Browsing by Author "Turkmen, Onder"

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Comparison of Some Local Melon Genotypes Selected From Lake Van Basin With Some Commercial Melon Cultivars for Some Yield and Quality Related Traits Observed in Field and High Tunnel Conditions
(Academic Journals, 2008) Erdinc, Ceknas; Turkmen, Onder; Sensoy, Suat
This study aimed to compare some local melon (Cucumis melo L.) genotypes selected from the Lake Van Basin (65 ER 02, 65 ER 04, and 13 TAT 05) with some commercial melon cultivars (Ananas, Makdimon F(1), and Rambo F(1)) for some yield and quality related traits observed in field and high tunnel conditions for two years. At the end of the study, it was determined that Makdimon F(1) produced the highest early and total yields (14.76 and 30.51 t ha(-1), respectively). While the locally selected melon genotype 65 ER 04 followed Makdimon F(1) for the early yield (11.43 t ha(-1)), the locally selected genotype 65 ER 02 followed Makdimon F1 for the total yield (22.49 t ha(-1)). The cultivars Rambo F(1) and Makdimon F(1) had higher soluble solid contents than the others.
Effects of Different Arbuscular Mycorrhizal Fungi (Amf) Species on Some Bean (Phaseolus Vulgaris L.) Cultivars Grown in Salty Conditions
(Academic Journals, 2010) Ciftci, Vahdettin; Turkmen, Onder; Erdinc, Ceknas; Sensoy, Suat
This study was carried out to determine the effects of three different Arbuscular Mycorrhizal Fungi (AMF) species (Glomus mosseae, Glomus intraradices and Glomus fasciculatum) on the growth and nutrient contents of four bean cultivars (Onceler, Seker, Terzibaba and Sehirali) grown under salt stress. The constant amount of NaCl (50 ppm) was added the autoclaved growth medium containing 1:1:1: ratios of soil, sand, and manure. The five gram (25 spores g(-1)) of inoculum was placed in the seedling growth medium before the seeds were sown. At the end of the study, some nutrients such as N, P, K, Ca, Mg, Fe, Cu, Mn, and Zn and plant growth parameters such as shoot height, stem diameter, root length, leaf number, leaf area, and dry and fresh weights of shoots and roots were investigated. Moreover, the plant colonization rates of AMF species were determined. The AMF species had positive effects on the plant growth and nutrient intake. Among the bean cultivars, Onceler and Terzibaba, and among the AMF species, G. mosseae had the best results for plant growth.
Phosphorus and Humic Acid Application Alleviate Salinity Stress of Pepper Seedling
(Academic Journals, 2010) Cimrin, K. Mesut; Turkmen, Onder; Turan, Metin; Tuncer, Burcu
Humic acid is a commercial product that contains many elements which improve the soil fertility and increase the availability of nutrient elements. It consequently affects plant growth and yield and ameliorates the deleterious effects of salt stress. The objective of the study was to determine the effect of humic acids and phosphorus on growth and nutrient content of pepper seedlings (cv. Demre) grown under moderate salt stress in growth chamber conditions. Applications of different levels of phosphorus [0 (P(0)), 50 (P(1)), 100 (P(2)) and 150 (P(3)) mg kg(-1)] and humic acid [0 (HA(0)), 750 (HA(1)) and 1500 (HA(2)) mg kg(-1)] to growing media containing moderate salt dose (8 mM NaCl treatment) were studied. The study was replicated four times with 20 plants in each replicate. Humic acid (HA) and phosphorus applications increased the growth and growth parameter of plants. In company, effects of HA and P application was more effective on growth and growth parameter than each separate effect. The optimum total yield was obtained from 69 mg kg(-1) P application with HA2 doses according to regression analysis. Humic acid application significantly increased N, P, K, Ca, Mg, S, Mn and Cu contents of shoot of pepper seedling. Also, N, P, K, Ca, S, Fe, Mn, Zn and Cu contents of root were increased with humic acid application. Na contents of both shoot and root of pepper decreased with increased humic acid doses. It can be concluded that high humic acid doses has positive effects on salt tolerance based on the plant growth parameters and nutrient contents. The present study suggests that HA treatments can ameliorate the deleterious effects of salt stress on pepper plants and HA could offer an economical and simple application to reduce problems of pepper production in moderately saline soil.
Responses of Some Different Pepper (Capsicum Annuum L.) Genotypes To Inoculation With Two Different Arbuscular Mycorrhizal Fungi
(Elsevier Science Bv, 2007) Sensoy, Suat; Demir, Semra; Turkmen, Onder; Erdinc, Ceknas; Savur, Orcun Burak
Eight different pepper genotypes inoculated by two different arbuscular mycorrhizal fungi (AMF) [Glomus intraradices (Gi) and Gigaspora margarita (Gm)] in a growth chamber experiment under normal seedling growing conditions were evaluated for seedling traits, colonization and relative mycorrhizal dependency (RMD). In general, inoculated plants had greater dry weights compared to non-inoculated plants. Five cultivars responded positively to inoculation with AM fungi and three responded negatively. A great variation in mycorrhizal colonization dependency was observed among the pepper genotypes, with the N52 genotype showing the highest RMD and the Karaisali genotype the lowest. RMD and dry weights of pepper genotypes were inversely correlated. (C) 2007 Elsevier B.V. All rights reserved.
