不同硒形态对玉米根系形态和养分吸收的影响  

Effects of Different Selenium Forms on Maize Root Morphology and Nutrients Absorption

作　　者：位晶 牛乐 唐宏亮[1] WEI Jing;NIU Le;TANG Hong-liang(College of Life Sciences,Hebei University,Baoding,Heibei 071002)

机构地区：[1]河北大学生命科学学院,河北保定071002

出　　处：《安徽农业科学》2019年第4期153-157,共5页Journal of Anhui Agricultural Sciences

基　　金：河北省自然科学基金项目(C2018201206)

摘　　要：[目的]明确玉米幼苗在不同浓度Se(Ⅵ)和Se(Ⅳ)处理下根系形态和养分吸收的效应,为缺硒土壤合理补硒提供科学依据。[方法]以玉米品种郑单958为材料,采用营养液培养方法研究了不同浓度Se(Ⅵ)和Se(Ⅳ)对玉米生长和养分吸收的影响。[结果]相同硒浓度下,Se(Ⅵ)处理的玉米地上部干重显著高于Se(Ⅳ)处理;低浓度硒处理[Se(Ⅵ)≤12.50μmol/L,Se(Ⅳ)≤25.00μmol/L]玉米幼苗中硒含量均随硒浓度的增加而增加。相同硒浓度下,硒浓度<12.50μmol/L时,玉米地上部Se(Ⅵ)的累积量低于Se(Ⅳ)累积量,硒浓度≥12.50μmol/L时,玉米地上部Se(Ⅵ)的累积量显著高于Se(Ⅳ)累积量。相同硒浓度下,Se(Ⅵ)处理的玉米幼苗氮、磷、钾累积量显著高于Se(Ⅳ)处理。[结论]低浓度硒[Se(Ⅳ)≤6.25μmol/L,Se(Ⅵ)≤12.50μmol/L]可促进玉米生长和养分吸收,表现为根长伸长、根增粗以及氮、磷和钾累积量的增加,高浓度硒导致玉米生长受到抑制,氮、磷和钾累积量减小。[Objective]The effects of root morphology and nutrient uptake of Se(Ⅵ) and Se(Ⅳ) in different concentrations of maize seedlings were determined,which provided a scientific basis for crop remediation of selenium-enriched soils with reasonable selenium.[Method]The effects of different concentrations of Se(Ⅵ) and Se(Ⅳ) on corn growth and nutrient uptake were studied by using nutrient solution culture method.[Result]Under the same selenium concentration,the dry weight of Se(Ⅵ) treated maize was significantly higher than Se(Ⅳ) treatment;Low concentration selenium treatment [Se(Ⅵ)≤12.50 μmol/L,Se(Ⅳ)≤25.00 μmol/L],selenium content increased with the increase of selenium concentration.At the same selenium concentration,when the concentration of selenium was<12.50 μmol/L,the accumulation of Se(Ⅵ) in the aboveground part of maize was lower than that of Se(Ⅳ).When the concentration of selenium was ≥12.50 μmol/L,the accumulation of Se (Ⅵ) in the aboveground part of corn was significantly higher than the amount of accumulation in Se(Ⅳ).Under the same selenium concentration,the accumulation of nitrogen,phosphorus and potassium in Se(VI)-treated maize seedlings was significantly higher than that in Se(Ⅳ) treatment.[Conclusion]Low concentration of selenium [Se(Ⅳ)≤6.25 μmol/L,Se(Ⅵ)≤12.50 μmol/L] can promote the growth of maize and nutrient uptake,which is characterized by root length elongation,root thickening,nitrogen,phosphorus and potassium accumulation,high concentration of selenium.The growth of maize was inhibited,and the accumulation of nitrogen,phosphorus and potassium decreased.

关 键 词：玉米 硒酸钠 亚硒酸钠 根系形态 养分吸收 

分 类 号：S143.79[农业科学—肥料学]