土壤添加玉米秸秆对小麦Pb毒害缓解效应

采用室内盆栽和网室盆栽的方法研究了Pb污染土壤上玉米秸秆对小麦幼苗生物效应、成熟期籽粒Pb含量和蛋白质含量以及产量性状的影响,探讨了玉米秸秆缓解Pb毒害小麦的生理机制.结果表明,添加3g/kg和6g/kg的玉米秸秆对Pb污染土壤上小麦幼苗生长有明显的促进作用,能有效缓解Pb对小麦的毒害.具体表现为,与对照相比,小麦幼苗根长、芽长、植株干重增大,叶绿素含量和根系活力升高,过氧化物酶(POD)和超氧化物歧化酶(SOD)同工酶活性以及丙二醛(MDA)含量下降,小麦成熟期籽粒Pb含量降低,蛋白质含量以及生物产量升高.

Effects of alleviating the toxicity of Pb to wheat by adding corn stalk in polluted soil

Effects of corn stalk on wheat seedling, contents of Pb and protein in mature grains as well as yield properties were studied in polluted soil of Pb by in-door and out-door pot experiments. At the same time, the physiological mechanism of alleviating toxicity of Pb to wheat by corn stalk was investigated in detail. The results showed that the growth of wheat seedling was significantly promoted by adding 3g/kg and 6g/kg corn stalk into the Pb polluted soil and the toxicity of Pb to wheat was also effectively alleviated. Detailedly, compared to the control, the root length, shoot length, dry weight of plant, chlorophyl content and root activity increased by contraries of the activities decreasing of peroxidase(POD) and superoxide dismutase(SOD) isoenzymes as well as malondialdehyde(MDA) content. What is more, the corn stalk could reduce the content of Pb in grains and enhance the grains protein content and biological yield.