Yazar "Gunduz, Kazim" seçeneğine göre listele
Listeleniyor 1 - 20 / 27
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Antioxidant activities and fatty acid composition of wild grown myrtle (Myrtus communis L.) fruits(Pharmacognosy Network Worldwide, 2010) Serce, Sedat; Ercisli, Sezai; Sengul, Memnune; Gunduz, Kazim; Orhan, EmineThe fruits of eight myrtles, Myrtus communis L. accessions from the Mediterranean region of Turkey were evaluated for their antioxidant activities and fatty acid contents. The antioxidant activities of the fruit extracts were determined by using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and beta-carotene-linoleic acid assays. The fatty acid contents of fruits were determined by using gas chromatography. The methanol extracts of fruits exhibited a high level of free radical scavenging activity. There was a wide range (74.51-91.65%) of antioxidant activity among the accessions in the beta-carotene-linoleic acid assay. The amount of total phenolics (TP) was determined to be between 44.41-74.44 mu g Gallic acid equivalent (GAE)/mg, on a dry weight basis. Oleic acid was the dominant fatty acid (67.07%), followed by palmitic (10.24%), and stearic acid (8.19%), respectively. These results suggest the future utilization of myrtle fruit extracts as food additives or in chemoprevention studies.Öğe ANTIOXIDANT, PHYSICAL AND CHEMICAL CHARACTERISTICS OF CORNELIAN CHERRY FRUITS (Cornus mas L.) AT DIFFERENT STAGES OF RIPENESS(Wydawnictwo Akad Rolniczej W Lublinie, 2013) Gunduz, Kazim; Saracoglu, Onur; Ozgen, Mustafa; Serce, SedatThere has been growing interest for less utilized fruit species lately. Cornelian cherry is one of these species with significant antioxidant characteristics. In this study, several, chemical properties and antioxidant characteristics of cornelian cherry fruits at four ripeness stages were evaluated. The stages were light yellow, blush, light red and dark red. Several fruit characteristics (fruit width, length, weight), total soluble solids (TSS), total titratable acidity (TA), sugar/acid ratio (TSS/TA), pH, fruit external color, total phenolic compounds (TPC), total antioxidant capacity (AOC) by trolox equivalent antioxidant capacity (TEAC), total monomeric anthocyanins (TMA) and tannins were evaluated. The stages were found to be significantly different for all factors evaluated. There was an overall increase in fruit width, length, weight, TSS, and SSC/TA over time, while TA averages decreased as the fruit matured. Fruit color progressively turned to dark red as anthocyanin accumulates. TPC and TEAC averages were similar at light yellow (8033 mu g gallic acid equivalent GAE . g(-1) fresh weight (fw) and 55.0 mu mol trolox equivalent (TE) . g(-1) fw) and reduced at the dark red stages (4162 mu g GAE . g(-1) fw and 7.8 mu mol TE . g(-1) fw). Tannin content decreased from 0.45 to 0.19% from light yellow to dark red stages.Öğe Antioxidant, physical and chemical characteristics of cornelian cherry fruits (Cornus mas L.) at different stages of ripeness(2013) Gunduz, Kazim; Saracoglu, Onur; Özgen, Mustafa; Serce, SedatThere has been growing interest for less utilized fruit species lately. Cornelian cherry is one of these species with significant antioxidant characteristics. In this study, several chemical properties and antioxidant characteristics of cornelian cherry fruits at four ripeness stages were evaluated. The stages were light yellow, blush, light red and dark red. Several fruit characteristics (fruit width, length, weight), total soluble solids (TSS), total titratable acidity (TA), sugar/acid ratio (TSS/TA), pH, fruit external color, total phenolic compounds (TPC), total antioxidant capacity (AOC) by trolox equivalent antioxidant capacity (TEAC), total monomeric anthocyanins (TMA) and tannins were evaluated. The stages were found to be significantly different for all factors evaluated. There was an overall increase in fruit width, length, weight, TSS, and SSC/TA over time, while TA averages decreased as the fruit matured. Fruit color progressively turned to dark red as anthocyanin accumulates. TPC and TEAC averages were similar at light yellow (8033 ?g gallic acid equivalent GAE · g-1 fresh weight (fw) and 55.0 ?mol trolox equivalent (TE) · g-1 fw) and reduced at the dark red stages (4162 ?g GAE · g-1 fw and 7.8 ?mol TE · g-1 fw). Tannin content decreased from 0.45 to 0.19% from light yellow to dark red stages.