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  • Author or Editor: I. BAŞER x
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This research was conducted to determine the effect of genetic and phenotypic variability on the yield and yield components of some bread wheat varieties over a period of four years (1995–1998). Experiments were established according to a completely randomised block design with three replicates in the Experimental Field of Tekirda đ Agricultural Faculty, Thrace University. In the present research, genotypic and phenotypic variability, heritability and phenotypic correlation coefficients were estimated for plant height, spike length, number of spikelets per spike, number of spikes per square metre, thousand kernel weight, test weight and grain yield per hectare. The results of data analyses showed that the highest genotypic variability was obtained for per hectare yield, whereas the highest phenotypic variability values were found for plant height, thousand kernel weight and grain yield. For plant height, thousand grain yield and test weight, the broad sense heritability coefficient was found to be the highest, while it was low for spike length, number of spikelets per spike and number of Key words: bread wheat, genotypic variability, phenotypic variability, heritability coefficient, phenotypic correlation, grain yield

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Received: 14 February, 2000; accepted: 29 August, 2000 In this research, three bread wheat varieties were sown at six different plant densities in the experimental field of Tekirda đ Agricultural Faculty according to a split-plot randomised block design. A range of characters such as number of tillers per plant, number of spikes per plant, grain weight of tillers per plant, plant height, harvest index, plant yield and grain yield per hectare were investigated. The results of variance analysis showed that the effects of sowing rate and variety and their interaction on number of tillers per plant, plant height and grain yield per hectare were all significant. In addition, the effect of plant density on grain weight per tillers, grain yield per plant and number of spikes per plant was significant, whereas the effect of variety was only significant on harvest index. It was found that the number of fertile tillers per plant was the most suitable character as a selection criterion for improving grain yield in the Thrace Region. According to path analysis the direct and indirect effects of the measured characters on grain yield per plant and grain yield per hectare showed that the number of spikes per plant, harvest index, grain weight of tillers per plant and plant height had a direct positive effect on grain yield per plant. However, the number of spikes per plant and the number of tillers per plant had a negative effect on grain yield per hectare, while the harvest index and grain yield per plant had a positive direct effect.

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Authors: O. Bilgin, H. Orak, K. Korkut, İ. Başer, A. Orak and A. Balkan

The interrelationships among the grain protein, oil, fatty acids, starch, Na, K, Fe concentrations and chemical grain characteristics were determined by correlation analyses in thirty-five commercial dent corn hybrids. An increase in oil content of the corn is accompanied by a decrease in starch content and by an increase in caproic acid content. The correlation coefficients involving protein content of corn hybrids with oil content ( r = 0.066) and with saturated fatty acid (SFA) ( r = −0.247*) evidence that protein content is more related to fatty acid distribution than the oil quantity. Linear relationships between refractive index (RI) (nD40 °C) and saturated fatty acid ( r = 0.369**) and between refractive index and oleic acid ( r = 0.364**), and between iodine number (IN) and unsaturated fatty acid (UFA) were determined. In addition, oleic acid is strongly correlated with linoleic ( r = −0.769**) and linolenic acids ( r = −0.335**).

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