NaC l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

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

在NaC l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;NaC l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。

Comparison of the activities of protective enzymes, contents of osmotic adjustment substances and photosynthetic characteristics was made between grafted and self-root tomato （Lycopersicon esculenturn 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.