Browsing by Author "Koyuncu, MA"

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Change of Fat Content and Fatty Acid Composition During the Fruit Development Period in the Hazelnuts Tombul and Palaz Cultivars Grown in Ordu
(international Society Horticultural Science, 1997) Koyuncu, MA; Koyuncu, F; Bostan, SZ; Islam, A
Change of fat contents and fatty acids were analyzed during the fruit development period in the hazelnuts Tombul and Palaz cultivars. Palmitic acid in hazelnuts was the main saturated fatty acid followed by the stearic acid. The main unsaturated fatty acid in kernels of studied hazelnut cultivars was found to be oleic acid, followed by linoleic acid. But, linolenic acid was trace amount. Fat content has increased during the fruit development period and reached it's maximum at the date of harvest maturity. Palmitic (16: 0) and stearic (18: 0) acid contents have decreased at the beginning of the fruit development period (28.6.1995-12.7.1995) and then an important change have not occurred. Oleic (18:1) acid has increased regularly and reached maximum at the harvest date. Linoleic (18:2) acid has decreased parallel to the oleic (18:1) acid.
Compositional Changes of Fatty Acids During the Development of Kernel of Yalova-1 and Yalova-4 Walnut Cultivars
(international Society Horticultural Science, 2001) Koyuncu, MA; Yarilgac, T; Kazankaya, A; Koyuncu, F; Küçük, M; Sen, SM
Changes of oil contents and fatty acids composition during the development of kernels of Yalova-1 and Yalova-4 walnut varieties were investigated. Samples were taken from trees by 20 days intervals in this period and analysed. Oil contents of cultivars increased as parallel to the kernel development. These increases were statistically significant (P <0.05). Palmitic (16:0) and stearic (18:0) acid contents have decreased as kernels develop. The decreases of palmitic acid contents were statistically significant, but stearic (P <0.05). Oleic (18:1) acid increased regularly and reached maximum level at the harvest date. Linoleic (18:2) and linolenic (18:3) acid contents decreased during the fruit development period. The changes of these acid contents were statistically significant except linoleic acid of Yalova-4 (P <0.05).
Investigations on Some Physical and Chemical Characteristics in Fig Cultivars Grown in Ordu
(international Society Horticultural Science, 1998) Koyuncu, MA; Bostan, SZ; Islam, A; Koyuncu, F
This study was carried out in the Ordu plain (Turkey). It examined 6 different local fig cultivars viz. Agustos,Beyaz (Ak), Degirmen, Kara, Kus (Camas) and Pathcan. In these cultivars, fruit weight was determined between 11.35-58.00 g, fruit width between 3.10-5.25 cm, fruit length between 2.20-6.20 cm, pH between 4.2-5.3, total soluble solid contents between 16.6-20.0% and titratable acidity between 0.11-0.30%. The cultivars are mainly used for fresh consumption in Ordu.
Lateral Fruitfulness on Turkish Standard Walnut Cultivars and Promising Selections (Juglans Regia L.)
(international Society Horticultural Science, 2001) Sen, SM; Balta, F; Koyuncu, MA; Koyuncu, F; Yarilgac, T; Kazankaya, A
Included in the species Juglans regia L. in Anatolia with rather rich walnut populations from seed origin, there are a lot of walnut cultivars and promising selections with high nut quality and lateral fruit bearing characteristic. When compared to commercial walnut cultivars of the world, the results from studies carried out in different places of Anatolia such as Marmara Region, Northeast Anatolia Region, East Black Sea Region, Eastern Mediterranean Coastal areas, the districts Darende, Gurun, Tokat, Cameli, Bozkurt, Adilcevaz, Catak, Ahlat, Adiyaman, Sanliurfa, Mardin, Gevas, Ermenek, Posof, Ikizdere, Bahcesaray and Yalova until today can be said to be promising. The researches concerning some cultivars and selections currently continue. This paper deals with the results in relation to lateral fruitfulness and valuable fruit characteristics of the cultivars and promising selections from different areas of Anatolia.
