Introduction Drought stress and Zn deficiency are important factors affecting the quantity and quality of wheat. Zn deficiency reduces photosynthesis and disorders protein synthesis that the consequence of such process is the gathering of amino acids and amides, and disordering of carbohydrates metabolism. Besides, in such a condition, the length of plants and the size of leaves reduce due to changes in Auxin metabolism, especially Indole Acetic Acid (IAA). Drought stress reduces leaf size, cell division, plant growth, amount of photosynthesis, protein synthesis and chlorophyll content. Balance of plant hormones is affected by both of these factors. Among the compounds with zinc element, Zinc oxide is known from the US Food and Drug Administration as one of the safest and most integral components of Zinc. Nanoparticles have attracted much attention for their distinct characteristics that are unavailable in conventional macroscopic materials. Obviously, increasing of zinc availability and reducing of drought effects can play an effective role in improving the present situation.
Materials and Methods The present study was carried out using split plot experiment based on a randomized complete block design with three replications. Two factors of drought stress (irrigation at 90% of field capacity as non-stress condition, irrigation in 75% of field capacity as medium stress and irrigation in 50% of field capacity as severe stress) and application of zinc element (without treatment, spraying of 5 and 10 ppm of Nano Zinc Oxide and Zinc Oxide) were examined as factors of this study. In this study, parameters of Indole acetic acid, Abscisic acid, Gibberellic acid, Tryptophan, Amount of Zinc, Chlorophyll index, Protein, Total dry matter, Phytic acid, Proline, and Yield were measured.
Results and Discussion Results of variance analysis of field data revealed that zinc element application in stress conditions could improve a number of parameters of this study. The interactions