铝钙复合作用对杉木幼苗抗氧化能力的影响

采用水培法研究了铝钙复合作用对1年生杉木幼苗叶片丙二醛(MDA)含量和超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)3种抗氧化物酶活性的影响。结果表明:高铝浓度(1.5 mmol·L~(-1))胁迫下,增加钙离子浓度可以明显降低杉木幼苗叶片MDA含量,增强SOD、CAT、POD活性,且增强效应随培养时间的延长而愈加明显;在高钙浓度(4.5 mmol·L~(-1))处理下,随着铝浓度的上升,幼苗叶片MDA含量升高,SOD、CAT活性下降,而POD活性变化却不明显。高铝浓度胁迫下杉木幼苗受毒害程度较大,而在高钙浓度下铝毒对杉木幼苗影响相对减弱;钙离子对杉木幼苗铝毒具有一定程度的缓解作用。

Synergistic effects of aluminum and calcium on antioxidant activities of Cunninghamia lanceolata seedlings

The synergistic effects of aluminum and calcium on the malondialdehyde(MDA) content and ant1ox1dtant enzyme activities such as superoxide dismutase (SOD),catalase (CAT) and peroxidase (POD) of one-year-old Cunninghamia lanceolata seedling leaves were studied by solution culture method.The results indicated that the increase of the calcium ion concentration significantly reduced the MDA content and raised SOD,CAT,POD activities under the high aluminum stress,and the effect was more obvious with the extension of the culture time.On the other hand,MDA content was increased and activities of SOD,CAT was decreased with the rising of the concentration of aluminum.However,the change of POD activity was not obvious.In general,the aluminum toxicity of C.lanceolata seedling leaves were more serious in high aluminum cases than in high calcium cases.Therefore,calcium ion can alleviate aluminum toxicity of C.lanceolata seedling leaves.