Main Composition of the Fruits of the Hazelnuts 'tombul and 'palaz Cultivars Preselected in Carsamba and Terme (Samsun) Districts
(international Society Horticultural Science, 1997) Koyuncu, MA; Balta, F; Koyuncu, F; Balta, F
In this research, some main compositions and fatty acid composition of ten types belonging to preselected 'Palaz' and 'Tombul' cvs. in Carsamba and Terme districts of Samsun province were analyzed. Kernels of nuts gathered at the harvest period of 1995 were determined to have contained 3.97-5.04% moisture, 2.00-2.24% ash, 13.26-16.28% protein, and 54.24-61.67% total fat content. In addition, palmitic acid was the main saturated fatty acid (5.92-6.93%) followed by stearic acid (0.88-2.38). Also, the main monounsaturated fatty acid in kernels belonging to different types of two cultivars was oleic acid (70.38-84.38%). The analyzed kernels contained 8.25-21.37% linoleic acid and linolenic acid in trace amount, which are polyunsaturated fatty acids.
Promising Apricot Genetic Resources From the Lake Van Region
(Kluwer Academic Publ, 2002) Balta, F; Kaya, T; Yarilgaç, T; Kazankaya, A; Balta, MF; Koyuncu, MA
This study was conducted in order to select valuable genetic resources (Prunus armeniaca L.) of apricot in Gevas, situated on Lake Van Region (East Anatolia) of Turkey during 1998 and 1999. All population consisted of native apricot genotypes were examined with respect to fruit and tree characteristics for two years, and twenty-eight genotypes were selected for future breeding efforts. Their flowering habit and desirable fruit characteristics were determined in comparison with 'Hacihaliloglu'. All selected apricots grown at 1700 m in the region were not affected by late spring frosts. In the majority of genotypes, bud break, first flowering, full flowering and end of flowering occurred a few days earlier than the cultivar 'Hacihaliloglu' in both years, whereas, harvest was later than that. Some selections produced larger fruits than 'Hacihaliloglu'. All genotypes showed a range of 25-48 g for fruit weight, 11-21% for soluble solids and 0.19-2.90% for acidity. Soluble solids content was more than 20% in three selections (G12, G29 and G33), and the acidity was lower than 1% in five genotypes (G2, G12, G27, G29 and G33). Selections with attractive fruit colors had small to medium-sized fruits. Many genotypes were evaluated as promising for further breeding efforts.
Some Nut Properties of Walnuts (Juglans Regia L.) of Edremit Country
(international Society Horticultural Science, 2001) Kazankaya, A; Koyuncu, MA; Koyuncu, F; Yarilgac, T; Sen, SM
This study was carried out between 1997 and 1998 in Edremit. As a result of evaluations, 38 selections were regarded as promising. Most selections had fruit weights over 11-12 g, kernel weights over 6-7 g, kernel percents over 45 and light colored kernels.
Some Promising Walnut Selections (Juglans Regia L.)
(international Society Horticultural Science, 2001) Yarilgac, T; Koyuncu, F; Koyuncu, MA; Kazankaya, A; Sen, SM
This study was carried out in the district of Gevas located in the Lake Van Region (East Anatolia) between the years of 1995 and 1998. In the study, it was aimed to determine the promising walnuts and to preserve as valuable genetic sources (Juglans regia L.) within existing population, all of which consisting of seedling trees. Thus, walnut preselections on which initial observations and evaluations were done before were investigated for long time so that they could be better illustrated. As a result of observations for four years, valuable selections were studied, and they were regarded as promising. Selections had nut weight between 10.38 and 17.04 g, kernel weight between 5.85 and 7.88 g, shell thickness between 0.86 and 1.75 mm, kernel percentage between 45.09 and 59.27 %, oil content between 55.74 and 68.52 %, and protein content between 16.21 and 21.86 %. In addition, nut dimensions, kernel color, lateral pistillate flowering percentages, and flowering characteristics etc. were also evaluated.
A Study on Some Fruit Characteristics in Local Fig Cultivars Grown in Hilvan (Urfa, Southern Turkey)
(international Society Horticultural Science, 1998) Koyuncu, MA
This study was carried out on 9 different local fig cultivars grown in Hilvan (Urfa). In our research, the fruits were harvested acid analyzed during the ripening period in 1996. Some physical and chemical characteristics of cultivars were determined. Fruit weight was determined between 9.00-38.37 g, fruit width between 24.4843.60 mm, fruit length between 22.00-39.80 mm, pH between 4.71-5.54, total soluble solid contents between 11.9-24.30% and titratable acidity between 0.13-0.34%. In addition also skin color, internal (pedicel) color, peel thickness' acid skin cracks were investigated.