硅对盐胁迫下不同基因型黄瓜幼苗生长和生理代谢的影响

研究了水培条件下硅对盐胁迫下2个黄瓜品种幼苗生长和生理代谢的影响。结果表明:硅缓解了盐胁迫对黄瓜幼苗生长的抑制作用,显著降低黄瓜叶片中丙二醛(MDA)含量,减轻了黄瓜叶片的膜脂过氧化程度,显著降低叶片的电解质渗透率;硅使盐胁迫下黄瓜幼苗叶片保护酶(SOD,POD,PPO)活性显著升高,IAA氧化酶活性显著下降;加硅使黄瓜叶片的脯氨酸含量明显降低,绿原酸含量明显增加。因此,硅参与了植物的代谢或生理活动,可减轻盐胁迫对黄瓜幼苗的伤害。

Effects of Silicon on the Growth and Physiological Metaboism of Different Genotypes of Cucumber Seedlings under Salt Stress

Two cucumber(Cucumis sativus L.)cultivars were grown in a hydroponics culture system to study the effects of silicon(Si)on the growth and physiological metabolism of seedling leaves under salt stress.The results showed that Si could relaxed the salt stress-induced growth inhibition in cucumber seedling,and markedly decreased the malondialdehyde(MDA)content in the leaves of both cultivars exposed to salinity which reduced the membrane lipid peroxidation of cucumber leaves under salt stress and the electrolytic leakage percentage in plant leaves.The activities of superoxide dismutase(SOD),peroxidase(POD)and polyphenoloxidase(PPO)in cucumber leaves increased significantly when Si was added to the salt-contained solution,and so the damage by salt stress on cucumber seedlings were alleviated.The results of the present study suggested that Si is involved in the metabolic or physiological metaboism in higher plants.