Browsing by Author "Turfan, N."
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Web of Science Ameliorative effects of humic acid and L-tryptophan on enzyme activity, mineral content, biochemical properties, and plant growth of spinach cultivated in saline conditions(2024.01.01) Turfan, N.; Kibar, B.; Davletova, N.; Kibar, H.Salinity poses a significant abiotic stress that limits plant productivity, thereby posing a serious threat to agricultural sustainability and worldwide food security. Techniques that can overcome this problem are needed. Recent focus has been placed on employing organic substances like humic acid (HA) and amino acids, including L-tryptophan (L-TRP), to mitigate the negative effects of salt stress on cultivated plants. Accordingly, in this research, the impact of foliar applications of HA and L-TRP, both separately and combined, on the growth parameters and biochemical properties of spinach subjected to salt stress was investigated. In the present study, eight treatments (1. control, 2. salt (NaCl), 3. HA, 4. L-TRP, 5. HA + NaCl, 6. L-TRP + NaCl, 7. HA + L-TRP, and 8. HA + L-TRP + NaCl) were investigated. The study showed that salt stress markedly reduced several growth properties in spinach, including plant height, number of leaves, leaf dimensions, and both fresh and dry weight. Additionally, it significantly lowered contents of chlorophyll (a, b, and total), carotenoid, polyphenol, lutein, anthocyanin, polyphenol oxidase, glycine betaine, relative water content, and the antioxidant enzyme activities (ascorbate peroxidase, catalase, peroxidase, and superoxide dismutase). On the other hand, significant increases were observed in sodium, chlorine, potassium, sulfur, zinc, nickel, proline, malondialdehyde, and hydrogen peroxide levels of spinach with salinity. Individual and combined applications of HA and L-TRP positively influenced plant growth, relative water content, activities of antioxidant enzyme, chlorophyll, and mineral contents of spinach under both normal and saline conditions. In conclusion, the combined use of HA and L-TRP under salt stress conditions is promising in mitigating the negative impacts of salinity and can be suggested as an effective alternative approach for cultivating spinach in saline environments.Pubmed Exogenous citric acid, salicylic acid, and putrescine treatments preserve the postharvest quality and physicochemical properties of broccoli ( Brassica oleracea L. var. italica) during cold storage(2024) Kibar, H.; Kibar, B.; Turfan, N.To extend the postharvest storage life of broccoli samples ( L. var. ), an exogenous application of citric acid (CA), salicylic acid (SA), and putrescine (PUT) was tested in multiple combinations (0.5 and 1 mM) at 4 ± 0.5°C and 90 ± 5% relative humidity (RH) for 21 days (d). The weight loss (WL), respiration rate (RR), total soluble solids (TSS), pH, color (*, *, *, chroma, and hue angle), proximate and mineral contents, phenolic and flavonoid contents, and other biochemical properties of the treated and untreated broccoli samples were evaluated throughout the storage duration. The lowest WL was observed when exposed to 0.5 mM of PUT. 1 mM CA and PUT treatments were affected by RR, depending on storage conditions. The lowest TSS content was observed in broccoli samples treated with 0.5 mM CA among all treatments. The chroma value of the samples was preserved by the 0.5 mM SA treatment. The most abundant element in broccoli samples was potassium in the control application, followed by a 1 mM SA treatment. In addition, the protein content was the highest in the 1 mM PUT treatment. The highest vitamin C was determined in the 1 mM CA treatment, and the most abundant vanillic acid was found in broccoli exposed to the 0.5 mM and treatment. Glucose content was determined at the lowest level in the 0.5 mM SA treatment, while higher increases occurred in other treatments. In terms of these findings, 1 mM CA, 1 mM SA, and 1 mM PUT delay WL, RR, and color degradation and prolong the storage life of broccoli samples stored at 4 ± 0.5°C. It was concluded that the biochemical content, fresh weight, and green color of broccoli samples throughout postharvest and storage can be maintained longer by exogenous application of these natural compounds. Therefore, we recommend 1 mM PUT and 1 mM CA treatments to maintain the quality of broccoli by minimizing losses in morphological properties, mineral, and biochemical compositions during postharvest storage.Scopus Exogenous citric acid, salicylic acid, and putrescine treatments preserve the postharvest quality and physicochemical properties of broccoli (Brassica oleracea L. var. italica) during cold storage(John Wiley and Sons Inc, 2024) Kibar, H.; Kibar, B.; Turfan, N.To extend the postharvest storage life of broccoli samples (Brassica oleracea L. var. italica), an exogenous application of citric acid (CA), salicylic acid (SA), and putrescine (PUT) was tested in multiple combinations (0.5 and 1 mM) at 4 ± 0.5°C and 90 ± 5% relative humidity (RH) for 21 days (d). The weight loss (WL), respiration rate (RR), total soluble solids (TSS), pH, color (L*, a*, b*, chroma, and hue angle), proximate and mineral contents, phenolic and flavonoid contents, and other biochemical properties of the treated and untreated broccoli samples were evaluated throughout the storage duration. The lowest WL was observed when exposed to 0.5 mM of PUT. 1 mM CA and PUT treatments were affected by RR, depending on storage conditions. The lowest TSS content was observed in broccoli samples treated with 0.5 mM CA among all treatments. The chroma value of the samples was preserved by the 0.5 mM SA treatment. The most abundant element in broccoli samples was potassium in the control application, followed by a 1 mM SA treatment. In addition, the protein content was the highest in the 1 mM PUT treatment. The highest vitamin C was determined in the 1 mM CA treatment, and the most abundant