Effect of gibberellic acid and titanium dioxide nanoparticles on growth, antioxidant defense system and mineral nutrient uptake in wheat oleh Hesham F. Alharby, Muhammad Rizwan, Azka Iftikhar, Khalid Mahmud Hussaini, Muhammad Zia ur Rehman, Atif A. Bamagoos, Basmah M. Alharbi, Muhammad Asrar, Tahira Yasmeen, Shafaqat Ali