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Cadmium (Cd) accumulation in durum wheat (Triticum durum L.) and its human transport with food chain is a major environmental issue worldwide. The research was based on a pot experiment conducted on fifteen durum wheat cultivars, grown on acid soil pH 5.2. The effect of application of two different lime form (lime1=CaO; Calcium oxide and lime2=CaCO3; limestone) and on shoot dry weight and shoot concentrations of cadmium (Cd). Durum wheat cultivars were grown in strongly acid soil pH 5.2 treated with control (lime0), lime1 (CaO3 g kg-1 soil), lime2 (5.36 g CaCO3) and Cd (5 and 10 mg kg-1 soil) and harvested after 62 days of growth under greenhouse conditions. Durum wheat cultivars without lime fertilization caused decrease in shoot growth, in all durum wheat cultivars and at high Cd treatment. On the other hand, application of lime to the soil resulted in an increase in dry matter yield at both Cd5 and Cd10 doses. While average shoot dry matter yield of lime0 conditions of cadmium 10 dose was 47 mg plant-1, this yield increased to 120 mg plant-1 in lime1 application and to 111 mg plant-1 in lime2 application. Shoot Cd concentrations of durum wheat varieties caused a statistically significant decrease with lime1 and lime2 applications, whereas lime0 and lime2 applications of Cd5 dose caused 46% and 30% decrease in average Cd concentrations, respectively. The results indicated that all durum wheat cultivars were more susceptible to both without lime and Cd toxicity as compared to lime treatment. Cadmium toxicity in the shoot was relieved by lime1 and lime2 treatment. The results indicate that lime protects plants from Cd toxicity in durum wheat cultivars.

In this study, the effect of foliar L-Histidine and Methinonin amino acid applications on grain cadmium (Cd) and zinc (Zn) uptake on durum wheat grown in soil contaminated with Cd was investigated. The research was carried out according to the randomized blocks design as a pot experiment in greenhouse conditions. In the experiment, Cd doses were applied as control (0 mg Cd kg-1) and (3 mg Cd kg-1). L-Histidine and Methionine amino acids were applied 7 times from the leaf after the start of flag leaf formation in wheat at 0.5 mM doses and harvested after the grain maturity was completed. According to the results obtained, the wheat grain dry matter yield in 3 mg Cd kg-1 polluted soil was 44.5 mg grain-1 in the control, while the dry matter weight was increased with the application of L-Histidine and Methionine from the leaves being 48 and 50 mg grain-1, respectively. It was determined that there were differences in grain Cd and Zn concentrations with the application of amino acids from the leaves at the dose of 3 mg kg-1 cadmium. When the grain Cd and Zn intakes were compared with the control, it was found that the grain Cd concentration decreased, and the Zn concentration increased as a result of the application of amino acids. The high amount of Cd in wheat can make it to the human body through the food chain and is known to cause serious health problems after a certain amount of accumulation. As a result of this study, it is seen that L-Histidine and Methionine are effective in reducing Cd in the grain, and these amino acids probably form a complex with Cd, resulting in less transport.

Bu çalışmanın amacı, yüksek Cd konsantrasyonuna sahip toprağa çinko (Zn) uygulamaları ile ekmeklik ve makarnalık buğdayın Cd alımına olan etkisini araştırmaktır. Çalışma sera koşullarında Zn noksanlığına sahip kireç içeriği yüksek bir toprakta tesadüf blokları deneme desenine göre dört tekerrürlü olarak gerçekleştirilmiştir. Denemede Cd uygulamaları 0 (Cd 0) ve 10 (Cd10) mg kg-1 Cd dozlarında uygulanmıştır. Çinko uygulamaları ise topraktan 0 (Zn 0) ve 10 (Zn 10) mg kg-1 Zn ile toprak + yapraktan (Zn10+3Y; Zn10+8Y) olacak şekilde yapılmıştır. Yapraktan Zn uygulamalarına sapa kalkma döneminde başlanmış ve haftada 1 defa olmak üzere 3 ve 8 defa yapraktan %0,1 dozunda ZnSO4.7H2O uygulaması yapılmıştır. Bitkiler tane olgunluk döneminde hasat edilmiş ve tanelerde Zn ve Cd konsantrasyonları belirlenmiştir. Elde edilen sonuçlardan topraktan ve toprak+yapraktan Zn uygulamaları ile ekmeklik ve makarnalık buğdayların tane Zn konsantrasyonlarında önemli artışların olduğu görülmüştür. Toprağa Cd uygulaması ile Karacadağ çeşidine göre Harran-95 çeşidinin tanesinde daha fazla Cd birikimi olduğu görülmüştür. Karacadağ çeşidinin kontrol koşullarında 31 μg kg-1 olan Cd konsantrasyonu, Cd 10 koşullarında 3.616 μg kg-1’e, Harran çeşidinin ise 70 μg kg-1 tane Cd konsantrasyonu Cd10 koşullarında 8.434 μg kg-1’e yükseldiği görülmüştür. Bununla birlikte, toprak, toprak + yapraktan Zn uygulamaları, makarnalık buğday çeşitlerinin tane Cd konsantrasyonlarını önemli ölçüde azaltmıştır. Haran-95 çeşidinin Cd 10 koşullarında 8.434 μg kg-1 olan tane Cd konsantrasyonu, Zn10 koşullarında 6.464 μg kg-1’a, Zn10+3Y koşullarında 7.932 μg kg-1’a, Zn10+8Y koşullarında ise 6.745 μg kg-1’a düşmüştür. Sonuçlardan makarnalık buğday çeşidinin ekmeklik buğday çeşidine göre topraktan daha fazla Cd aldığı görülmüştür. Bunun yanında topraktan ve yapraktan Zn uygulamaları ile makarnalık buğday çeşidinin Cd alımında daha fazla azalma olduğu görülmüştür.

Deficiency of sulphur (S) is an important limiting factor of plant growth for sustainable agricultural production. The decline in sulphur dioxide emission, decrease in S-containing fertilizer consumption due to the high cost of S-fertilizers, breeding of new high yielding species are the well known causes of S-deficiency. A greenhouse experiment was conducted to investigate the effects of several doses of K2SO4-S, CaSO4-S and elemental-S applied on growth, shoot dry matter yield, S and N concentrations of wheat cultivar. The experiments were conducted in three soils differed from available S concentrations. Effects of different S-treatments (0, 25, 50 and 100 mg S kg-1) and S-forms had significant effects on shoot dry matter yields of plants. Sulphur from different S-sources did not increase shoot S-concentrations in Eskisehir and Konya soils, but increase was significant obtained in the Harran soil. Shoot S-concentration in Harran soil for zero K2SO4 treatment was 0.09%, the values were 0.22, 0.26 and 0.27% respectively for 25, 50 and 100 mg kg-1 treatments. The results indicated significant effects of S-treatments on plant growth and yield mostly based on soil properties, especially the available S-levels