Iron-Stress in Tomato (Lycopersicum esculentum cv. Rutgers) Results in Increased Iron Reduction on the Root Plasma Membrane
Roots of tomato plants were grown for 21 days in complete hydroponic nutrient solution including Fe3+-chelate EDDHA and subsequently switched to nutrient solution withholding Fe for 4 to 5 days to induce iron stress. The iron-stressed plants reduced chelated Fe (measured as ferrozine complex) at rates 7-fold higher than those of roots of plants grown in Fe-sufficient conditions. The response in Fe-deficient plants was localized to root hairs which developed on secondary roots during the period of Fe stress.