Öğe CHANGES IN CHEMICAL COMPOSITION, TOTAL PHENOLIC CONTENT AND ANTIOXIDANT ACTIVITIES OF JUJUBE (Ziziphus jujuba Mill.) FRUITS AT DIFFERENT MATURATION STAGES(Wydawnictwo Akad Rolniczej W Lublinie, 2014) Gunduz, Kazim; Saracoglu, OnurJujube (Ziziphus jujuba Mill.) fruit is an important medicinal plant in Turkey. Several characteristics of jujube fruit harvested at four maturation stages were evaluated. The maturation stages were classified by degree (%) of dark color formation on the fruit surface [Stage (S1), '1-10% (S2), 11-50% (S3), 51-100% (S4)]. Fruit weight, width, length, stone weight, flesh/stone ratio, total soluble solids (TSS), titratable acidity (TA), organic acids and specific sugars were determined. Total phenolic content (TPC) was measured along with antioxidant activity (AOC), determined by Ferric Reducing Ability of Plasma (FRAP) and Trolox Equivalent Antioxidant Capacity (TEAC). Results of the study showed that TSS increased from 12.8% to 18.3% from the S1 to the S4 fruit stage, respectively. The S3 had the highest TPC (6518 mg GAE. kg fw). The highest AOC were recovered from S2 (TEAC; 74.4 Amol TE. g fw, FRAP; 50.9 piano' TE. g fw), followed by S3 (TEAC; 63.6 Amol TE.g fw, FRAP; 37.6 Amol TE-g fw). The main organic acid was citric acid as determined by the HPLC method. Fructose content tended to be more stable than glucose or sucrose.Öğe Distribution of heavy metals in plant and media samples from a volcanic region in Hatay, Turkey(Parlar Scientific Publications (P S P), 2008) Demirkeser, Turan Hakan; Ozgen, Senay; Torun, Ayfer Alkan; Erdem, Halil; Gunduz, Kazim; Durgac, Coskun; Serce, SedatThere is a volcanic area in Hatay, Turkey with currently limited agricultural activities; however, its ecological properties make it a plausible choice for protected fruit and vegetable production. The different soil properties of the area might be useful for plant growing in the future. In this study, we determined selected plant nutrients and heavy metal concentrations of eight soil and rock types from the realon. along with those of ten different species of fruits and vegetables representing the region's flora and agricultural activities. We found significant differences in all the micronutrients and heavy metal concentrations among the media samples. Overall, the highest concentrations were recovered from growing media. For example, one medium had the highest concentrations of Cu, Cd and Zn. Similarly, the plant samples had significant differences in micronutrients and heavy metal concentrations. Almond leaf samples were in the highest mean groups for Mg, Na, Fe, Al and Cr, while cucumber had the highest values for Zn and Ni. The highest Pb levels were recovered from uncultivated olive. Comparisons of our results to those of others in the related literature indicated that only two of our results were above the accepted levels: the almond Fe and holy oak B concentrations. In conclusion, our samples from the volcanic area in Hatay were not dangerously contaminated with heavy metals, and utilization of this area for agricultural purposes poses no apparent threat.Öğe Earliness, yield, and fruit quality characteristics in low chill peach-nectarines: a comparison of protected and open area cultivation(Tubitak Scientific & Technological Research Council Turkey, 2021) Caliskan, Oguzhan; Bayazit, Safder; Gunduz, Kazim; Kilic, Derya; Goktas, SultanThis study was carried out to determine the effects of protected cultivation on the earliness, yield, and fruit quality characteristics of some low chill peach-nectarine cultivars grown in the eastern Mediterranean region of Turkey. Phenological observations, yield parameters, and fruit quality characteristics were investigated:The chilling durations as CH (chilling hours), CU (chilling unit), and heat accumulations were determined. The 'Astoria' cultivar reached the highest cumulative yield of 29.11 kg/tree and 38.72 t/ha, and fruit size was 131.89 g and 61.74 mm in protected cultivation. The CH and CU values under protected cultivation were 28% and 40% lower than in open area cultivation, respectively. The heat accumulation was 30% higher for G DIH30 in the protected cultivation. The results of this study revealed that low chill peach-nectarine cultivars grown in protected cultivation showed variable earliness, yield, and fruit quality depending on chilling duration and heat accumulation.