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Öğe Effect of stratification, temperature and storage on germination in three provenances of Fraxinus angustifolia subsp. oxycarpa seeds(2005) Tilki, Fahrettin; Çiçek, EmrahTürkiye'de üç ana yayılış alanından temin edilen Fraxinus angustifolia subsp. oxycarpa tohumlarının çimlenme potansiyelleri üzerine katlama işlemi, saklama ve sıcaklığın etkisi incelenmiştir. Araştırmanın birinci safhasında; tohumların bir bölümü soğuk katlama ve sıcak katlama + soğuk katlama şeklinde 9 farklı ön işleme tabi tutulmuştur. Bu işlemleri takiben 30/20 °C'de yapılan çimlendirme denemelerinde, çimlenme yüzdesi (GP) ve çimlenme değerinin (GV) oryin ve işlem tarafından önemli oranda etkilendiği belirlenmiştir. Üç orijinin ortalaması alındığında en yüksek çimlenme parametreleri; 16 hafta soğuk katlama (GP = 40.0, GV = 3.8), 4 hafta sıcak + 4 hafta soğuk katlama (GP = 43.7, GV = 4.2) ve 4 hafta sıcak + 8 hafta soğuk katlama (GP = 45.8, GV = 4.3) işlemleri sonucunda elde edilmiştir. Araştırmanın ikinci safhasında; çimlenme engeli 4 hafta sıcak + 4 hafta soğuk katlama sonucu giderilen tohumlar +4 °C ve -5 °C'de 12 ay süre ile saklanmıştır. Bu işlem sonucu; +4 °C'de saklanan tohumlarda saklama süresince ön çimlenme görülmüştür. -5 °C de saklanan tohumların ise saklamayı takiben çimlenme değerlerinde az bir düşüş belirlenmekle birlikte, çimlenme yüzdelerinde istatistiksel anlamda bir düşüş tespit edilmemiştir. Araştırmanın üçüncü safhasında; ön işleme tabi tutulmayan tohumlar -5 °C ve +4 °C'de 12 ay saklandıktan sonra 4 hafta sıcak + 4 hafta soğuk katlama işlemini takiben üç farklı sıcaklıkta (30/20 °C, 20 °C ve 25/4 °C) çimlendirilmiştir. Çimlendirme sonucunda; saklamanın her üç orijinde de çimlenme performansını etkilemediği fakat çimlendirme sıcaklığının önemli etkisinin olduğu tespit edilmiştir. En yüksek çimlenme parametreleri 25/4 °C'de yapılan çimlendirme denemeleri sonucu (GP = 60.8, GV = 6.6) elde edilmiştir.Öğe Effects of stratification, temperature and storage on germination in three provenances of Fraxinus angustifolia subsp. oxycarpa seeds(Turkiye Klinikleri Journal of Medical Sciences, 2005) Tilki, Fahrettin; Çiçek, EmrahThe effects of stratification, temperature and storage on seed germination performance were investigated in 3 provenances of Fraxinus angustifolia subsp. oxycarpa seeds. In the first study, seeds were subjected to 9 different periods of cold stratification or warm stratification followed by cold stratification to overcome dormancy. Stratification and provenances affected seed germination percentage (GP) and germination value (GV) when seeds were germinated in darkness at 30/ 20 °C. Sixteen weeks' cold stratification (GP = 40.0, GV = 3.8), 4 weeks' warm stratification + 4 weeks' cold stratification (GP = 43.7. GV = 4.2) and 4 weeks' warm stratification + 8 weeks' cold stratification (GP = 45.8. GV = 4.3) were the most efficient in promoting germination performance, as well as dormancy removal. In the second study, the effects of storage at +4 °C and -5 °C for 12 months on the quality of pretreated seeds were investigated. Seeds from each provenance stored at + 4°C were germinated during storage, while seeds stored at -5 °C had high germination parameters after storage. In the third study, dormant seeds stored at -5 °C and +4 °C for 12 months were subjected to stratification (4 weeks of warm + 4 weeks of cold stratification) and then germinated at 30/20 °C, 20 °C and 25/4 °C. Germination performance was not reduced by storage temperature in any provenances but was significantly affected by germination temperature, and the 25/4 °C regime always gave the highest germination parameters (GP = 60.8, GV = 6.6). © Tübi?tak.Öğe Effects of temperature, light and storage on seed germination of Ulmus glabra Huds. and U. laevis Pall(2006) Çiçek, Emrah; Tilki, FahrettinThe effects of temperature, light and storage on the germination of Ulmus glabra and Ulmus laevis seeds were studied. Germination tests were carried out under constant temperatures of 20°C and alternating temperatures of 30/20°C. Temperature significantly affected seed germination of U. glabra not stored, and seed germination was the highest at 30/20°C under dark or light. Temperature and light (0 or 8 h) did not significantly affect germination of U. laevis seeds not stored. When seeds were stored for 2 years, seed germination of U. glabra and U. laevis was significantly affected by temperature and light (0, 8, 16 and 24 h). Two years storage of U. glabra seeds increased light demands for germination percentage, and the seeds could be stored at 4°C for 2 years without losing its viabilities when germinated at 30/20°C under light. Although germination percentage and germination rate of U. laevis seeds reduced after 2 years of storage, germination parameters were still quite high when seeds were germinated at 30/20°C under light. © 2006 Asian Network for Scientific Information.