Ph.D. Tezi Görüntüleme | |||||||||||||||||||||
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| Summary: In this study, distributed in the East Black Sea Region, 28 Cirsium Miller taxa belonging to 45 populations and one doubtful hybrid were examined in terms of morphology and cytotaxonomy. Plant materials were collected from Giresun, Trabzon, Gümüshane, Bayburt, Rize and Artvin in the periods of their vegetation between 2005 and 2009. The collected plants stored as herbarium specimens. Morphological studies were carried out from herbarium specimens, and karyological investigations were performed on permanent slides prepared from actively growing root tips.As a result of morphological investigations, a new identification key was prepared for Cirsium taxa distributed in the study area. New square records for C. macrobotrys, C. lappaceum subsp. anatolicum and C. pubigerum var. caniforme were recorded in studied area and one doubtful hybrid recorded from Rize in Flora of Turkey was collected and illustrated morphologically. The chromosome numbers of the studied taxa have been determined as 2n=32, 34, 36, 60, and 68 respectively. Moreover, B chromosome was found in C. lappaceum subsp. lappaceum and C. pubigerum var. glomeratum. Nineteen chromosome counts are new to science and all counts were reported for the first time from Turkey. It was detected that the taxa had generally small chromosomes. Karyotypes analyses of 23 populations, belonging to 18 taxa that their centromere positions can be seen under light microscopy were also carried out. It was observed that the karyologically investigated taxa consist of median, submedian and subterminal centromered chromosomes, and have fairly symmetric karyotypes.Key Words: Cirsium, Asteraceae, Cytotaxonomy, Chromosome Number, Karyotype, Hybrid | |||||||||||||||||||||