by light and scanning electron microscopy. Detailed pollen morphological characteristics are given for these taxa. Our investigation shows that the sculpturing of the exine provides valuable characters for separating species. In particular, sculpturing of the exine at the proximal face turned out to be taxonomically important. Six types of ornamentation were determined: reticulate, reticulate-perforate, suprareticulate, rugulate-reticulate, psilate-perforate, and perforate. On the basis of exine sculpturing, the sulcus membrane, and the apex sulcus, 5 main pollen types are recognised.
  Mehtap TEKSEN and Zeki AYTAC
  This paper presents a systematic revision of Fritillaria L. (Liliaceae) in the Mediterranean region of Turkey. The genus used to contain 22 taxa in the Mediterranean region, but in this study it has been evaluated on the basis of 23 taxa. We concluded that F. armena Boiss. and F. zagrica Stapf are synonyms of F. pinardii Boiss. Phylogenetic orders of F. forbesii Rix and F. kittaniae Sorger in the Flora of Turkey were changed. F. crassifolia Boiss. & Huet. subsp. crassifolia was suggested as an Irano-Turanian element. Red list categories of endemic taxa of Mediterranean Fritillaria were revised according to IUCN Red List Categories.
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