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This study was carried out to evaluate the effects of different plant growth regulators on the ornamental sunflower plant. The seedlings belonging to Helianthus annuus L. cv. Sunsantion F1 were planted in plastic pots (2 L) containing peat: perlite (1:1, v/v) medium at four true leaf stage. Spray treatments of aminoethoxyvinil glycine (AVG; 250 and 500 ppm), Promalin (5 and 10 ppm), Thidiazuron (TDZ; 5-10 µM), Ethephon (100 ppm) were applied to seedlings 20 days after transfer to the pots, and treatments were repeated 10 days after the first application. Flower life (days), flower diameter (cm), stem diameter (cm) and plant height (cm) were determined. According to statistical analysis, AVG at 250 ppm significantly increased the flower life from 9.17 d in control plants to 11.08 d whereas there were no significant effects on flower diameter and plant height. Both concentrations of Promalin and TDZ increased stem diameter significantly. However, TDZ increased the flower life from 9.17 d (control plants) to 10.36 at 10 µM and 10.33 at 5 µM TDZ. Ethephon application prevented flower bud opening and caused the leaves to be yellowing. These results may suggest AVG and TDZ pre-treatments increase the quality and shelf-life of the potted sunflower plant.

Türkiye'nin doğal şimşir türlerinin özellikle şimşir güvesi (Cydalima perspectalis) tehdidi altındaki mevcut durumu ve son lokasyonları ilk kez ülke genelinde detaylı olarak araştırılmıştır. Çalışmalar kapsamında bölge ve illerdeki mevcut şimşir mevcudiyetinin son durumunun tespiti için detaylı arazi ve etüt çalışmaları yapılmıştır. Çalışma 26 (şimşir mevcudiyetinin kesin olarak bilindiği 23 il ve var olduğu düşünülen 3 ilde) ilde gerçekleştirilmiştir. Şimşir mevcudiyeti bilgisi alınan 23 il, 59 ilçe ve 195 lokasyonda yapılan saha çalışmalarından elde edilen sonuçlara göre, şimşirin 15 il ve 23 ilçede 29 lokasyonda kaldığı belirlenmiştir. Bu sonuçlarla Türkiye'nin şimşir mevcudiyetinin %85 oranında azaldığı ve sadece %15'inin kaldığı tespit edilmiştir. Şimşir güvesinin etkisinin devam etmesi nedeniyle kalan yerlerde ciddi tehdit altındadır. Şimşirler konusundaki bu ilk öncü araştırma çalışmasında, Türkiye'nin tehdit altındaki doğal şimşir türlerinin kalan son lokasyonları ve mevcut durumu tespit edilmiş ve açıklanmıştır. Türkiye'de şimşir genetik kaynaklarının korunması için acil çalışmalar yapılmasını öneriyoruz., We investigated the current status and the last locations of Turkey’s native Buxus species under threats especially with boxwood moth (Cydalima perspectalis) in detail throught the country for the first time. Within the scope of the studies, detailed field and survey studies were carried out to determine the latest status of existing boxwood existence in regions and provinces. The study was carried out in 26 (the existence of boxwood is definitely 23 provinces, 3 provinces are thought to be boxwood) provinces. According to the results obtained from field studies conducted in 23 provinces, 59 districts and 195 locations for which boxwood presence information was obtained, it was determined that boxwood remained in 29 locations in 15 provinces and 23 districts. With these results, it was determined that Turkey's boxwood presence has decreased by 85%, and only 15% of the presence of boxwood remains. Due to the continuing effect of the boxwood moth, it is under serious threat in the remaining locations. The last remaining locations of Turkey’s native Buxus species under threats were determined and described in this first pionering research study on this matter. We suggest urgent studies for the protection of boxwood genetic reseources in Turkey.