草莓叶面施硒对其重金属镉和铅积累的影响

 以‘北农3号’草莓为试材，以清水喷施为对照，用0.5、1.0、2.5、5.0、10.0 mg · L^-1浓度的亚硒酸钠进行叶面喷施，定期采样进行硒、镉和铅和相关生理指标的动态监测，研究叶面施硒后重金属镉和铅在草莓机体内的积累情况和草莓生理代谢机制的变化，探明硒对镉和铅的互作效应。结果表明，草莓在展叶期和盛花期对硒的吸收能力最强，且施用2.5 ~ 5.0 mg · L^-1适宜浓度硒后，硒可通过清除膜脂过氧化产物丙二醛（MDA），保护细胞膜的完整性，降低重金属离子的含量，有效抑制草莓叶片和果实对重金属镉和铅的吸收，证明叶面施硒不仅是草莓补硒的较好手段，而且适宜浓度的硒可减少草莓对重金属镉和铅的吸收。

Effects of Cadmium and Lead Accumulation in Strawberry Growing Period by Spraying Se-fertilizer to Leaves

‘Beinong 3’strawberry was sprayed Se-fertilizer on leaves in different growing stages at the Na₂SeO₃ concentrations of 0，0.5，1.0，2.5，5.0 and 10.0 mg .8226. L^-1. The Se，Cd and Pb content and other physiological indexes of leaves were detected after Se-fertilizer was sprayed. Heavy metal cadmium（Cd）and lead（Pb）accumulation affected by spraying Se-fertilizer to strawberry leaves. The changes of metabolic mechanism of strawberries after exogenous selenium being sprayed，and the interactive effects of selenium and heavy metal was investigated. The research results show that the strawberry had the highest absorption capacity of Se in the leaf-expansion period and full opening flower period，and Se can slow down the damage of cell membrane integrity by removing malonaldehyde（MDA）accumulation of membrance lipid peroxidation. Further，the toxic action of heavy metals was reduced，and the deposition of Cd and Pb in the strawberry leaves and fruits was effectively controlled. This research shows spraying Se-fertilizer to leaves is a sound method for supplementing selenium to the strawberries and suitable amount of selenium can alleviate the toxic action to the strawberry caused by heavy metal.