Browsing by Author "Islek, Firat"

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Effect of Exogenous Essential Oil Treatments on the Storage Behaviour of Apricot Fruit Harvested at Different Altitudes
(Sciendo, 2023) Yilmaz, Nurettin; Islek, Firat; Cavusoglu, Seyda; Necas, Tomas; Ondrasek, Ivo; Ercisli, Sezai
Due to the short shelf life of fresh apricots, special postharvest preservation techniques and practices are necessary to avoid significant economic losses. The purpose of the current study is to bring to light an approach that can be used to extend the storage life of apricot fruits treated with essential oils (EOs) (peppermint, thyme and carob EO) and examine the effects of two altitudes (1000 m and 1200 m) on the organic acid levels and respiration rate of apricot fruit during long-term storage. The results show that growing apricots at high altitudes increases the level of organic acids in the fruit, improving its quality and extending its postharvest life. Additionally, treating apricots with EOs postharvest slows down the respiration rate, reducing the consumption of organic acids during storage compared to the untreated fruit. The organic acid content was significantly higher in 'Kabaasi' than in 'Hacihaliloglu', and fruit harvested at 1200 m had significantly higher levels of organic acid than the fruit harvested at 1000 m. During storage, the highest organic acid content and the lowest respiration rate were observed in the fruit of both cultivars treated with peppermint, carob, and thyme oil, as compared to control fruit, respectively. To summarize, the use of EOs as postharvest treatment for apricot is recommended for maintaining the quality of the fruit during extended storage.
Effect of Methyl Jasmonate Treatments on Fruit Quality and Antioxidant Enzyme Activities of Sour Cherry (Prunus Cerasus L.) During Cold Storage
(Galenos Publ House, 2021) Cavusoglu, Seyda; Yilmaz, Nurettin; Islek, Firat; Tekin, Onur
The study was carried out to investigate the effect of methyl jasmonate (MeJA) treatments (0.5 and 1.0 mM MeJA) on quality characteristics such as weight loss, respiration rate, ethylene production, color, total phenolic content (TPC), total antioxidant capacity (TAC) and antioxidant enzyme activities of sour cherry fruit (Prunus cerasus L. cv. 'Kutahya') during cold storage. Fruit were stored at 0 +/- 1 degrees C and 90 +/- 5% RH for 36 days. The results indicated that MeJA treatments showed higher levels of total phenolic content, total antioxidant capacity and quality and were also effective on superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), malondialdehyde (MDA), ethylene production and respiration rate. In conclusion, 0.5 mM MeJA treatment showed the best maintaining of fruit quality among the concentrations of MeJA. It can be suggested that sour cherry could be stored successfully for 36 days at 0 degrees C following treatment of MeJA.
Effect of Methyl Jasmonate, Cytokinin, and Lavender Oil on Antioxidant Enzyme System of Apricot Fruit (Prunus Armeniaca L.)
(Mdpi, 2021) Cavusoglu, Seyda; Yilmaz, Nurettin; Islek, Firat; Tekin, Onur; Sagbas, Halil Ibrahim; Ercisli, Sezai; Necas, Tomas
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 degrees 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.
Effect of Postharvest Edible Coating Materials on Sugar and Organic Acid Content of Fresh-Cut Melons Grown With Different Fertilizer Treatments
(Tubitak Scientific & Technological Research Council Turkey, 2023) Islek, Firat; Cavusoglu, Seyda
The demand for convenient and ready-to-eat food has increased, including fresh-cut fruit and vegetables. At the same time, people are also becoming more health-conscious and are aware of the positive impact of healthy food choices on their well-being. Fresh-cut fruit and vegetables are seen as a healthy and convenient option that allows people to meet their nutritional needs without sacrificing their busy lifestyles. This study examines the use of sustainable fertilization practices for growing melons and the application of edible coatings on fresh-cut fruit to preserve their freshness and levels of sugar and organic acids during storage. The cv. 'Kirkagac' melon was used as the plant material. In the current study, the materials needed for preharvest fertilizer applications (humic acid, liquid worm fertilizer, and organomineral fertilizer) were obtained from a commercial company. The materials needed for postharvest edible coating (sodium alginate, pectin, and carob gum) were obtained from a different company. According to the results, the total sugar content of the melons increased as they ripened, but the application of an edible pectin coating helped to control this increase in sugar content better than the other treatments. This is because the pectin coating slowed down the ripening process by reducing the rate of respiration and ethylene release. The results of the study indicated that there were significant differences (p < 0.05) observed between the control group and the samples treated with edible coatings in all parameters measured. In summary, this study suggests that sustainable fertilization practices could be a viable option for cultivating melons, and that edible coatings could be used as novel materials in commercial treatments to maintain the quality of fresh-cut melons during storage.
Effect of Pre-Harvest Organic Cytokinin Application on the Post-Harvest Physiology of Pepper (Capsicum Annuum L.)
(Mdpi, 2021) Cavusoglu, Seyda; Sensoy, Suat; Karatas, Arzu; Tekin, Onur; Islek, Firat; Yilmaz, Nurettin; Mlcek, Jiri
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 degrees 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.