Öğe Effect of harvest maturity on volatile compounds profiling and eating quality of hawthorn (Crataegus azarolus L.) fruit(Elsevier, 2021) Dursun, Ahmet; Caliskan, Oguzhan; Guler, Zehra; Bayazit, Safder; Turkmen, Dilek; Gunduz, KazimThe effect of maturity stage on fruit quality characteristics, sensory attributes and volatile composition was investigated in the most important hawthorn cultivar (Sultan). The fruit skin color was used as the maturity index for the classification of hawthorn considering their maturity stages as immature (green), mature (green-yellow) and over mature (yellow). The volatile organic compounds (VOCs) of hawthorn fruit at each maturity stage were analyzed by solid-phase micro-extraction (SPME) and gas chromatography-mass spectrometry (GC-MS). The results indicated that the quality traits of the Sultan cultivar were affected by the maturity stage. From immature to over mature stages, firmness and titratable acidity decreased whereas fruit size (weight, diameter and length), edible fruit ratio, pH and esters (butyl and hexyl hexanoates, hexyl and cis-3-hexenyl acetates) increased in Sultan cultivar. The highest amount of esters along with the occurrence of butyl butanoate was observed in over mature fruit in comparison with immature and mature ones. PCA analysis of volatile organic compounds separated successfully hawthorn fruit according to the maturity stages. The results showed that mature and over mature fruit were more preferred by panelists. Those fruit had the highest level of esters being responsible for strong fruit flavor, along with low pH and low fruit firmness compared to immature ones.Öğe The effects of genotype and altitude of the growing location on physical, chemical, and phytochemical properties of strawberry(Tubitak Scientific & Technological Research Council Turkey, 2018) Gunduz, Kazim; Ozbay, HakanThe effects of genotype and altitude of the growing location on physical, chemical, and phytochemical properties of strawberry fruits were investigated. Eight strawberry genotypes obtained from diverse breeding programs were selected. The genotypes were grown at three altitudes: in Antakya (117 m), Urumu (443 m), and Saksak (755 m). The results indicated that genotype and growing location had a significant impact on both physico-chemical and phytochemical characteristics. Genotypes explained 36%-51% of total variance for fruit weight (FW), total soluble solids (TSS), total acidity (TA), color incidence chroma (C), hue (V), citric acid, and total monomeric anthocyanin (TMA). Altitudes explained 23%-50% of total variance for color L, total phenolic content (TPC), glucose, fructose, and total sugar. The genotype effect was larger than that of the different altitude conditions for most of the physico-chemical and phytochemical component variables in the experiment, showing that breeding for fruit quality properties may be successful.Öğe The effects of genotype and growing conditions on antioxidant capacity, phenolic compounds, organic acid and individual sugars of strawberry(Elsevier Sci Ltd, 2014) Gunduz, Kazim; Ozdemir, EmineIn this study, the genotypic and environmental effects for bioactive compounds in strawberries were partitioned. 13 strawberry genotypes from diverse breeding programs were selected. The genotypes were grown in three growing conditions: greenhouse (GH), plastic tunnel (PT) and open-field (OF) for two growing seasons. The results indicated that the genotypes were significantly different for most of the characteristics tested except the ferric reducing ability assay (FRAP) and Trolox-equivalent antioxidant capacity assay (TEAC) in the second growing season, while the growing conditions were only significant for total phenolic content (TPC) and fructose and total sugar content in the first growing season. Genotype had 71% and 72% of the total variance for total monomeric anthocyanin contents (TMA), while it had only 12% and 13% of the variance for TPC in the first and second year of the experiment. Genotype effect was larger than that from the growing conditions for most of the bioactive component variables in the experiment indicated that breeding for bioactive components may be successful. (C) 2014 Elsevier Ltd. All rights reserved.