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    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, Hakan
    The 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.
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    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, Kazim
    Chemical 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 Publishers
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    Some selected physico-chemical characteristics of wild and cultivated blackberry fruits (Rubus fruticosus L.) from Turkey
    (Ars Docendi, 2009) Yilmaz, Kadir Ugurtan; Zengin, Yasar; Ercisli, Sezai; Serce, Sedat; Gunduz, Kazim; Sengul, Memnune; Asma, Bayram Murat
    In this study, some selected physico-chemical properties such as fruit weight, fruit length, fruit width, total soluble solids (TSS), titratable acidity, TSS/acidity ratio, pH, total phenolic content, antioxidant activity and free radical scavenging capacity of 9 cultivated and 16 selected wild blackberry (Rubus fruticosus L.) genotypes grown in Turkey were investigated. The total phenolic content, antioxidant activity and free radical-scavenging capacity of blackberry cultivars and genotypes were determined by using Folin-Ciocalteu, beta-carotene bleaching and DPPH radical assays. The results showed that, average fruit weight and fruit dimensions were higher in cultivated blackberries than wild materials. However, TSS, acidity and pH values were higher in wild materials. The total phenolic contents of blackberry cultivars and wild genotypes were in a range of 584 (cv. Bartin) to 788 (cv. Chester) mg/100 g and 610 (Genotypr R2) to 1455 mg/100 g (Genotype R16), expressed as gallic acid equivalents (GAE), on afresh weight basis. Antioxidant activity of cultivated and wild growing blackberry fruits was found between 72.15 (cv. Arapaho)-89.75% (cv. Bursa 3) and 59.85 (R1)-87.42% (R10), respectively. The antioxidant activity of standard BHA was 85.07%. Different cultivars grown in same location consistently showed differences in antioxidant capacity. The results of this study outlines that the blackberry fruits tested are good sources of natural antioxidants.