中国农学通报2025，Vol.41Issue(27)：1-10,10.
小麦地上部吸收的镉向根系转运及对营养元素吸收的影响研究
Transfer of Shoot Absorbed Cd to Root and Its Effect on Nutrient Elements Absorption in Hydroponic Wheat
摘要
Abstract
The objective of this study was to investigate whether Cd absorbed by wheat shoot can be transported to the roots,and its effects on the uptake of Cu,Mn,and Zn by the plant,and whether leaf-tip cutting could promote Cd absorption by the leaves.Wheat seedling shoots were immersed in Cd solutions(0,50,and 100 mg/L)for 24 hours,and an additional treatment with one-third of the leaf tips cut for the 50 mg/L treatment was set up.Wheat samples were collected at 1,3,7,and 14 days after Cd exposure to analyze shoot and root length,biomass,as well as the concentration and accumulation of Cd,Cu,Mn,and Zn in the shoots and roots.The results showed that,under Cd treatments,Cd concentrations in shoots and roots ranged from 216-614 mg/kg and 3.24-13.2 mg/kg,respectively.On all four sampling dates,Cd concentrations in roots under Cd treatments were significantly higher than the control(P<0.05).The proportion of Cd accumulated in roots relative to total plant accumulation ranged from 0.164%to 0.487%,and no significant differences were observed across the four sampling times for root Cd accumulation.No significant differences(P>0.05)in Cd concentration or accumulation of shoot and root were found between the two 50 mg/L treatments(intact vs.cut leaves).Only on 14th day,the Cd concentration of the 100 mg/L treatment was significantly greater than the 50 mg/L treatment(P<0.05).At certain sampling times,Zn concentration in shoots and roots,as well as Cu concentration in roots of the Cd treatments were significantly lower than the control(P<0.05).These results indicated that Cd applied to wheat shoot was transported to the roots as early as on 1st day after the exposure.However,after the Cd exposure ended,Cd accumulated in the shoots was no longer transported to the roots.Leaf-tip cutting did not enhance Cd absorption in the shoots.Moreover,Cd transported from shoots to roots inhibited Zn and Cu uptake by the roots.关键词
小麦/镉/地上部/吸收/根系/剪口Key words
wheat plant/cadmium/shoot/absorption/root/cut分类
农业科技引用本文复制引用
赵林林,刘朋坤,邢维芹,王丽萍,杨永强,黄新君,邱坤艳,李立平..小麦地上部吸收的镉向根系转运及对营养元素吸收的影响研究[J].中国农学通报,2025,41(27):1-10,10.基金项目
河南省教育厅河南省高等学校重点科研项目"小麦地上部吸收镉的机理研究"(23A610005) （23A610005）
国家自然科学基金项目"机械碾压剪切过程对土壤孔隙及水、气传输影响机理研究"(42207366). （42207366）
