Effect of iron chlorosis on some metabolic components in apple trees at Nobaria, Egypt

ABSTRACT

The study revealed that leaf Fe-chlorosis seems to cause a disturbance in nitrogen and carbohydrate metabolism in apple trees [Malus domestica, Borkh.] variety Delicious. Total and soluble nitrogen and total free amino acids increased significantly in chlorotic leaves, while insoluble nitrogen and protein were markedly decreased. Proline was not alterd between healthy and chlorotic leaves in both seasons. In comparison with chlorotic leaves, healthy ones had significantly higher levels of soluble sugars, polysaccharides and total available carbohydrates and consequently the C/P ratio was higher in healthy than in chlorotic leaves