Sewage Sludge and Farmyard Manure Ratios in Growing Media Affect Nutrient and Heavy Metal Contents in Cucumber
(Parlar Scientific Publications (p S P), 2006) Sensoy, Suat; Turkmen, Onder; Cirka, Mustafa; Dursun, Atilla; Tufenkci, Serik
This study aimed to determine the effects of substituting sewage sludge for farmyard manure in seedling growing, media on the total dry weight, as well as nutrient and heavy metal contents of cucumber plants. Seedling growing, media consisted of 2:1:2 soil (S), pumice (P) and an organic fertilizer mixture [farmyard manure (FM) + sewage sludge (SS)]. Then, SS was progressively substituted for FM, at rates of 0%, 25 %, 50%, 75 %, and 100%. Treatments were placed in a growth chamber. No additional nutrients were applied. Dry weight, and Fe, Mn, B, Zn, Cu, Mo and Cd contents were found to increase with increases in SS ratios. Conversely, N, P, K, Ca, Mg and S contents increased with increases in FM ratios. Applications of 0:1 and 1:3 FM:SS ratios provided the best results based on dry weight of seedlings; however, when plant nutrient an heavy metal contents were taken into consideration, 1:1 and 3:1 FM:SS ratios were found to be preferable.
Toxic Effects of Excess Cu2+ and Zn2+ on Growth and Some Antioxidant Enzymes of Tomato (Solanum Lycopersicum L.)
(Parlar Scientific Publications (p S P), 2010) Bozkurt, Mehmet Ali; Sensoy, Suat; Celik, Ismail; Turkmen, Onder; Bitiktas, Ayseguel
The toxic effects of excess Cu2+ and Zn2+ doses on growth of tomato seedlings were studied in a pot experiment with the measurement of fresh and dry biomass of the plants. The toxic effects of both elements were evaluated by measuring copper and zinc accumulations, glutathione S transferase (GST) and superoxide dismutase (SOD) activities in tomato plants. The doses were 0, 150, 300, 450, and 600 mg kg(-1) of copper as well as 0, 250, 500, 750 and 1000 mg kg(-1) of zinc, and two separate pot experiments were conducted for these metals. The experimental results demonstrated that the excess Cu2+ and Zn2+ applications inhibited the growth of tomato seedlings and diminished their biomasses. The applications increased copper and zinc accumulations in the shoots and roots in comparison to control treatments. The accumulations were markedly higher in the roots than those in the shoots. The excessive Cu2+ amounts caused significant decreases in the GST and SOD activities of the roots. However, the SOD activities in the shoots significantly increased with excessive Cu2+ doses. The excessive Zn2+ applications significantly affected the GST activities in the shoots and the SOD activities in the roots. Both enzyme activities in the roots decreased with excessive Cu2+ and Zn2+ applications. This study shows that GST and SOD activities in tomatoes may be used as sensitive indicators of copper and zinc toxicity.
Variation in the Reaction of Lake Van Basin Melon Genotypes To Fusarium Oxysporum F.sp Melonis
(Friends Science Publ, 2012) Sensoy, Suat; Demir, Semra; Turkmen, Onder; Erdinc, Ceknas; Durak, Emre Demirer
The reaction to Fusarium oxysporum f. sp. melonis (F.o.m.) race 0 and 1;2 of fifty Cucumis melo L. genotypes collected from Lake Van Basin was determined by inoculating melon genotypes with sand culture of F.o.m. race 0 and 1,2, for the pathogenicity test. Melon seedlings were evaluated with two different scales based on disease incidence and vascular discoloration. The disease frequency on the 50 melon genotypes varied differently. It was found that although there were several resistant melon genotypes to F.o.m. race 0, most of the melon genotypes were found susceptible to F.o.m. race 1,2. (C) 2012 Friends Science Publishers
Variation of Salinity Tolerance in Bean Genotypes
(Academic Journals, 2011) Ciftci, Vahdettin; Turkmen, Onder; Dogan, Yusuf; Erdinc, Ceknas; Sensoy, Suat
Bean is among the very sensitive plant species to soil salinity. This study was carried out using the 55 bean genotypes collected from Gevas-Van region in Turkey to determine their salinity tolerance. This study aimed to investigate the salt tolerance capacity of this local bean population. 50 mM NaCl was applied to the bean seedlings, and the measurements and observations were done 20 days after the salt application, when the differences among the genotypes appeared. Number of leaves, seedling heights, and root and shoot weights and some nutrients (phosphorous, potassium, iron, calcium, manganese, magnesium, copper, zinc, and sodium) of the seedlings were determined. The wide variation at salt stress tolerance was observed in this population. The overall performances of local genotypes were better than the tried commercial cultivars.