Yazar "Vural, H" seçeneğine göre listele

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    Different approaches of the improvement process in some local okra varieties
    (International Society Horticultural Science, 2002) Duzyaman, E; Vural, H; Paroussi, G; Voyiatzis, D; Paroussis, E
    Eighteen selected okra genotypes of American, Indian, West African and Turkish origin were evaluated in the studies carried out in 1995 and 1997, including a diallel hybridisation in 1996. A data matrix was prepared of 15 morphological and agronomical plant characters of interest, and subjected to `Principal Component' analysis for proper data reduction. 'Average Linkage Cluster Analysis' was then applied, and an eco-geographic specific clustering pattern among genotypes could be established: The similarities between Turkish and West African okras, approved that Turkish okras originated from that continent. Since Indian genotypes were classified as the most differing okra types from the Turkish okras, Indian germplasm was thought to be promising in serving as a new tool in the improvement of local okras. Based on the results of cluster analysis, a hybridisation process in a diallel manner was undertaken by including the most diverse genotypes. Heterotic effects over better parent were especially observed in hybrids between interclustering genotypes, such as between Indian, USA or Turkish genotypes. More evidence on the origin of Turkish okras was obtained from a hybrid between a West African and a Turkish okra parent, which produced fruits completely similar to another Turkish okra genotype.
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    Evaluation of pod characteristics and nutritive value of okra genetic resources
    (International Society Horticultural Science, 2003) Duzyaman, E; Vural, H; Duzyaman, E; Tuzel, Y
    Numerous okra genotypes of American, African, Indian, European and Turkish origin were examined for their pod properties and nutritive contents. Pod thickness was considerably high in the genetic material from Africa with up to 2.84 cm in diameter in the case of line 1051 from Togo. However, pods of the improved cultivars from the USA and India had a more attractive appearance with diameters varying between 1.15-1.50 cm. The improved cultivars from the USA could also be judged as to have slow fibre development. Dry matter accumulation was higher in the Turkish and African material, varying between 18.15-17.2% in the better one's, while this remained between 15.6-13.6% in the Indian material, and 14.4-11.7% in the USA material. Three lines from Turkey had top protein levels up to 4.55, 4.43 and 4.41% in the case of Bah Trakya, Akkoy and Denizli, respectively. Since okra is an important protein source in most developing countries, the material form Turkey might be extensively explored for its nutritive contents.
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    Improving productivity of open-pollinated processing tomato cultivars
    (Amer Soc Horticultural Science, 2005) Duman, I; Duzyaman, E; Esiyok, D; Vural, H; Erkan, S
    In contrast to developed countries open-pollinated (OP) processing tomato cultivars still have a certain market value in Turkey. A total of 26 subpopulations of 6 different OP cultivars (9 of Rio Grande, 5 of Rio Fuego, and 3 of each of C-37, Interpeel, T2 Improved, and VF 6203) were evaluated in two experimental sites in Marmara Region and Aegean Region. A high degree of phenotypic variance for yield (kg/plant) was found for most subpopulations which revealed the variation for yield amongst individuals, and hence the possibility to select for superior plants. Eighteen populations were developed by two cycles of mass selection conducted within the initial populations in both regions. Most progeny populations significantly exceeded their source cultivars in yield. Heritability estimates occurred generally parallel to that of yield increases of the progenies, which were slightly higher in the Karacabey trial (Marmara Region) as compared to the Muradiye trial (Aegean Region). Results were discussed from the point of view of the resource-poor farmers conducting low-input agriculture.
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    Managing the variability in okra breeding programs by considering the preferences of the domestic market
    (International Society Horticultural Science, 2003) Duzyaman, E; Vural, H; Duzyaman, E; Tuzel, Y
    Two field experiments were conducted to collect data on yield, yield components, plant morphology characteristics and some basic pod quality characteristics. Data were subjected to factor analysis to work out the relationship among variables. Pod characteristics such as pod weight and diameter positively affected total yield, both characteristics less determinative as consumer preferences in the domestic market. Total yield was also highly and negatively related to early flowering behaviour; however, early flowering behaviour might also be integrated to local okras due to the high market prices in the early season. Vegetative plant structures such as final plant height, height of lateral branches and internodes length had no connection to pod yield, implying that selection for semi-dwarf plant structure would not disturb final plant yield.