Öğe Effects of Short Day Conditioning, Chilling and GA3 Treatments to Yield and Fruit Quality in Strawberry Plug Transplants Aiming Early Fruit Production(Univ Agr Sci & Veterinary Med Cluj-Napoca, 2013) Ozdemir, Emine; Kaska, Nurettin; Gunduz, Kazim; Serce, SedatIn this study, we tested the effects of short day (SD), chilling (Ch) and gibberalic acid (GA(3)) treatments on the yield and fruit characteristics of 'Camarosa' and 'Sweet Charlie' plug plants under a freeze-protected greenhouse in Mediterranean conditions for two growing seasons in 2006-2007 and 2007-2008. The treatments included control (ambient day length and temperature); SD (8 h days) and ambient temperature, SD + Chilling (Ch) (18/12 degrees C day/night temperatures); SD + Ch (10 degrees C); SD + Ch (2 degrees C); and, GA(3) (10 ppm applied to the plants in November). In each growing season, the plug plants were planted in mid-August using bag culture. Yield, fruit weight, firmness, total soluble solids (SS), titratable acidity (TA), and SS/TA ratio were investigated. Considerable amounts of early yield (March and April) were recovered from 'Sweet Charlie'; 116 and 72 g/plant in the first and second growing seasons, respectively. 'Sweet Charlie' also had consistently higher total yield than 'Camarosa' (457 vs. 400 g/plant in the 2006-2007 season and 446 vs. 406 g/plant in the 2007-2008 season). Treatment did not have a consistent effect on the fruit quality traits measured. The results indicated that although SD conditioning, Ch and GA(3) treatments may have an effect on the total and early yield of strawberries, these effects may be cultivar-dependent and further regulated by environmental factors. Therefore, we propose that low-chilling varieties be utilized for early fruit production that can initiate flower buds in warmer, longer days.Öğe Genotype by environment interactions and combining ability for strawberry families grown in diverse environments(Springer, 2017) Mathey, Megan M.; Mookerjee, Sonali; Mahoney, Lise L.; Gunduz, Kazim; Rosyara, Umesh; Hancock, James F.; Stewart, Philip J.Ten seedlings from 36 crosses representing eastern and western North American short day and remontant genotypes were evaluated in 2011 and 2012 in California, Michigan, New Hampshire and Oregon, for phenology, flower related traits, plant characteristics, fruit characteristics and fruit chemistry traits. There was significant variability among genotypes, locations and evaluation year for most of the characteristics; however, few genotype 9 location and genotype 9 year interactions were detected. General combining ability variance components were significant for all traits and greater than SCA variance components for peduncle length, total flowering weeks, flowering cycles, truss size, growing degree days for harvest data, remontancy, achene position, ease of capping, fruit weight, percent soluble solids, titratable acidity and soluble solids/titratable acidity. `Sarian' was identified as the best contributing parent for remontancy. Narrow-sense heritability estimates were moderate to high (0.33-0.78) for total flowering weeks, flowering cycle, truss size, remontancy, number of runners, fruit weight, pH, and titratable acidity. Having a better understanding of these attributes will provide breeders guidance on the most effective breeding strategies for incorporating superior traits from this germplasm into their programs.