硅对Cd、Pb、Cu、Zn正交胁迫下水稻丙二醛含量的影响

采用土壤重金属正交L9(34)胁迫方法 ,通过盆栽试验,研究喷施有机硅和无机硅溶液对水稻叶片丙二醛(MDA)含量和变化趋势的影响。结果表明,土壤受重金属污染,水稻叶片MDA含量显著升高,随着重金属胁迫浓度升高,MDA含量逐渐增加;随着生长时期的延长,MDA含量呈现先升高后下降的趋势。不同种类重金属对水稻叶片MDA含量影响由大到小依次是Cd、Pb、Cu、Zn。经有机硅处理的水稻叶片MDA含量(504.63μmol/g FW)最低,无机硅处理(565.85μmol/g FW)次之,无硅处理(611.73μmol/g FW)最高,不同处理间叶片MDA含量差异水平极显著(P0.01)。可见,硅处理有利于维持水稻膜脂过氧化系统平衡,诱导其抵御重金属胁迫的毒害机制。

Effects of Silicon on Malondialdehyde Content in Rice under the Orthogonal Stress of Cd,Pb,Cu and Zn

Pot experiments with an orthogonal stress experimental design L9(34) were conducted to study the effects of organic/non-organic silicon solution spraying on the malondialdehyde (MDA) content and its change trend in rice leaves under the heavy metals pollution.Results showed that MDA content in rice leaves increased significantly when soil polluted by heavy metals;MDA content gradually increased with the increase of heavy metals concentration;MDA content showed the trend of first increasing then decreasing with the prolonging of growth period.Effect order on rice leaves of different heavy metals was Cd＞Pb＞Cu＞Zn.The rice leaves treated with organic silicon had the lowest MDA content(565.85 μmol/g FW),and followed by those treated with non-organic silicon (565.85 μmol/g FW).The highest content was found in those without silicon treatment (611.73 μmol/g FW).And the differential of MDA contents in leaves with different treatment was significant (P＜0.01).This proved that,silicon treatment makes for maintaining the balance of lipid peroxidation system of rice,and induces it to resist the damage of heavy metals tress.