Peppers are cultivated in almost all provinces in Turkey, making up approximately 7% of the world’s production. In this study, the effects of pre-harvest cytokinin application on the postharvest physiology of pepper (Capsicum annuum L.) fruits (cv. Akra and Melek F1) grown in ecological conditions in Turkey (Van, eastern Turkey) were investigated. During the growing period, organic cytokinin(nytrozine) at two concentrations (50 and 100 ppm doses) was applied by spraying. Peppers were harvested in green maturity and then stored at 12 °C for 28 days. Changes in color, respiration rate, exogenous ethylene amount, antioxidative enzyme analysis (SOD, CAT and APX), lipid peroxidation, total phenolic content (TP) and antioxidant activity (AA) were determined just after the harvest and then at the 7th, 14th, 24th and 28th days. L^* values for both varieties and the control sample had fluctuations during storage, and they slightly decreased after 28 days, except for the end value of cv. Melek F1 with a 50 ppm addition. In terms of respiration rate values, the difference between applications was found to be statistically significant, except for the 14th and 24th days of storage, for cv. Akra F1; and the 0th and 28th days for cv. Melek F1, respectively. It was observed that cytokinin can delay aging in peppers of both cultivars stored for 28 days. As a result, as the used cytokinin has an organic origin, is not synthetic and does not have a negative effect on human health, it can be used safely and without a significant loss of quality characteristics for peppers. These applications have positive effects on in-package gas composition, antioxidative enzymes, lipid peroxidation, total phenolics and total antioxidant activity.

Bu araştırma 2016 yılında Diyarbakır’ın Silvan, Kulp, Hazro ilçeleri ve bağlı köylerde yetiştirilen meyvesi kalitesi ve pazar değeri yüksek, halkın tercih ettiği mahalli armut çeşitlerinden 32 genotip üzerinde yürütülmüştür. Seçilen armut genotiplerinde fenolojik gözlemler yapılmış ve toplanan meyve örneklerinde pomolojik özellikler incelenmiştir. Fenolojik özellikler olarak tomurcuk patlaması, çiçeklenme başlangıcı, tam çiçeklenme, çiçeklenme sonu tarihi, çiçeklenme süresi ve tam çiçeklenmeden hasada kadar geçen gün sayısı (TÇHGS) ve hasat tarihi belirlenmiştir. Pomolojik özellikler yönünden incelenen çeşitlerin meyve ağırlığı 39.52-263.12 g, meyve boyu 38.03-88.77 mm, meyve eni 40.85-76.97 mm, meyve sapı uzunluğu 19.87-50.10 mm, meyve sapı kalınlığı 2.45-7.98 mm, çekirdek eni 2.20-6.14 mm, çekirdek boyu 7.20-12.26 mm, meyvelerin suda çözünebilir kuru madde miktarı (SÇKM) %10.00-24.90; titre edilebilir asitliği (TA) %0.04-0.60; meyve suyu pH’sı 4.07-5.26 arasında değişim göstermiştir. Bunun yanında mahalli armutlarda meyve kabuğu rengi, meyve eti rengi meyvelerde kumluluk ve tat durumları da belirlenmiştir. Tüm bu değerlendirmeler neticesinde tartılı derecelendirme yöntemine göre yüksek puan alan 21 HZR 01, 21 SLV 01, 21 SLV 11, 21 SLV 23, 21 SLV 13 ve 21 SLV 14 genotiplerinin diğer genotiplere göre daha üstün olduğu saptanmıştır.

Tr en Bu çalışmada hasat öncesi UV-C, Sıcak Su ve UV-C + Sıcak Su uygulamalarının Mersin Toroslar koşullarında yetiştirilen ‘0900 Ziraat’ kiraz çeşidinin soğukta muhafazası süresince kalite ve özellikle fenolik bileşiklerin değişimleri incelenmiştir. Bu amaçla depolama öncesi kiraz meyvelerine 5 dakika süreyle UV-C ve 1 dakika süreyle 50 °C’de sıcak uygulaması yapılmıştır. Tam olum döneminde hasat edilen meyveler 20 gün süre ile modifiye atmosfer paketleri (Xtend®) içerisinde 0 ˚C sıcaklık ve %90±5 oransal nem koşullarında depolanmıştır. Depolama periyodu süresince her 4. gün meyve örneklerinde; ağırlık kaybı, meyve kabuk rengi, suda çözünebilir kuru madde, titre edilebilir asit miktarı, toplam fenolik ve antioksidan analizleri yapılmıştır. Ayrıca uygulamaların fenolik maddelere etkileri detaylı olarak incelenmiştir. Çalışma sonucunda ele alınmış olan bütün kalite değerlerinde hasat sonrası kimyasal içermeyen ve alternatif bir uygulama olan UV-C uygulamasının depolama süresince meyve kalitesini daha iyi koruduğu, aynı zamanda fenolik maddelerden protokateşuik, klorojenik asit ve Q-kumarik asit miktarında azalmayı sınırlandırdığı tespit edilmiştir. In this study, effects of post-harvest UV-C, Hot Water and UV-C + Hot Water treatments on quality attributes and especially on phenolics of ‘0900 Ziraat’ cherries grown under Mersin Taurus Mountains conditions throughout the cold storage were investigated. For this purpose, before to store, cherry fruits were subjected to UV-C treatments for 5 minutes and Hot Water treatments at 50 °C for 1 minute. The fruits harvested at full-ripe period were then stored in modified atmosphere packages (MAP) (Xtend®) for 20 days at 0 ^oC temperature and 90±5% relative humidity. Throughout the storage period, weight loss, skin color, suspended solids content, titratable acidity, total phenolics and antioxidant analyses were performed in every 4^th day of storage (0, 4, 8, 12, 16 and 20^th days).Effects of experimental treatments on phenolics were investigated in detail. Present findings revealed that UV-C + Hot Water treatments without any chemicals better preserved the quality attributes and significantly restricted the losses in protocatechic acid, chlorogenic acid and q-coumaric acid contents.

Maintaining the postharvest quality of tomatoes, which are essential in the world vegetable trade, is very important; otherwise, storage may cause severe quality and economic losses. This study aimed to determine the effects of 1-MCP treatments on quality and storage time to prevent quality loss and deterioration in tomatoes due to high temperature and to predict ethylene production through the Multivariate Adaptive Regression Splines algorithm during long-term storage. For this purpose, same-sized fruits were divided into three different groups. Two groups were treated with 1-MCP (625 and 1250 ppb), and the untreated fruit was the control. Then, the tomatoes were stored for 39 days at a temperature of 20 °C and relative humidity of 85–90%. The results obtained from the present study showed that the 1-MCP treatments prolonged the life and maintained the quality of tomato fruit during storage. The ethylene production and respiration rate were significantly lower in 1-MCP-treated fruit than in the untreated fruit during the storage period (p < 0.05). According to the Multivariate Adaptive Regression Splines algorithm, it was observed that increasing doses of 1-MCP inhibited ethylene production. Furthermore, weight loss and respiratory rate were effective on ethylene production at 100 and 43.9%, respectively. In conclusion, treating the fruit with 1250 ppb of 1-MCP was determined to be the best practice for maintaining all quality criteria during storage.