Öğe Influence of Leaf Water Content on the Prediction of Nutrient Stress in Strawberry Leaves using Chromameter(Friends Science Publ, 2018) Keskin, Muharrem; Sekerli, Yunus Emre; Gunduz, KazimChemical soil and plant tissue analyses require considerable amount of labor, time, and cost. Non-destructive prediction of nutrient stress from chromameters may save time and labor. Previous studies did not assess multiple nutrient stresses together with the effect of leaf water content (WC). The aim of this work was to investigate the effect of leaf WC on the prediction of leaf nutrient stress from leaf color. A commercial strawberry field with a significant amount of leaf color variability was selected in Hatay province of Turkey. Forty eight leaf samples with varying colors were collected. A hand-held chromameter was used for leaf color measurements in two color systems as L*a*b* and L*C*h degrees. Leaf WC was determined using oven drying method. Leaf nutrient contents of N, P, K, Ca, Mg, Mn, Fe, and Cu were obtained using chemical analysis. Correlation and Partial Least Square Regression (PLSR) methods were utilized for data analysis. Leaf WC ranged from 58.3 to 65.7%. High correlation existed between color parameters and N, Ca, and WC (|r|>0.66). Also, correlation was high between leaf WC and leaf N content (r=0.75), suggesting that the leaves with high WC had also high N content. Using color data, it was possible to predict leaf N content (R-2=0.66), Ca content (R-2=0.70), and WC (R-2=0.65). Using WC as a variable together with the color parameters slightly improved the model performance to predict strawberry leaf nutrient concentrations. (C) 2018 Friends Science PublishersÖğe INFLUENCES OF PRE-SOWING TREATMENTS ON THE GERMINATION AND EMERGENCE OF DIFFERENT MULBERRY SPECIES SEEDS(Univ Life Sciences Lublin, 2019) Gunduz, Kazim; Karaat, Firat Ege; Uzunoglu, Fulya; Mavi, KazimMorus genus includes more than 20 species, some of which are commercially important mulberries with different fruit color and shape. Even though the trees of those species are propagated by rooting of cuttings in practice, mulberry seeds are of importance for breeding studies and rootstock seedling propagation. For that reason, this study was conducted to improve the seed performance of four mulberry species by different pre-sowing treatments including; 3% KNO3, GA(3) at 500 ppm, organic priming with herbal tea brewed from marigold flowers petals and hydro priming Results of the parameters of emergence characteristics and seedling vigor were evaluated. According to the results that varied between different species and pre-treatments, since emergence percentage and time, and seedling vigor were improved by the treatments, it was concluded that pre-sowing applications, especially GA(3) and hydro priming, were beneficial in improving the seed performance of mulberry species included in the study.Öğe Molecular and pomological diversity among pomegranate (Punica granatum L.) cultivars in Eastern Mediterranean region of Turkey(Academic Journals, 2008) Durgac, Coskun; Ozgen, Mustafa; Simsek, Ozhan; Kacar, Yildiz Aka; Kiyga, Yelda; Celebi, Semih; Gunduz, KazimPomegranate (Punica granatum L.) is an important fruit species for Turkey where many cultivars are being cultivated. In this study, we determined the fruit characteristics and RAPD band patterns of six local cultivars from Hatay, Turkey. Our results demonstrated that there is a great level of morphological variation. The principle component analysis of 18 quantitative fruit characteristics revealed that fruit weight, aril number/fruit, peel color and soluble solids/acidity ratio are important traits for discriminating the cultivars tested. The UPGMA cluster of fruit characteristics indicated that 'Katirbasi' and 'Kan nari' were similar to each other and they were separated from rest of the cultivars. Twenty-two RAPD primers generated total of 106 reproducible bands 22% of which were polymorphic. The UPGMA dendrogram of RAPD data showed that 'Tatli nar' and 'Serife' were very closely related while 'incekabuk' is distinct from the other cultivars. As a result, discrepancies were detected between morphological and molecular data. Therefore, we confirmed that diversity among the fruit characteristics were not good indication of genetic relatedness while molecular tools are valuable to study such similarities.