Browsing by Author "Öktem H.A."
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Scopus Antioxidative and physiological responses of two sunflower (Helianthus annuus) cultivars under PEG-mediated drought stress(2012-11-12) Baloǧlu M.C.; Kavas M.; Aydin G.; Öktem H.A.; Yücel A.M.Drought stress is one of the most important yield-reducing factors in crop production. Sunflower, an oilseed crop, is severely affected by abiotic stress. In this study, 2 sunflower cultivars (Musala and Aydi{dotless}n) were evaluated in terms of various biochemical and physiological responses under 2 different polyethylene glycol-mediated drought stress conditions. Stress-determining parameters such as malondialdehyde (MDA), hydrogen peroxide (H2O2), and proline contents were determined. Both cultivars showed similar responses at osmotic potentials of both -0.4 and -0.8 MPa. Aydi{dotless}n was less affected than Musala under these stress conditions. MDA, H2O2, and proline levels were similar at both -0.4 and -0.8 MPa osmotic potentials in the 2 different cultivars. The 2 cultivars differed significantly in ascorbate peroxidase and catalase enzyme activities, which were more prominent in Aydi{dotless}n for both stress levels. However, glutathione reductase activity did not appear to be an essential part of the antioxidative system in either of the cultivars. Engineering antioxidative enzyme levels might provide a potential mechanism to cope with drought stress in sunflower. © TÜBİTAK.Item Ayçiçeğinde Helianthus Annuus Tuz Stresine Bağlı Morfolojik Ve Fizyolojik Değişimlerin İncelenmesi(2007) Çelikkol Akçay U.; Baloglu Mc; Cansız S.; Çetinkaya Ö. Kavas M.; Öktem H.A.; Yücel M.Scopus Enhanced salt tolerance of transgenic tobacco expressing a wheat salt tolerance gene(2016-01-01) Kavas M.; Baloğlu M.C.; Yücel A.M.; Öktem H.A.Soil salinity is one of the most important limiting factors of agricultural productivity in the world. The Triticum aestivum salt tolerance-related gene (TaSTRG) possesses a functional response to salt and drought stress conditions. A variety of stress factors, such as salt, drought, abscisic acid, and cold, may induce the expression of TaSTRG in wheat. In this study, the TaSTRG gene was transferred to tobacco via Agrobacterium-mediated transformation. Overexpression of TaSTRG in transgenic tobacco plants indicated higher salt tolerance and mediated more vigorous growth than in wild-type plants. Under salt stress conditions, the transgenic tobacco plants had higher germination and survival rates and longer root length than the control plants. Under salt treatments (200–250 mM), TaSTRGoverexpressing tobacco plants accumulated a higher amount of proline and had significantly lower malondialdehyde content than wild-type plants. Furthermore, transgene inheritance followed Mendelian laws, indicating the stability of TaSTRG in transgenic tobacco plants. These results indicated that the wheat TaSTRG gene plays an important role in responding to salt stress.Item Kuraklık Stresinin Kavun Cucumis Melo L Antioksidatif Savunma Sistemi Üzerindeki Etkisi(2009) Ercan O.; Baloglu Mc; Kavas M.; Gökçay D.; Köse F.S.; Öktem H.A.; Yücel M..Item Nac Tipi Transkripsiyon Faktörlerinin Monokot Ekspresyon Vektörüne Klonlanması(2010) Eroğlu A.; Baloglu Mc; Kalemtaş G.; Kayıhan C.; Ayşin; F. Battal A.; Öktem H.A.; Yücel M.Scopus Nanotechnology in food and agriculture(2020-01-01) Eyidoğan F.; Bayraç C.; Bayraç A.T.; Baloğlu M.C.; Ünel N.M.; Öktem H.A.Due to their extraordinary properties, nanoparticles have enormous applications in different fields. Nanotechnology is an obstructive field and has a potential with developed methods to change the current scenario of the food and agricultural industry. Developments and innovations in nanotechnology like nanosensors, nanopesticides, nanofertilizers, nanoencapsulation, and active packaging, facilitated the transformations in food and agriculture sectors. In this chapter, the most recent applications of nanotechnology in food and agriculture and the safety issues of nanomaterials in processing and packaging are discussed. Nanotechnology exhibits promising potentials to be widely utilized in every aspect of food and agriculture. Therefore, the rapid progress of nanotechnology will be helpful to facilitate the development of agriculture and the food sector.Item Serratia Marcescens E Ait Kitinaz A Geninin Tütün Bitkisine Aktarılması(2009) Okay S.; Baloglu Mc; Eroğlu A.; Battal A.; Özcengiz G; Öktem H.A.; Yücel M.