6066

5675

كارشناسي ارشد

خاكشناسي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1389

هفده،136ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

امير حسين خوش گفتار منش، عبدالرضا حاجي پور

مجيد افيوني

21/4/90

ْآقافخر مير لوحي، مژگان سپهري

مهندسي كشاورزي

ID5675

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Effect of Low Molecular Weight Carboxylic Acids and Selected SyntheticChelates on Zinc Uptake and Translocation in Two Wheat Genotypes with Different Zinc Efficiency Shirin Haftbaradaran Shirin 7b@yahoo com Department of Soil Science College of Agriculture Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Dr A H Khoshgoftarmanesh amirhkhosh@cc iut ac ir Abstract Zinc deficiency is considered one of the most widespread problems of human malnutrition worldwide Zinc deficiency in humans results from diets that are low in bioavailable zinc Direct relationship between zinc deficiency in humans and low zinc levels in soils and food crops has been recognised recently Therefore one of the most important approaches for combating zinc deficiency is supplying Zn for crops via correcting Zn deficiency in soils But for increasing plant uptake of Zn the bioavailability of Zn in soil has to be increased Deficiency of Zn rarely results from a limitation in the total amount of soil zinc but it is almost always due to a shortage in readily plant available Zn Root exudates and organic acids released during decomposition of soil organic matter can affect the availability of zinc for plant uptake Although main form of zinc taken up by roots is divalent ion it is believed that zinc chelate complexes may also be taken up by plants Considering this suggestion the effect of addition of organic ligands into the soil on the bioavailability of Zn requires knowledge on the function of these ligands and the mechanism of their uptake by plant roots Thus this nutrient solution culture study was conducted to investigate the effect of some natural and synthetic chelates on zinc uptake and translocation in two wheat genotypes with different zinc efficiency Two wheat genotypes Triticum aestivum L Back Cross Rushan as zinc efficient and Kavir as zinc inefficient were exposed to two levels of zinc 10 and 100 M in the form of zinc sulphate and six different carboxylic acids citric tartaric oxalic salicylic ethylenediamin tetraacetic acid and L methionine in a nutrient solution The experiment was set up in a completely randomized factorial design each treatment contained three replicates Analysis of variance procedures were conducted with the PROC GLM procedure of SAS Mean separations were performed using Fisher s protected least significant difference LSD method at P 0 05 Results of this study showed that on the one hand the Kavir genotype had higher shoot and root dry matter shoot zinc uptake root Fe concentration and uptake shoot and root Cu uptake and root Mn uptake in comparison with the Back Cross Rushan genotype whereas the shoot Zn Fe and Mn concentrations were the lowest in the Kavir Back Cross Rushan genotype had the highest shoot Zn Fe and Mn concentrations On the other hand tartaric acid and citric acid caused the highest root Zn concentration and uptake in the Back Cross Rushan genotype while the lowest in the Kavir genotype The L methinine and oxalic acid also caused the highest shoot Cu and Fe concentrations in the Kavir genotype in comparison with other wheat genotypes studied The lowest shoot Cu and Fe concentrations were found in the Back Cross Rushan genotype According to the results of this study it could be concluded that the effect of organic acids on growth and uptake of different nutrients varied based on wheat genotypes This variation is dependent on the different functions of zinc efficiency in genotypes

امير حسين خوش گفتار منش، عبدالرضا حاجي پور

مجيد افيوني

ْآقافخر مير لوحي، مژگان سپهري