Öğe Morphological and phytochemical properties of Mahonia aquifolium from Turkey(2013) Gunduz, KazimMahonia aquifolium (Pursh) Nutt. is an important medicinal plant used as an ornamental plant in Turkey. We studied several morphological and phytochemical properties including fruit weight and dimensions, fruit soluble solid content, acidity, pH, total phenolic content, antioxidant activity and total monomeric anthocyanins capacities of four selected M. aquifolium accessions. Notable differences were detected among the accessions. On average, the fruit width and length were 8.4 and 10.2 mm, respectively. Fruit weight and seeds weight of accessions were between 2.9 and 7.3 g and 0.4 and 1.2 g. The total phenolic contents ranged from 5009.3 to 6646.8 ?g GAE/g fresh weight (fw) with an average of 5976.4 ?g GAE/g fw. Antioxidant activities, determined by Trolox equivalent antioxidant capacity, on average to 12.9 ?mol Trolox equivalent (TE)/g fw. Total monomeric anthocyanins, among the accessions tested ranged from 52.8 to 361.0 ?g cy-3-glu/g fw. The results indicated that M. aquifolium is good source phenol, anthocyanins and antioxidants; thus, it can be used in pharmacological and food industry due to its antioxidant properties.Öğe MORPHOLOGICAL AND PHYTOCHEMICAL PROPERTIES OF Mahonia aquifolium FROM TURKEY(Univ Agriculture, 2013) Gunduz, KazimMahonia aquifolium (Pursh) Nutt. is an important medicinal plant used as an ornamental plant in Turkey. We studied several morphological and phytochemical properties including fruit weight and dimensions, fruit soluble solid content, acidity, pH, total phenolic content, antioxidant activity and total monomeric anthocyanins capacities of four selected M. aquifolium accessions. Notable differences were detected among the accessions. On average, the fruit width and length were 8.4 and 10.2 mm, respectively. Fruit weight and seeds weight of accessions were between 2.9 and 7.3 g and 0.4 and 1.2 g. The total phenolic contents ranged from 5009.3 to 6646.8 mu g GAE/g fresh weight (fw) with an average of 5976.4 mu g GAE/g fw. Antioxidant activities, determined by Trolox equivalent antioxidant capacity, on average to 12.9 mu mol Trolox equivalent (TE)/g fw. Total monomeric anthocyanins, among the accessions tested ranged from 52.8 to 361.0 mu g cy-3-glu/g fw. The results indicated that M. aquifolium is good source phenol, anthocyanins and antioxidants; thus, it can be used in pharmacological and food industry due to its antioxidant properties.Öğe MORPHOLOGICAL CHARACTERIZATION OF SPONGE GOURD (Luffa aegyptiaca Mill.) GENOTYPES FROM THE EASTERN MEDITERRANEAN REGION OF TURKEY(Serbian Genetics Soc, 2021) Mavi, Kazim; Gunduz, Kazim; Uzunoglu, Fulya; Karaat, Firat EgeHaving wide range of genetic resources, Hatay is the largest sponge gourd producer of province of Turkey. This study was conducted to determine the status and morphological diversity of the livestock breeding with a field survey in the districts of Hatay Province. As a result of the survey, 34 genotypes were collected that thought to be morphologically different. When the distributions of genotypes were examined, the genotypes were selected from Arsuz (5 genotypes), Defne (7 genotypes), Samandag (1 genotypes), Antakya (5 genotypes), Dortyol (6 genotypes), Yayladagi (4 genotypes), Altinozu (4 genotypes), Payas (1 genotypes) and Erzin (1 genotypes). Two genotypes ('31 AN 03' and '31 AL 04') from which the seeds did not germinate were extracted from the morphological characterization studies. Thirty-two genotypes selected from Hatay with 3 genotypes obtained from Adana, South Korea, and China in total of 35 genotypes were compared in terms of 49 different morphological characteristics. Variations between the genotypes were not identified for the observations made on these 49 features regarding cotyledon color, stem shape, tendrils, leaf margin, growth habit, sex type and peduncle separation from fruit. As a result of analysis of basic components and cluster analysis based on morphological characterization features, genotypes were included in six different groups. However, the effect of the districts on which genotypes were collected on this grouping could not be determined.