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Öğe Determination of ploidy levels in Ipheion uniflorum (R. C.!Graham) Rafin (Liliaceae)(Akademiai Kiado, 2005) Meric, C; Dane, FIn this study, chromosome number and ploidy levels of Ipheion uniflorum cv. Wisley Blue (spring starflower) were determined. In meristematic root tip cells, chromosome number was found as 2n = 12 and 4n = 24. The ratios of diploid and tetraploid cells were found as 80.74% and 19.26%, respectively. In differentiated root tissues and mature leaf tissues ploidy levels were analysed by flow cytometry and polysomaty were found in both organs. In differentiated root tissues, ploidy levels were found as 2C, 4C, 8C and 16C DNA. In root tissues percentages of 2C, 4C, 8C and 16C nuclear DNA content were observed as 57.2%, 33.1%, 2.47% and 7.23%, respectively. In mature leaf tissues, ploidy levels were determined 2C, 4C, 8C and 16C DNA. In this tissue the frequency of 4C DNA was found very higher (74.3%) and 2C DNA content was determined as 19.2%. In mature leaf tissue, 8C and 16C nuclear DNA contents were observed as 2.72% and 3.78%, respectively. When nuclear DNA contents in leaves and roots were compared, an apparent difference in 2C and 4C DNA contents was found.Öğe The effects of fungicide benomyl (benlate) on growth and mitosis in onion (Allium cepa L.) root apical meristem(Akademiai Kiado, 2005) Dane, F; Dalgiç, ÖIn this study, the effects of benomyl, a systemic fungicide were investigated in the mitotic cell division in onion (Allium cepa) root tip cells during germination. For this aim, different concentrations (1, 2, 5, 10 and 20 mM) of benomyl solutions were used. All the concentrations used caused several abnormalities in mitotic cell divisions and the mitotic frequency in the onion root tip cells decreased as the concentration of benomyl solution increased. Based on our findings, it is reported that benomyl has some negative effects on mitotic divisions in onion root tip cells.Öğe Polarity during sporogenesis and gametogenesis in plants(Versita, 2004) Ekici, N; Dane, FIn this article the importance of polarity during sporogenesis and gametogenesis in plants is discussed. Polarity is one of the important] processes during cell differentiation. Many studies have been done about this subject but it does not become clear how or why polarity is taken place during cell differentiation. The aim of this article is to bring together the knowledge about polarity from the past and recently done studies.
