Browsing by Author "Tunctuerk, Murat"

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Ascorbic Acid Enhances Growth and Dualex Parameters in Arachis Hypogaea L. Under Salt Stress
(Springernature, 2024) Tunctuerk, Ruveyde; Oral, Erol; Tunctuerk, Murat; Nohutcu, Luetfi; Najafi, Solmaz; Danesh, Younes Rezaee; Pace, Loretta
Salt stress limits crop productivity in arid and semi-arid regions, posing a significant challenge to agricultural sustainability. This study investigates the potential of ascorbic acid (AA) to alleviate the harmful effects of sodium chloride (NaCl) in Arachis hypogaea L. by applying AA concentrations of 0, 100, 200, and 300 ppm and NaCl levels of 100 and 200 mM under controlled conditions. Results showed that the application of 300 ppm AA under 200 mM NaCl notably mitigated salt-induced reductions, enhancing stem and root lengths by 33% and 14% and increasing stem fresh and dry weights by 67% and 39%, respectively. Comparative analysis showed a 3% decrease in plant temperature, a 56% increase in leaf area, and a 59% reduction in malondialdehyde, underscoring AA's protective effects. Although not all measured parameters responded significantly to AA under salt stress, these findings highlight the compound's potential to counteract growth reductions in A. hypogaea, demonstrating its value for sustainable agricultural practices under saline conditions.
Determination of Yield and Some Yield Components of Some Linens (Linum Usitatissimum L.) Cultivars in Van Ecological Conditions
(Ankara Univ, Fac Agr, 2007) Tunctuerk, Murat
This study has been conducted out to determine of suitable line cultivars for Van ecological conditions in 2002-2003. In the research established with 3 repetitions according to random blocks experimental pattern, 11 different linen cultivars; (Antares, San-85, Linda, Flanders, Atalanta, Norman, McGregor, Dakota, Raulin, Mikael and Royal) have been evaluated in terms of yield and yield elements. In the research, the qualities of plant height, number of main branches, number of capsules in plant, number of seeds in capsule, initial branch height, 1000 seed weight, seed yield, protein ratio, lipid ratio and lipid yield have been examined. At the end of the research, statistically significant differences were found between linen cultivars in terms of examined properties in both experiment years. In the study, the highest seed (141.7-149.0 kg/da) and lipid (49.8-50.8 kg/da) yield were obtained from Linda linen cultivar in both experiment years.
Effects of Different Nitrogen Doses on the Agricultural and Chemical Properties of Fennel (Foeniculum Vulgare Mill.)
(Asian Journal of Chemistry, 2008) Tunctuerk, Murat
Fertilization is-one of the main factors affecting yield and quality in medicinal and aromatic plants like in other traditional crops, In this concept, the effects of four different nitrogen doses (0,20, 40 and 60 kg ha(-1)) on the yield and quality of fennel were investigated. Field trials were conducted by completely randomized design with three replications at experimental area located in Gevas-Cicekli district of Van, Turkey, in the years of 2001 and 2002. In this study, plant height, the number of-branches, the number of umbrella, seed yield and essential oil yield of fennel were investigated. As a result, the highest plant height (59.3 cm) and essential oil yield (13.9 L ha(-1)) values v ere determined in 60 kg ha(-1) nitrogen application. The highest the number of branches (6.1 branches plat(-1)), the number of umbrella (10.98 umbrellas plant(-1)) and seed yield 665.0 kg ha(-1)) values were obtained from 40 kg ha(-1) nitrogen application.
Uncommon Terpenoids From Salvia Species: Chemistry, Biosynthesis and Biological Activities
(Mdpi, 2022) Hafez Ghoran, Salar; Taktaz, Fatemeh; Mozafari, Ali Akbar; Tunctuerk, Murat; Sekeroglu, Nazim; Kijjoa, Anake
The search for new bioactive compounds from plant sources has been and continues to be one of the most important fields of research in drug discovery. However, Natural Products research has continuously evolved, and more and more has gained a multidisciplinary character. Despite new developments of methodologies and concepts, one intriguing aspect still persists, i.e., different species belonging to the same genus can produce different secondary metabolites, whereas taxonomically different genera can produce the same compounds. The genus Salvia L. (Family Lamiaceae) comprises myriad distinct medicinal herbs used in traditional medicine worldwide that show different pharmacological activities due to the presence of a variety of interesting specialized metabolites, including mono-, sesqui-, di-, sester-, tri-, tetra-, and higher terpenoids as well as phenylpropanoids, phenolic acid derivatives, lignans, flavonoids, and alkaloids. We herein summarize the research progress on some uncommon terpenoids, isolated from members of the genus Salvia, which are well recognized for their potential pharmacological activities. This review also provides a current knowledge on the biosynthesis and occurrence of some interesting phytochemicals from Salvia species, viz. C-23-terpenoids, sesterterpenoids (C-25), dammarane triterpenoids (C-30), and uncommon triterpenoids (C-20+C-10). The study was carried out by searching various scientific databases, including Elsevier, ACS publications, Taylor and Francis, Wiley Online Library, MDPI, Springer, Thieme, and ProQuest. Therefore, 106 uncommon terpenoids were identified and summarized. Some of these compounds possessed a variety of pharmacological properties, such as antibacterial, antiviral, antiparasitic, cytotoxic and tubulin tyrosine ligase inhibitory activities. Due to the lack of pharmacological information for the presented compounds gathered from previous studies, biological investigation of these compounds should be reinvestigated.