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The study was carried out under different drought/osmotic stresses (0.00 MPa-control, 0.25 MPa, 0.50 MPa, 0.75 MPaand 1.00 MPa applications) created by using PEG 6000 with 43 genotypes under laboratory, with 5 replications accordingto a split-plot experiment design. The genotypes constituted the main plots, and the drought/osmotic stress applicationsconstituted the sub-plots.In the study, seedling weight, root number, root length, root weight, shoot length, and shoot weight characters weredetermined. It was determined that drought stress applications caused statistically significant decreases in root and shootcharacters. Osmotic stress of, 1.00 MPa and 0.75 MPa caused statistically significant reductions in root and shoot characters.The results indicated that early and mid-early varieties were more tolerant to drought than the late varieties. AlthoughAglika, Anapo, Enola and Hamza varieties were outstanding for their root properties, while Maden, NKU Ergene andBezostaja-1 cultivars showed more appropriate shoot characteristics than other cultivars. Enola, Aglika, Bezostaja-1,NKU Ergene, Anapo, Hamza and Maden bread wheat varieties showed better growth characteristics under drought stressconditions in the study.

The study was carried out to evaluate yield components and some physiological quality traits for 30 durum wheat landraces(native and foreign originated) and 5 obsolete cultivars in Thrace ecological conditions. Experiments were set up inrandomized block design in 3 replicated during the 3 consecutive growing seasons. As a result of the analysis of variance,the differences between the averages of the genotypes for the traits were found to be statistically significant. This indicatedthat there may be enough variation for traits within landraces. The mean values of genotypes ranged between 2238 kg/ha-1and 3749 kg/ha-1 for grain yield, 98.8 cm and 135.3 cm for plant height, 6.04 cm and 8.88 cm for spike length, 26.6 and35.3 for the number of grains per spike, 0.988 g and 1.494 g for grain weight per spike, 36.1 g and 42.7 g for thousandgrain weight, 74.4 kg/hl-1 and 79.4 kg/hl-1 for test weight and 82.1% and 94.6% for vitreous grain percentage. AlthoughKahramanmaraş, Dicle, Boğacak, Sorgül, Ionia, Cyprus and Haurani were determined as promising populations for yieldand yield components, Siverek, Çanakkale, Tokat, Gaziantep, Yozgat and Urfa landraces had better physical quality. Theestimated coefficient of variation and broad sense heritability shifted from 3.9% to 24.52% and from 7.91% to 72.44%for the traits, respectively. Moderately high coefficient of variation, broad sense heritability a genetic advance for plantheight, spike length and vitreous grain percentage indicated that selection based on these traits will be more effective andaccomplished in the genetic material.

NKU Lider is a winter bread wheat (Triticumaestivum L.) variety, developed by Tekirdağ NamıkKemal University, Agricultural Faculty and registeredin 2016. The spike of the NKU Lider variety ismoderately long and dense, white, and awned. Grain isoval, semi hard and red color. NKU Lider is a mediumtallvariety, similar to Flamura 85 and Tekirdağ breadwheat varieties. Plant height is between 85 and 90cm depending on the growing conditions. NKU Lidervariety is a winter type, medium-early, resistant towinter hardiness, good tolerant to drought, high abilityof tillering and trashing, and since its wide adaptability,it can be grown safely not only in the Thrace-MarmaraRegion, but also in other wheat production areas ofour country.

The s tudy was carried out in the experimental area of the Field Crops Department, Faculty of Agriculture, NamikKemal University in the growing season of 2011-12. In the s tudy, grain yield and its components and some quality traitssuch as 1000 grain weight, wet gluten content, gluten index, sedimentation value and protein content were inves tigated.The results exhibited significant differences among the tes ted genotypes, for all s tudied characters except spike length,indicating genetic variation among them. The genetic variation was higher for grain yield and its components when comparedwith quality characteris tics. These differences show that the effects of increasing gamma irradiation are not sys tematicallynegative for plant height, while positive for all other characters in comparison with controls. In general, it is unders toodthat the highes t percent changes are achieved in 200 and 250 Gy of gamma radiation doses for yield components, whileare in 300-350 Gy for the quality characteris tics. The values of phenotypic coefficient of variation PCV were slightlyhigher than their corresponding values of GCV for all traits. Moderate es timates of genotypic coefficient of variation GCVwere obtained by grain yield (12.50%), gluten content (11.20%) and grain weight per spike (10.20%), respectively. Lowes timates of GCV (less than 10) were recorded for the other characters inves tigated. The h2 values ranged from 37.3%, forsedimentation value, and 86.6%, for plant height, while the values of GA% ranged between 0.09 and 593.0.5% at 10%selection intensity for grain weight per spike and grain yield, respectively. The high values of heritability coupled withhigh values of genetic advance (%) were recorded by plant height, indicates the importance of the additive gene effects,so, selection would be effective in early generations for the trait. The high values of heritability coupled with moderatevalues of genetic advance (%) for harves t index and gluten index indicate selection would be a delay in later generations.