Various treatments are carried out in order to extend both the shelf life and storage life of fresh fruit and vegetables after harvest and among them non-toxic for humans, environmentally and economically friendly alternative treatments are gained more importance. In the current study, methyl jasmonate (MeJA), cytokinin, and lavender oil which are eco-friendly and safe for human health were applied on apricot fruit. The treated fruit were stored at 0 °C and 90–95% relative humidity for 25 days and catalase (CAT), superoxide dismutase (SOD), and ascorbate peroxidase (APX) enzyme activities and lipid peroxidation of apricots after treatments were studied. According to the findings obtained from the study, it was observed that 5 ppm cytokinin and 1000 ppm lavender oil treatments of apricot fruit gave better APX and CAT enzyme activity, respectively. In addition, better SOD enzyme activity in fruit was obtained with MeJA + lavender oil treatments. As a result, it can be emphasized that the product quality of apricot fruit is preserved as both the eco-friendly application of MeJA, cytokinin, and lavender oil separately from each other and the treatment of combinations between these compounds activate the enzymatic antioxidant defense systems of apricot fruit after harvest.
Öz: Sert çekirdekli meyve türlerinden olan kayısı (Prunus armeniaca L.) insanlar tarafından hem taze meyve olarak hem de işleme teknolojisinde meyve suyu, kuru kayısı ve reçel olarak tüketilmesi yaygın olarak tercih edilmektedir. Türkiye kayısı üretiminde önemli bir yere sahiptir. Kayısı taze meyve olarak hasat sonrası ömrü sınırlı olan meyve türleri arasında yer almaktadır. Çalışmada, Bebeko kayısı çeşidi kullanılmış olup, meyveler Van ekolojik koşullarında yetiştirilmiş ve hasat olumunda derilmiştir. Mevcut çalışmada hasat sonrası Metil Jasmonate (MeJA, 0.2 mM), sitokinin (5 ppm), lavanta yağı (1000 ppm), MeJA (0.2 mM) + lavanta yağı (1000 ppm) ve sitokinin (5 ppm) + lavanta yağı (1000 ppm) uygulamalarının kayısının depolanma süre ve kalitesi üzerine etkileri araştırılmıştır. Depolama boyuncu uygulama yapılan meyvelerde pH, titre edilebilir asitlik (TEA), suda çözünür kuru madde miktarı (SÇKM), meyve kabuk rengi, toplam antioksidan kapasite, toplam fenolik madde içeriği, solunum hızı ve dışsal etilen üretim miktarı belirlenmiştir. Sonuç olarak, MeJA (0.2 mM) + lavanta yağı (1000 ppm) uygulamasının ürün kalitesini 35 gün boyunca koruduğu tespit edilirken, diğer uygulamaların ise ürün kalitesini 25 gün koruduğu belirlenmiştir. Elde ettiğimiz bulgular, uygulamaların kontrol meyvelerine göre daha iyi sonuç verdiğini ortaya koymuştur.
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.
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.
This study aimed to determine the efficacy of two standards strawberry (Fragaria x ananassa Duch.) cultivars 'Rubygem' and 'Sabrina' grown under protected cultivation system in Mersin province in Turkey. The fruit quality preservation during storage in Modified atmosphere packaging (MAP) at different storage temperatures as well as preservative compatibility under Ultraviolet-C (UV-C), hot water and combined applications were studied. Strawberry fruits kept in cold temperatures (0 °C and 5 °C) for 20 days and biochemical changes (total phenolic content, total antioxidant capacity, vitamin C content and sugar content) were measured after harvest and storage The 'cv. Rubygem' kept its quality for 16 days in all treatments and for 20 days in UV-C and UV-C + hot water applications when kept at 0 °C. Also, the fruits stored at 5 °C kept their quality for 12 days and it was observed that hot water and UV-C + hot water treatments got better results in the same period and at the same storage temperature. In the 'cv. Sabrina' results showed that fruit samples at 0 °C were successfully maintained in control as well as the other 3 treatments until the 12 th day. The preservation was continued in UV-C, hot water and combined treatments on the 16 th day of the storage and the best ones were the hot water and UV-C + hot water at the end of the 20 th day. As a result, it was observed that total phenolic contents, total antioxidant activity and sugar were found decrease at the end of storage for both cultivars while fluctuations in vitamin C.
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