vanillic acid was found in broccoli exposed to the 0.5 mM and treatment. Glucose content was determined at the lowest level in the 0.5 mM SA treatment, while higher increases occurred in other treatments. In terms of these findings, 1 mM CA, 1 mM SA, and 1 mM PUT delay WL, RR, and color degradation and prolong the storage life of broccoli samples stored at 4 ± 0.5°C. It was concluded that the biochemical content, fresh weight, and green color of broccoli samples throughout postharvest and storage can be maintained longer by exogenous application of these natural compounds. Therefore, we recommend 1 mM PUT and 1 mM CA treatments to maintain the quality of broccoli by minimizing losses in morphological properties, mineral, and biochemical compositions during postharvest storage.Web of Science Exogenous citric acid, salicylic acid, and putrescine treatments preserve the postharvest quality and physicochemical properties of broccoli (Brassica oleracea L. var. italica) during cold storage(2023.01.01) Kibar, H.; Kibar, B.; Turfan, N.To extend the postharvest storage life of broccoli samples (Brassica oleracea L. var. italica), an exogenous application of citric acid (CA), salicylic acid (SA), and putrescine (PUT) was tested in multiple combinations (0.5 and 1 mM) at 4 +/- 0.5 degrees C and 90 +/- 5% relative humidity (RH) for 21 days (d). The weight loss (WL), respiration rate (RR), total soluble solids (TSS), pH, color (L*, a*, b*, chroma, and hue angle), proximate and mineral contents, phenolic and flavonoid contents, and other biochemical properties of the treated and untreated broccoli samples were evaluated throughout the storage duration. The lowest WL was observed when exposed to 0.5 mM of PUT. 1 mM CA and PUT treatments were affected by RR, depending on storage conditions. The lowest TSS content was observed in broccoli samples treated with 0.5 mM CA among all treatments. The chroma value of the samples was preserved by the 0.5 mM SA treatment. The most abundant element in broccoli samples was potassium in the control application, followed by a 1 mM SA treatment. In addition, the protein content was the highest in the 1 mM PUT treatment. The highest vitamin C was determined in the 1 mM CA treatment, and the most abundant vanillic acid was found in broccoli exposed to the 0.5 mM and treatment. Glucose content was determined at the lowest level in the 0.5 mM SA treatment, while higher increases occurred in other treatments. In terms of these findings, 1 mM CA, 1 mM SA, and 1 mM PUT delay WL, RR, and color degradation and prolong the storage life of broccoli samples stored at 4 +/- 0.5 degrees C. It was concluded that the biochemical content, fresh weight, and green color of broccoli samples throughout postharvest and storage can be maintained longer by exogenous application of these natural compounds. Therefore, we recommend 1 mM PUT and 1 mM CA treatments to maintain the quality of broccoli by minimizing losses in morphological properties, mineral, and biochemical compositions during postharvest storage.TRDizin Sapsız meşe tohumlarının bazı kimyasal bileşenlerin belirlenmesi; Demirköy Orman İşletme Müdürlüğü Örneği(2023) Meşe, Ö.; Turfan, N.; Öner, M.N.Ağaç ıslahı, ormancılıkta üretimi artırmanın en etkili yollarından biridir. Islah edilmiş tohumların kullanılması, ağaçlandırma çalışmalarında birim alan verimliliğinin artırılmasına önemli katkı sağlamaktadır. Bu nedenle kaliteli ve uygun orijinli tohumların kullanılması önemlidir. Fenotipik seleksiyona dayalı tohum seçiminin yanı sıra kimyasal içeriğinin belirlenmesi de kaliteli tohum üretimine önemli katkı sağlamaktadır. Bu çalışmada, ülkemiz ormanlarının kapladığı alan açısından önemli bir paya sahip doğal meşe türlerinden Quercus petraea subsp. petraea (Mattuschka) Liebl.’nin tohumları üzerinde kimyasal ölçümler yapılmıştır. Meşe tohumları Kırklareli ili Demirköy Orman İşletme Müdürlüğü Karacadağ Orman İşletme Şefliği sınırları içerisinde yer alan saf sapsız meşe meşcerelerinden toplanmıştır. Çimlenen, çimlenmeyen, bozuk ve çürük tohumlar şeklinde ayrılan tohumlarda prolin, glikoz, sukroz, fenolik bileşikler, pirüvat, malondialdehit (MDA) ve hidrojen peroksit (H2O2) miktarları belirlenmiştir. İstatistiksel analizde gruplar arasında anlamlı fark bulunmuşturWeb of Science Variation of biochemical content in the almonds of the endemic Argan tree (Argania spinosa (L.) Skeels) populations in Morocco(2024) Ayan, S.; Abdaloglu, G.; Laaribya, S.; Turfan, N.; Çelik, E.N.Y.; Ouhaddou, H.; Alaoui, A.In this study, it was aimed to determine the variation of the biochemical characteristics of the argan [Argania spinosa (L.) Skeels] in natural distribution areas in Morocco. For this aim, it was used 13 populations, which are representative of the taxon on different sub-ecoregion in Morocco, to determine some biochemical compositions characters such as malondialdehyde (MDA), hydrogen peroxide (H2O2), proline, protein, flavonoid, phenol, glucose, sucrose, fructose, enzyme activities of superoxide dismutase (SOD), and peroxidase (POD) were analyzed. To determine variations among the population were analyzed using ANOVA. In addition, the phylogenetic relationship among the populations was revealed by Cluster Analysis. As a result of the research, significant differences were determined in terms of all parameters such as proline, protein, flavonoid, phenol, glucose, sucrose, fructose, MDA, H2O2, SOD, and POD of almond diversity among the populations. According to the Cluster Analysis, the results showed that the Tamanar population was relatively different from all other populations. The results obtained in the research confirm the high variety of different habitats in the natural distribution areas of argan in Morocco. The revealing of the diversity among the populations in the natural distribution area of this extremely degraded species is of primary importance for the conservation policies and sustainable use of the species.