Citric acid assisted phytoextraction of nickle from soil helps to tolerate oxidative stress and expression profile of NRAMP genes in sunflower at different growth stages oleh Munazza Ijaz, Mahmood-ur-Rahman Ansari, Hayat Ali Alafari, Muhammad Iqbal, Dalal S. Alshaya, Sajid Fiaz, Hafiz Muhammad Ahmad, Muhammad Zubair, Pia Muhammad Adnan Ramzani, Javed Iqbal, Asmaa M. Abushady, Asmaa M. Abushady, Kotb Attia, Kotb Attia