Welcome to Chinese Agricultural Science Bulletin,
CASB

Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (27): 1-10.doi: 10.11924/j.issn.1000-6850.casb2025-0059

    Next Articles

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 Online:2025-09-25 Published:2025-10-07

RichHTML

3

PDF (PC)

23

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