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中国农学通报 ›› 2025, Vol. 41 ›› Issue (27): 1-10.doi: 10.11924/j.issn.1000-6850.casb2025-0059

• 农学·农业基础科学 •    下一篇

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

赵林林1(), 刘朋坤2,3,4, 邢维芹2,3,4, 王丽萍2,3,4, 杨永强2,3,4, 黄新君2,3,4, 邱坤艳1(), 李立平2,3,4()   

  1. 1 河南省济源生态环境监测中心,河南济源 459000
    2 河南工业大学环境工程学院,郑州 450001
    3 河南省环境污染修复与粮食质量安全国际联合实验室,郑州 450001
    4 河南工业大学碳中和研究院,郑州 450001
  • 收稿日期:2025-01-24 修回日期:2025-04-25 出版日期:2025-09-25 发布日期:2025-10-07
  • 通讯作者:
    邱坤艳,女,1982年出生,河南济源人,正高级工程师,博士,研究方向:环境科学。通信地址:459000 河南省济源市汤帝路868号,Tel:0391-6963368,E-mail:
    李立平,男,1972年出生,甘肃灵台人,教授,博士,研究方向:环境土壤学,主持完成国家级项目2项,发表学术论文100余篇。通信地址:450001 河南省郑州市高新区莲花街100号,Tel:0371-67756982,E-mail:
  • 作者简介:

    赵林林,男,1989年出生,河南济源人,工程师,本科,学士,研究方向:环境监测。通信地址:459000 河南省济源市汤帝路868号,Tel:0391-6963368,E-mail:

  • 基金资助:
    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); 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)

Transfer of Shoot Absorbed Cd to Root and Its Effect on Nutrient Elements Absorption in Hydroponic Wheat

ZHAO Linlin1(), LIU Pengkun2,3,4, XING Weiqin2,3,4, WANG Liping2,3,4, YANG Yongqiang2,3,4, HUANG Xinjun2,3,4, QIU Kunyan1(), LI Liping2,3,4()   

  1. 1 Jiyuan Ecological and Environmental Monitoring Center of Henan Province, Jiyuan, Henan 459000
    2 School of Environmental Engineering, Henan University of Technology, Zhengzhou 450001
    3 Henan International Joint Laboratory of Environmental Pollution, Remediation and Grain Quality Security, Zhengzhou 450001
    4 Institute of Carbon Neutrality, Henan University of Technology, Zhengzhou 450001
  • Received:2025-01-24 Revised:2025-04-25 Published:2025-09-25 Online:2025-10-07

摘要:

本研究旨在探究小麦地上部所吸收的镉是否能够运输至根系,以及这种运输对植株吸收铜、锰和锌所产生的影响,同时考察叶片剪口是否能够促进叶片对镉的吸收。将小麦幼苗地上部浸没于不同浓度(0、50、100 mg/L)的镉溶液中24 h,针对50 mg/L浓度的处理,同时设置剪去叶尖1/3的实验组。在镉处理后的第1、3、7、14天分别进行采样,对小麦地上部和根系的长度、生物量以及镉、铜、锰和锌的含量与积累量展开分析。研究结果显示,施镉处理后,小麦地上部镉含量范围为216~614 mg/kg,根系镉含量范围为3.24~13.2 mg/kg。在4个采样时期,施镉处理的根系镉含量均显著高于对照组(P<0.05)。根系镉积累量占植株总积累量的比例介于0.164%~0.487%之间。施镉处理的根系镉积累量在4个采样时间点之间未呈现显著差异。在镉浓度为50 mg/L的两个处理组(完整叶片组和剪口叶片组)之间,镉含量或积累量均无显著差异(P>0.05)。仅在第14天采样时,100 mg/L处理组的地上部镉含量显著高于50 mg/L处理组(P<0.05)。在部分采样时间,施镉处理的地上部和根系锌含量以及根系铜含量显著低于对照组(P<0.05)。综上所述,地上部施用的镉在处理后的第1天即可转运至根部,但施镉结束后,地上部积累的镉无法继续向根部转运;叶片剪口并不能促进小麦地上部对镉的吸收;地上部吸收的镉转运至根系后,会抑制根系对锌和铜的吸收。

关键词: 小麦, 镉, 地上部, 吸收, 根系, 剪口

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.

Key words: wheat plant, cadmium, shoot, absorption, root, cut