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Papers by Mucahit Taha Ozkaya

Research paper thumbnail of Effects of Cutting Size, Rooting Media and Planting Time on Rooting of Domat and Ayvalik Olive (Olea europaea L.) Cultivars in Shaded Polyethylene Tunnel (Spt)

Domat (difficult to root) and Ayvalık (easy to root) are important olive cultivars for green tabl... more Domat (difficult to root) and Ayvalık (easy to root) are important olive cultivars for green table olives and olive oil respectively in Turkey. This research was carried out to obtain ready to sale nursery plants of Domat and Ayvalık. It was achieved rooting their cuttings in different sizes and under different media and taken in different times of the crop year in Shaded Polyethylene Tunnels (SPT). Cuttings were prepared in three sizes:

Research paper thumbnail of Molecular Characterization of Some Selected Wild Olive ( Olea oleaster L.) Ecotypes Grown in Turkey

The wild olive subspecies oleaster called "Karadelice" in Turkish is a small tree or bush of rath... more The wild olive subspecies oleaster called "Karadelice" in Turkish is a small tree or bush of rather irregular growth, with thorny branches and oppositely positioned oblong pointed leaves, dark grayishgreen on the leaf surface and, in the early growth state, hoary on the lower surface with whitish scales. Generally, it is used as a dwarf rootstock; however, it has some grafting incompatibility with certain important olive cultivars. Some wild olive plants were selected from the village Kayadibi, 20 km distant from the city of İzmir in Turkey. This region is a very unique place for this type of wild olive. These ecotypes were differentiated by molecular markers using RAPD-PCR. Since they can be used as a dwarf rootstock, the correlations with some important olive cultivars were analyzed. For that reason Ayvalık cv, which is the most important olive cultivar for olive oil production was used primarily. Since Ayvalık cv and KD-8 are 97% similar, it was expected that they may have grafting compability. In the second part of the study, the comparison were done with Memecik and Tavşan Yüreği cultivars which are important olive oil and table olive cultivars, respectively. Since Memecik and Tavşan Yüreği were 100% similar therefore, it was considered that they may have more grafting compability with oleasters KD-3 and KD-8. Both studies were carried out to find similarities in 9 olive oleasters growing at Kayadibi of İzmir province which are said to have confused and low level morphologic variations in their features.

Research paper thumbnail of Morphological and molecular characterization of Derik Halhali olive ( Olea europaea L.) accessions grown in Derik–Mardin province of Turkey

Scientia Horticulturae, 2006

The present study was undertaken to validate phenological and morphological differences in the cv... more The present study was undertaken to validate phenological and morphological differences in the cv. Derik of Mardin province through the use of RAPD markers. The study aimed to examine the relationships between accessions considered to represent cv. Derik Halhali and identify the most closely linked one. The results showed that the Derik Halhali accessions collected from Derik-Mardin province differ at various degrees from the standard Derik Halhali cultivar maintained at Olive Research Institute, Izmir, Turkey. This classification based on RAPD markers could not be related to known morphological information about the accessions. #

Research paper thumbnail of Oxidation Stability of Virgin Olive Oils from Some Important Cultivars in East Mediterranean Area in Turkey

Journal of The American Oil Chemists Society, 2009

Some important olive cultivars (Kilis yaglık, Halhalı, Karamani, Haşebi, Nizip yaglık) in East Me... more Some important olive cultivars (Kilis yaglık, Halhalı, Karamani, Haşebi, Nizip yaglık) in East Mediterranean Area were studied. Olive fruits were processed on a low-scale mill equipped with a basket centrifuge. Basic quality parameters, the content of total polyphenols, o-diphenols, oxidation stability (Rancimat) and antiradical activity [1,1-diphenyl-2-picrylhydrazyl (DPPH)] were determined in oil samples. The highest induction period (IP) was 36.42 h, found in the Halhalı cultivar (from Gaziantep province), which also had strong radical scavenging activity (RSA) (96.72% in methanol:water extract and 94.91% in total oil) in all samples. The total phenol and o-diphenol content for this cultivar were 495.42 and 76.89 mg caffeic acid/kg oil, respectively. The oxidation stability and antiradical activity of the Kilis yaglık cultivar (from Kilis province) was very poor when compared to other cultivar (IP; 10.40 h, RSA in methanol: water extract; 30.94%, RSA in total oil; 52.31%). In addition total phenol and o-diphenol content for this cultivar were 38.31 and 5.03 mg caffeic acid/kg oil, respectively.

