车前对铝胁迫生理响应的研究

Studies on Physiological Responses to Aluminum Stress of Plantago asiatica

摘要:

为探讨车前（Plantago asiatica）对铝胁迫的耐受特性及生理机理，在不同铝浓度及胁迫时间下，对其叶片的渗透调节物质、膜脂过氧化程度和体内保护酶系统进行了研究。结果表明，低浓度铝处理对车前的生理指标无明显影响。随着铝浓度的升高，叶片脯氨酸、可溶性糖、可溶性蛋白质含量呈先升高后下降趋势，细胞质膜透性显著增大、MDA 含量显著增加。500 mg L^-1的Al³⁺ 处理，车前叶片的SOD、CAT、POD 活性均明显提高。因此，在铝胁迫下，野生草本植物车前能通过体内的生理保护机制来减少Al 胁迫，表现出较强的耐铝特性。

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.