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    Determining total phenolics and antioxidant activity of selected Fragaria genotypes
    (Chemical Publishing Co., 2007) Özgen, M.; Serçe, S.; Gündüz, K.; Yen, F.; Kafkas, E.; Paydas, S.
    Strawberries are known to have high antioxidant properties. In present study, we determined total phenolics and antioxidant activity of a group of Fragaria genotypes representing the Turkish diploid strawberry genotypes, dominating cultivars and some selections and hybrids. The average total phenolic compounds and antioxidant capacities were highest in wild material 7914 ?g GAE/gfw and 70.2 ?mol TE/gfw, respectively. The average of total phenolic compounds for hybrids was the highest (2467 ?g GAE/gfw) and followed by selections (2395 ?g GAE/gfw) and varieties (2318 pg GAE/gfw). The values increased during the season progress. A similar trend was observed on antioxidant activity of selected strawberries. The antioxidant capacity in the wild material was detected more than 3 fold higher than the F. xananassa groups (70.2 vs. 19.9, 21.4, 21.1 ?mol TE/gfw). The present results showed that there is a great variability among the strawberry genotypes tested for total phenolic compounds and antioxidant capacities. Therefore, in addition to taste and aroma characteristics high antioxidant properties should be important for cultivar selection by consumers and breeders for healthy diet.
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    Evaluation of fruit firmness among the segregation population strawberries developed from ‘Ottoman’ × ‘Camarosa’
    (International Society for Horticultural Science, 2019) Serçe, S.; Gündüz, K.; Çürük, S.
    Turkish strawberry production has an increasing trend. ‘Ottoman’ is one of the Turkish strawberry genetic resources with unique horticultural attributes such as aroma content. However, fruit firmness of ‘Osmanlı’ is low. In this study, a segregation population having 340 individuals, produced from ‘Ottoman’ × ‘Camarosa’ were characterized for many horticultural traits for two years. The hybrids were grown in an annual hill cultural system with summer planting on an open field conditions and flowering and runnering dates were recorded. Flower and leaf characteristics were determined in December in both experimental years, while pomological traits of fruit width, length and weight, soluble solids, fruit firmness, fruit external and internal colors were determined periodically during the whole experiment. A great deal of diversity was recorded among the hybrids for the most of the traits evaluated. For example, fruit firmness ranged between 0.2 and 1.5 kg cm-2; while the ranges for soluble solids, total fruit number and yield were 4.0-15.0%, 2-192 and 11.9-1220.8 g, respectively. The data from two experimental years were compared using regression analysis. Except petiole length, leaf width and length, all other traits evaluated had statistically significant correlation between their two years (P=0.000-0.017). 78 individuals from this population were genotyped with 33 SSR primer pairs which had previously been proven to be informative for this population. © 2019 International Society for Horticultural Science. All rights reserved.
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    Flower bud formation in the strawberry (Fragaria × ananassa) planting materials grown on different locations
    (International Society for Horticultural Science, 2019) Şahin, E.; Gündüz, K.; Serçe, S.
    In strawberry production, the sustainability of the increasing trend and fulfilling the complete potential, expanding the harvesting period of has great importance. For this purpose, the better understanding of the flower bud formation in the strawberry cultivars from different background and determination of plating material types and planting dates are required. We investigated meristems coming from different locations (Amasya = high elevation and Antakya = low elevation) and sampled in four different dates (1 September, 15 September, 1 October and 15 October) using ‘Cal Giant–3’, ‘Camarosa’, ‘Festival’, ‘Kabarla’ and ‘Sweet Charlie’ cultivars; 2). During the investigation of the meristems, five plants of each of the high and low land locations’ mother, and daughter plants and plug planting material was observed. The plug planting materials produced in the low and high land locations were planted on the planting dates of 1 September, 15 September, 1 October and 15 October and the fruits were subjected to the pomological analyses for ‘Camarosa’ and ‘Festival’. The planting dates had statistically significant differences for ‘Festival’. Although there were some statistically significant differences among the pomological traits tested, constant patterns for all periods and cultivars resulted from either planting material type or planting dates was not recovered. The results indicated that to increase the early yield in strawberry production, studies targeting to identify cultivars with low chilling requirement which could form flower buds under less favorable conditions may result in more advantageous results. © 2019 International Society for Horticultural Science. All rights reserved.