Öğe Phenotypic variability in a panel of strawberry cultivars from North America and the European Union(Amer Pomological Soc, 2015) Hancock, James F.; Callow, Peter W.; Mathey, Megan M.; Mackey, Ted; Gunduz, Kazim; Mookerjee, Sonali; Cai, LichunThe phenotypic diversity in 96 antique and modern strawberry cultivars from the European Union and North America was evaluated in Michigan and Oregon, in 2011 and 2012. A total of thirty-five fruit and developmental characteristics were measured. Significant differences (p < 0.05) were observed among cultivars and environment for most of the characteristics, although only a few significant genotype x environment interactions were found. Several cultivars were superior for multiple traits including 'Aromas' from California (size, glossiness, crop load and weeks of flowering), 'Allstar from the Mid-Atlantic States (glossiness, firmness, drip loss and soluble solids concentration), 'Florida Radiance' (external color, skin strength, size, drip loss and acidity), 'Gorella' from the European Union (skin strength, internal color and soluble solids concentration) and 'Melody' from the European Union (external color, skin strength and drip loss). No antique cultivars carried superior traits that were not found in modem cultivars. The data in these trials will be combined with DNA diagnostic tests to identify genes of importance for strawberry breeding.Öğe Phytochemical characterization of several hawthorn (Crataegus spp.) species sampled from the Eastern Mediterranean region of Turkey(Wolters Kluwer Medknow Publications, 2012) Caliskan, Oguzhan; Gunduz, Kazim; Serce, Sedat; Toplu, Celil; Kamiloglu, Onder; Sengul, Memnune; Ercisli, SezaiBackground: We evaluated the total phenolic content, antioxidant capacity as well as antioxidant activity of five Crataegus species (A1, A2, Y1, Y2, Y4 accessions of Crataegus aronia var. aronia; B2, B3, B5, B6, B7, B9, Y5 accessions of C. aronia var. dentata; B10 accession of C. aronia var. minuta; Y3 accession of Crataegus orientalis var. orientalis and A3 accession of Crataegus monogyna subsp. azarella). Materials and Methods: Antioxidant activity and total phenolic content of fruits were determined by -carotene bleaching and Folin-Ciocalteu assays. Antioxidant capacity was determined by using 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. Results: C. monogyna subsp. azarella had the highest total phenol, antioxidant activity and antioxidant capacity of 55.2 mg gallic acid equivalents (GAE)/g dry weight (DW), 81.9 and 31.2, respectively. C. aronia var. aronia was found to have the lowest total phenolic content (35.7 mg GAE/g DW). The antioxidant activities of fruit extracts increased in the order of C. orientalis var. orientalis < C. aronia var. minuta < C. aronia var. dentata < C. aronia var. aronia < C. monogyna subsp. azarella according to -carotene/linoleic acid assay. In recent years, C. aronia var. dentata has gained importance as a commercial species in this region. B3 and B7 accessions had fruit weight more than 14 g, and considerable total phenol content, antioxidant activity and antioxidant capacity. Conclusion: This investigation shows the potential value of hawthorn fruit species as a good source of natural antioxidants and that consumption of hawthorn fruit or its products may contribute substantial amounts of antioxidants to the diet.Öğe Relationships among myrtle accessions from Turkey as revealed by fruit characteristics and RAPD(Ars Docendi, 2008) Serce, Sedat; Simsek, Ozhan; Gunduz, Kazim; Aka-Kacar, Yildiz; Ercisli, SezaiMyrtle, Myrtus communis L., is one of the most important and widespread shrubs (maquis) throughout the Mediterranean region. Its fruits ripen during the period of mid-fall to early winter and are generally dark-colored although while-colored wild forms rarely exist. In Turkey, both forms are present in addition to a while and large-fruited type, cultivated in small orchards and marketed locally. We studied two sets of myrtle accessions from Hatay, Turkey. Set I consisted of two wild accessions, dark- and white-colored forms, and six cultivated selections, while Set 2 contained three open-pollinated individuals from each accession of Set 1. We evaluated fruit characteristics of including fruit weight, width, length, soluble solids, pH and acidity. The accessions considerably differed in all the traits tested except for soluble solids. We also examined genotypic variation of Sets I and 2 using 26 RAPD primers and analyzed the data by cluster and principle components analyses. The results revealed that although some of the half-sib families (e.g., 8 a, b and c) were grouped based on their maternal parents, no overall pattern was apparent. These results suggest that myrtle pollination appeared to be not restricted to the self-pollination and the cultivated types have a narrow genetic base.
