Studies on Physiological Responses to Aluminum Stress of Plantago asiatica

Abstract:

In order to understand the physiological responses and mechanisms to aluminum stress in wild herb Plantago asiatica, the characteristics of osmotica, membranous peroxidation and protective enzyme system under aluminum stress were studied. The results showed that there were no significant effects on physiological indexes of P. asiatica treated with low concentration of aluminum. With increasing of aluminum concentration, the contents of proline, soluble sugar and soluble protein in leaves rose at first and then descended. Under high concentration of aluminum stress, the membrane permeability and MDA content of leaves increased significantly. When treated with 500 mg L^-1 Al³⁺ or above, the activities of SOD, CAT, POD in P. asiatica leaves increased significantly. Therefore, wild herb Plantago asiatica could start physiological protection mechanism to reduce harm by aluminum stress, showing strong resistance to aluminum.