NaCl胁迫对番茄嫁接苗保护酶活性、渗透调节物质含量及光合特性的影响

 在NaCl胁迫下, 对番茄嫁接苗和自根苗的保护酶活性、渗透调节物质含量及光合特性等进行了比较。结果表明, 番茄嫁接苗叶片超氧化物歧化酶( SOD) 、过氧化物酶( POD) 和抗坏血酸过氧化物酶(APX) 活性以及抗坏血酸(AsA) 含量均显著高于自根苗, 丙二醛(MDA) 含量显著低于自根苗; 嫁接苗叶片游离脯氨酸、可溶性糖和可溶性蛋白质含量均显著高于自根苗; NaCl胁迫抑制光合作用, 但嫁接苗仍表现出优势; 嫁接苗根系Na + /K+比值显著低于自根苗。以上结果表明, 嫁接苗耐盐性优于自根苗。

Effects of NaCl Stress on Activities of Protective Enzymes, Contents of Osmotic Adjustment Substances and Photosynthetic Characteristics in Grafted Tomato Seedlings

Comparison of the activities of protective enzymes,contents of osmotic adjustment substances and photosynthetic characteristics was made between grafted and self-root tomato(Lycopersicon esculentum Mill.)seedlings under NaCl stress.The results showed that activities of superoxide dismutase(SOD),peroxidase(POD),ascorbate-specific peroxidase(APX) and content of ascorbic acid(AsA) in leaves of grafted seedlings were significantly higher than those of self-root seedlings.Malondiadehyde(MDA) content in leaves of grafted seedlings was significantly lower than that of self-root seedlings.The contents of free proline,soluble sugar and soluble protein in the leaves of grafted seedlings were significantly higher than those of self-root seedlings.Photosynthesis was inhibited under NaCl stress,but the performance of the grafted seedlings was superior to that of self-root seedlings.The Na~ / K~ value in the roots of grafted seedlings was significantly lower than that of self-root seedlings.Base on these results,it could be concluded that the resistance to NaCl stress of grafted tomato seedlings was stronger than that of self-root seedlings.