Research paper thumbnail of Effects of Cutting Size, Rooting Media and Planting Time on Rooting of Domat and Ayvalik Olive (Olea europaea L.) Cultivars in Shaded Polyethylene Tunnel (Spt)

Domat (difficult to root) and Ayvalık (easy to root) are important olive cultivars for green tabl... more Domat (difficult to root) and Ayvalık (easy to root) are important olive cultivars for green table olives and olive oil respectively in Turkey. This research was carried out to obtain ready to sale nursery plants of Domat and Ayvalık. It was achieved rooting their cuttings in different sizes and under different media and taken in different times of the crop year in Shaded Polyethylene Tunnels (SPT). Cuttings were prepared in three sizes:

Research paper thumbnail of Molecular Characterization of Some Selected Wild Olive ( Olea oleaster L.) Ecotypes Grown in Turkey

The wild olive subspecies oleaster called "Karadelice" in Turkish is a small tree or bush of rath... more The wild olive subspecies oleaster called "Karadelice" in Turkish is a small tree or bush of rather irregular growth, with thorny branches and oppositely positioned oblong pointed leaves, dark grayishgreen on the leaf surface and, in the early growth state, hoary on the lower surface with whitish scales. Generally, it is used as a dwarf rootstock; however, it has some grafting incompatibility with certain important olive cultivars. Some wild olive plants were selected from the village Kayadibi, 20 km distant from the city of İzmir in Turkey. This region is a very unique place for this type of wild olive. These ecotypes were differentiated by molecular markers using RAPD-PCR. Since they can be used as a dwarf rootstock, the correlations with some important olive cultivars were analyzed. For that reason Ayvalık cv, which is the most important olive cultivar for olive oil production was used primarily. Since Ayvalık cv and KD-8 are 97% similar, it was expected that they may have grafting compability. In the second part of the study, the comparison were done with Memecik and Tavşan Yüreği cultivars which are important olive oil and table olive cultivars, respectively. Since Memecik and Tavşan Yüreği were 100% similar therefore, it was considered that they may have more grafting compability with oleasters KD-3 and KD-8. Both studies were carried out to find similarities in 9 olive oleasters growing at Kayadibi of İzmir province which are said to have confused and low level morphologic variations in their features.

Research paper thumbnail of Morphological and molecular characterization of Derik Halhali olive ( Olea europaea L.) accessions grown in Derik–Mardin province of Turkey

Scientia Horticulturae, 2006

The present study was undertaken to validate phenological and morphological differences in the cv... more The present study was undertaken to validate phenological and morphological differences in the cv. Derik of Mardin province through the use of RAPD markers. The study aimed to examine the relationships between accessions considered to represent cv. Derik Halhali and identify the most closely linked one. The results showed that the Derik Halhali accessions collected from Derik-Mardin province differ at various degrees from the standard Derik Halhali cultivar maintained at Olive Research Institute, Izmir, Turkey. This classification based on RAPD markers could not be related to known morphological information about the accessions. #

Research paper thumbnail of Oxidation Stability of Virgin Olive Oils from Some Important Cultivars in East Mediterranean Area in Turkey

Journal of The American Oil Chemists Society, 2009

Some important olive cultivars (Kilis yaglık, Halhalı, Karamani, Haşebi, Nizip yaglık) in East Me... more Some important olive cultivars (Kilis yaglık, Halhalı, Karamani, Haşebi, Nizip yaglık) in East Mediterranean Area were studied. Olive fruits were processed on a low-scale mill equipped with a basket centrifuge. Basic quality parameters, the content of total polyphenols, o-diphenols, oxidation stability (Rancimat) and antiradical activity [1,1-diphenyl-2-picrylhydrazyl (DPPH)] were determined in oil samples. The highest induction period (IP) was 36.42 h, found in the Halhalı cultivar (from Gaziantep province), which also had strong radical scavenging activity (RSA) (96.72% in methanol:water extract and 94.91% in total oil) in all samples. The total phenol and o-diphenol content for this cultivar were 495.42 and 76.89 mg caffeic acid/kg oil, respectively. The oxidation stability and antiradical activity of the Kilis yaglık cultivar (from Kilis province) was very poor when compared to other cultivar (IP; 10.40 h, RSA in methanol: water extract; 30.94%, RSA in total oil; 52.31%). In addition total phenol and o-diphenol content for this cultivar were 38.31 and 5.03 mg caffeic acid/kg oil, respectively.