Melatonin acts as a seed germination activator, plant growth regulator, leaf senescence retardant, and, in general, has a multifunctional role as a ‘defence molecule’; furthermore, by interacting with other molecules, such as phytohormones and gaseous molecules, it greatly enhances plant adaptation to different environments. However, there are not enough studies about the use of melatonin on horticultural crops, and even fewer studies have outlined the differences related to this phytohormone use between protected environment and in open field. The two latter systems have different growing conditions that could lead to diversified application doses. As the choice of melatonin dose depends on all crop system components, the present research aimed to assess the effects of three melatonin concentrations (1 ppm, 5 ppm and 10 ppm) plus an untreated control, on yield, quality, and antioxidants of four strawberry cultivars (i.e., Kabarla, Fortuna, Sweet Ann, Festival) grown either in greenhouse or in open field. Research was conducted to assess the yield parameters were better affected by greenhouse than open field, and mean fruit weight was the highest in cultivar Sweet Ann. In open field 10 ppm showed the highest values of fruit number and yield, but in greenhouse did not differ from 5 ppm which led to the highest fruit number. At all melatonin doses, cultivar Kabarla demonstrated the highest yield, compared to the other cultivars, with the maximum value of about 46 t·ha⁻¹. Plant dry weight was 90% higher under greenhouse than in open field conditions, and 52% or 132% higher with cultivar Kabarla in comparison with Fortuna and Sweet Ann, respectively. The melatonin dose of 10 p.p.m showed 56% higher plant dry weight in comparison to the untreated control. Fortuna showed higher values of fruit dry matter, soluble solids, and glucose than Sweet Ann. The fruit dry matter was 7% lower at 10 ppm melatonin than in the untreated control. Fructose was higher under 1 ppm melatonin with 245 mg·g⁻¹ d.w. compared to the untreated control with 220 mg·g⁻¹ d.w. in Festival, whereas in Fortuna was the highest in the control fruits, the latter also showing the highest titratable acidity in Fortuna and Sweet Ann. The highest phenolics content was recorded under 10 ppm melatonin in open field, and with 5 ppm in greenhouse; the phenolics content was the highest under 1 ppm melatonin dose in Kabarla and 5 ppm in Fortuna. Under the protected environment 5 and 10 p.p.m. melatonin elicited the highest accumulation of ascorbic acid; 10 ppm were more effective in Fortuna and Sweet Ann, and 5 ppm in Festival. The most enhanced antioxidant activity was recorded under 5 p.p.m. melatonin dose in Fortuna and Festival. The present study confirms that the dose of melatonin to apply to strawberry crop closely relates both to cultivar and crop system.

Rosehip, Rosa canina L. fruit, is valued for its flavor, taste, color and aroma, in accordance with its recognition as one of richest sources of pro-health compounds. Screening, preservation and propagation of the most valuable local populations of rosehip are performed for food, pharmacological, and cosmetic applications. Eleven native R. canina genotypes from the Interior Aegean region, Turkey, were collected and analyzed regarding organic acids, phenolic compounds, sugars, and DPPH scavenging activity within this study. Regarding biochemical profile of fruits, protocatechuic acid and quercitrin were the most dominant compounds among 12 identified phenolics. The dominant organic acids were malic and citric and fructose and glucose were the dominant sugars. There was no correlation between DPPH scavenging activity and the analyzed chemicals in fruits. Although levels of certain compounds varied significantly between consecutive years, the ranking of genotypes according to the levels of particular chemicals was maintained. Generally, the most promising chemotype regarding biological value was 64US03. The chemical composition and the presence of bioactive compounds make the native to Interior Aegean R. canina genotypes a valuable source of bioactive agents preventing oxidative-stress related diseases.

Amaç: Bu çalışmanın amacı, doğal ceviz genotiplerinin pomolojik ve fenolojik özelliklerini, yandal verimlilikleri ve yağ içeriğini araştırmak, üstün olanları seçmek ve üstün olanları gen kaynağı olarak korumaktır. Bu amaca ulaşmak için Burdur ili Tefenni ilçesinde 3 yıllık bir çalışma yapılmıştır (2014-2016) Materyal ve Yöntem: Tartılı derecelendirme yöntemine göre değerlendirilen on genoip ümitvar bulunmuştur. Yörede yaygın olarak yetiştirilen Yavuz-1 çeşidi genotipleri değerlendirilmesinde referans çeşit olarak kullanılmıştır. Araştırma Bulguları: Ümitvar olarak değerlendirilen genotiplerin randımanı %43.70 - %65.09 arasında, meyve ağırlıkları 8.95-13.04 g, iç ağırlıkları 4.87 ile 6.53 g arasında ve kabuk kalınlıkları 0.70 mm ile 1.65 mm arasındadır. Meyveler irilik bakımından ekstra sınıfta ve tümü yuvarlak şekillidir. Ümitvar olarak seçilen on genotipten yedi genotip açık, üç genotip esmer kabuk renginde; beş genotip pürüzlü kabuk, beş genotip orta pürüzlü; yedi genotip zor kırılan, üç genotip kolay kırılan sınıfta bulunmuştur. İç dolgunluğu sekiz genotipte iyi, iki genotipte orta; meyve içinin tam olarak çıkma durumu; yedi genotipte iyi, üç genotipte kötü çıkmıştır. Sonuç: Seçilen genotipler iç rengi bakımından çok iyi sonuçlar vermiş sekiz tanesi açık, iki genotip çok açık olarak belirlenmiştir. Genotiplerin oransal yağ miktarı %62.29 (15.TE.013) ile %70.24 (15.TE.001) arasında bulunmuştur. Yan dallardaki meyve tutum oranı %45-60 arasında bulunmuştur. Seçilen tüm genotipler protandri çiçek özelliğindedir.