Öğe Field performance of narrow-leaved ash (Fraxinus angustifolia Vahl.) rooted cuttings and seedlings(2006) Çiçek, Emrah; Tilki, Fahrettin; Çiçek, NurtenOutplanting performance of 1-year-old narrow leaved ash stocks (rooted cuttings and seedlings) grouped into three height categories (large, medium and small) were examined in a bottomland site with heavy clay soils. Stock type and stock size factors were not a significant predictor of survival of seedlings and rooted cuttings at the end of the first year in the field. The overall first-year outplanting survival of the 1+0 seedlings and rooted cuttings was 100% for all treatments. Stock type significantly affected first year diameter and height growth rate after planting and both diameter and height growth were higher in rooted cuttings (4.5 mm and 51.6 cm, respectively) than seedlings (2.8 mm and 27.0 cm, respectively) average for three stock sizes. Stock sizes had no significant affect on seedling diameter and shoot growth in both stock types. Large size rooted cutting-propagated narrow-leaved ash can provide significant advantages on seedlings and small size rooted cuttings on bottomland sites. © 2006 Asian Network for Scientific Information.Öğe Seed germination of three Ulmus species from Turkey as influenced by temperature and light(Triveni Enterprises, 2007) Çiçek, Emrah; Tilki, FahrettinThe effect of temperature and light on the germination performance of Ulmus minor, Ulmus glabra and Ulmus laevis were studied in this research.Seeds were germinated under constant temperatures of 20 and 25 degrees C and alternating temperatures of 25/ and 30/20 degrees C. Within each temperature regime, seeds were subjected daily to the following photoperiods: total darkness and 8 hr photoperiod. Temperature and light affected seed germination percentage (GP) and germination rate expressed as peak value (PV) in Ulmus minor and 25 and 30/20 degrees C under light gave the highest GP (>95%) and PV(>23), The temperatures of 25/15 and 30/20 degrees C gave the highest GP (>89%) in Ulmus glabra and light did not significantly affect GP But the highest PV in Ulmus glabra was found at these temperatures under light. Germination percentage of Ulmus laevis was not affected by temperature and light, but the alternating temperature of 30/20 degrees C produced the highest germination rate under darkness.Öğe Survival and growth of three hardwood species (Fraxinus angustifolia, Ulmus laevis and U. minor) on a bottomland site with heavy clay soil(Academic Journals Inc., 2007) Çiçek, Emrah; Tilki, Fahrettin; Kulaç, Şemsettin; Yılmaz, Murat; Yılmaz, FarukSeedlings of Fraxinus angustifolia Vahl., Ulmus laevis Pall. and U. minor Mill. were grown in nursery for this study. The one-year old bareroot planting stocks so produced were out-planted on the bottomland site with heavy clay soils and 360 seedlings per species was assessed two years after planting for diameter, height and survival. Significant differences were found among species in survival, diameter and height. Fraxinus angustifolia and U. laevis had excellent survival (100%) and survival was lower in U. minor (92%). Ulmus laevis had the greatest height increment (128.3 cm) and total height (187.5 cm) followed by U. minor. Fraxinus angustifolia had the lowest height increment (76.4 cm) and total height (147.2 cm). Diameter increment was also different among species and U. laevis had the greatest diameter increment (15.1 mm) and there were not significant differences among U. minor and F. angustifolia. It might be concluded that the overall survival and growth of the species were high enough on this bottomland site with heavy clay soils although there were significant differences among the species in survival and growth. © 2007 Academic Journals.
