硅对NaCl胁迫下玉米幼苗生理特性的影响

采用水培法研究盐胁迫下不同浓度硅对玉米幼苗生长、叶绿素含量、保护酶活性等生理特性的影响。结果表明,适量的硅(1mmol/L)能有效促进玉米生长,抑制叶绿素含量降低,降低细胞膜透性,提高玉米叶片和根系中的SOD、CAT和POD活性。叶片中SOD、CAT、POD活性均以Na2SiO3浓度为1mmol/L时活性最强;根系中三种酶活性以Na2SiO3浓度为2mmol/L时最强,表明硅对叶片和根系中的酶活性调控并非完全同步,也可能是硅在叶片和根系中作用途径不同所致。

Effect of Silicon on Protective Enzymes Actives Physiological Characteristics of Maize Seedling under Salt Stress

A solution culture was conducted to study the effects of silicon(Si) on the maize growth, chlorophyll content and the actives of several protective enzymes physiological characteristics were investigated. The results showed that the Na₂SiO₃ concentration at 1 mmol/L could obviously increasing in plant growth and restrain the decrease of chlorophyll content reduced permeability of cell membrane, and enhance SOD, CAT and POD activity in leaves and roots. When the concentration of Na₂SiO₃ at 1 mmol/L, the SOD, CAT and POD activity in leaves were highest, while the enzymes actives highest in the roots when the concentration of Na₂SiO₃ at 2 mmol/L. The results showed that the regulation and control of silicon to leaves and roots were not in synchronization. This may be the results of different way of different function of silicon in leaves and roots.