Nitrogen Enhances Leaf–Root Coordination of Hormonal, Redox, and Carbohydrate Metabolism to Improve Drought Tolerance in Calligonum mongolicum Seedlings - Abd Ullah; Akash Tariq; Fanjiang Zeng; Javaria Noor; Muhammad Ahsan Asghar; Jordi Sardans; Josep Peñuelas (Journal of Plant Growth Regulation, 2026)