Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 46 4 2015 12 22 Effect of drought stress and foliar application of iron oxide nanoparticles on grain yield, ion content and photosynthetic pigments in sesame (Sesamum indicum L.) Effect of drought stress and foliar application of iron oxide nanoparticles on grain yield, ion content and photosynthetic pigments in sesame (Sesamum indicum L.) 619 628 56811 10.22059/ijfcs.2015.56811 FA Mostafa Heidari Associate Professor, Department of Agronomy, Faculty of Agriculture, University of Shahrood, Iran 0000-0003-1083-3391 Maryam Goleg M. Sc. Student, Department of Agronomy, Faculty of Agriculture, University of Shahrood, Iran 0000-0003-1083-3391 Hadi Ghorbani Associate Professor, Department of Agronomy, Faculty of Agriculture, University of Shahrood, Iran Mehdi Baradarn Firozabadi Associate Professor, Department of Agronomy, Faculty of Agriculture, University of Shahrood, Iran Journal Article 2015 06 01 In order to study the effects of drought stress and foliar application of iron oxide nanoparticles on sesame plants, a field experiment was laid in Faculty of Agriculture, University of Shahrood in 2014. The design of experiment was in split plot with blocks completely randomized in three replicates. Drought stress, W<sub>1</sub>=7, W<sub>2</sub>=12 and W<sub>3</sub>=17 irrigation time, were randomized in main plots with four concentrations of foliar application of iron oxide nanoparticles, F<sub>1</sub> = 0, F<sub>2 </sub>= 0.5, F<sub>3 </sub>= 1 and F<sub>4 </sub>= 1.5 kg at 1000 l water, in sub-plots. Results showed that the interaction between drought stress andiron oxide nanoparticles had significant effect on grain yield, biomass, leafstomatal conductance, chlorophyll "b" and carotenoids content in leaves, and seed nitrogen. The results indicated that the highest grain yield and biomass were obtained at W<sub>1</sub>F<sub>3</sub>, stomatal conductance at W<sub>1</sub>F<sub>2</sub>, chlorophyll "b" at W<sub>1</sub>F<sub>4</sub>, carotenoids at W<sub>2</sub>F<sub>3 </sub>and seed nitrogen at the W<sub>3</sub>F<sub>3 </sub>treatments. Moreover, the number of branches per plant and the concentration of potassium in seeds were significantly affected by both treatments. However, phosphorus in seeds, and potassium and phosphorous in leaves remained unchanged under treatments. Number of seeds and seed weight per capsule decreased about 12.3 and 27.7%, respectively by worsening the drought condition from W<sub>1 </sub>to W<sub>3</sub>. In general, it can be stated that in the drought stress condition, foliar application of iron oxide nanoparticles about 1 kg per thousand liters of water improves the physiological characteristics of sesame and grain yield. In order to study the effects of drought stress and foliar application of iron oxide nanoparticles on sesame plants, a field experiment was laid in Faculty of Agriculture, University of Shahrood in 2014. The design of experiment was in split plot with blocks completely randomized in three replicates. Drought stress, W<sub>1</sub>=7, W<sub>2</sub>=12 and W<sub>3</sub>=17 irrigation time, were randomized in main plots with four concentrations of foliar application of iron oxide nanoparticles, F<sub>1</sub> = 0, F<sub>2 </sub>= 0.5, F<sub>3 </sub>= 1 and F<sub>4 </sub>= 1.5 kg at 1000 l water, in sub-plots. Results showed that the interaction between drought stress andiron oxide nanoparticles had significant effect on grain yield, biomass, leafstomatal conductance, chlorophyll "b" and carotenoids content in leaves, and seed nitrogen. The results indicated that the highest grain yield and biomass were obtained at W<sub>1</sub>F<sub>3</sub>, stomatal conductance at W<sub>1</sub>F<sub>2</sub>, chlorophyll "b" at W<sub>1</sub>F<sub>4</sub>, carotenoids at W<sub>2</sub>F<sub>3 </sub>and seed nitrogen at the W<sub>3</sub>F<sub>3 </sub>treatments. Moreover, the number of branches per plant and the concentration of potassium in seeds were significantly affected by both treatments. However, phosphorus in seeds, and potassium and phosphorous in leaves remained unchanged under treatments. Number of seeds and seed weight per capsule decreased about 12.3 and 27.7%, respectively by worsening the drought condition from W<sub>1 </sub>to W<sub>3</sub>. In general, it can be stated that in the drought stress condition, foliar application of iron oxide nanoparticles about 1 kg per thousand liters of water improves the physiological characteristics of sesame and grain yield. Drought stress Nano-iron nutrient elements physiological parameters sesame (oltan cultivar) https://ijfcs.ut.ac.ir/article_56811_58a1fe83b0459181b21f66b33a29c61f.pdf