Zinc–Cadmium Interaction Affects Growth, Metal Accumulation, Photosynthesis, and Antioxidant Activity in Two Mung Bean Varieties

Authors

  • Md Harunur Rashid Global Centre for Environmental Remediation, The University of Newcastle, Callaghan, NSW 2308, Australia
    • Mohammad Mahmudur Rahman Global Centre for Environmental Remediation, The University of Newcastle, Callaghan, NSW 2308, Australia https://orcid.org/0000-0002-3426-5221
      • Md Imran Ullah Sarkar Global Centre for Environmental Remediation, The University of Newcastle, Callaghan, NSW 2308, Australia
        • Ravi Naidu Global Centre for Environmental Remediation, The University of Newcastle, Callaghan, NSW 2308, Australia https://orcid.org/0000-0002-1520-2495

          DOI:

          https://doi.org/10.63697/jeshs.2025.10026

          Keywords:

          Zinc, Cadmium, Accumulation, Photosynthetic pigments, Mung beans, Reactive oxygen species (ROS), Antioxidant enzymes

          Abstract

          Zinc (Zn) is an essential element, and zinc sulfate (ZnSO4) has been extensively applied to crops to combat its deficiency. Moreover, adding Zn brings benefits by reducing cadmium (Cd) accumulation by crops, although its impact on Cd uptake is inconsistent in the literature. Two promising mung bean (Vigna radiata) varieties, released as Jade-AU and Celera II-AU by the Australian Mung Bean Association, were grown hydroponically to examine the effects of ZnSO4 application on Cd accumulation in tissues. This was done by measuring photosynthetic pigments, plant biomass production, Zn and Cd accumulation, and antioxidative enzyme systems. Seven-day-old seedlings were exposed to different levels of Zn (0, 1, 2, 4, and 8 µM) and Cd (0, 0.5, and 1 µM) for 14 days. While the addition of Zn significantly (p < 0.01) enhanced photosynthetic pigments, plant biomass, and Zn and Cd concentrations in tissues, the prevalence of Cd revealed damaging outcomes. Zn accumulation in shoots increased as much as 6-fold (95 mg kg⁻¹ in Jade-AU) with the application of Zn alone, while adding Cd restricted the trend. In contrast, Zn accumulation in roots rose 28-fold (146 mg kg⁻¹ in Celera II-AU) when both Zn and Cd were present. Cd concentration in the shoot rose by as much as 22-fold (1.8 mg kg⁻¹ in Celera II-AU) with the application of Cd alone and virtually tripled (5.42 mg kg⁻¹ and 6.99 mg kg⁻¹, in Jade-AU and Celera II-AU, respectively), when Zn and Cd interacted synergistically.  Zn addition restricted Cd accumulation in roots under low-Cd level (0.5 mM), while it was unable to limit the translocation of Cd to shoots. Zn application significantly improved antioxidant enzyme activities, with increases observed up to 13% for APX, 41% for CAT, 40% for POD, and 35% for SOD relative to the control. This refers to both varieties of mung beans, indicating the benefit of Zn application in nullifying oxidative stress and maintaining plant growth. Of the two varieties, Jade-AU displayed less Cd translocation from the roots to shoots and produced higher biomass, demonstrating its Cd-tolerant advantages.

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          Author Biographies

          • Mohammad Mahmudur Rahman, Global Centre for Environmental Remediation, The University of Newcastle, Callaghan, NSW 2308, Australia

            Dr. Mohammad Mahmudur Rahman is an Associate Professor at the Global Centre for Environmental Remediation (GCER), University of Newcastle, Australia. With more than 20 years of academic and research experience, he is recognised for his expertise in assessing human exposure to toxic metals and metalloids via food and drinking water. He earned his doctorate in Environmental Science and has since developed a research portfolio that bridges environmental chemistry, soil and water sciences, hydrogeology, food safety, and remediation technologies.

            His work has been central to understanding and mitigating arsenic and cadmium accumulation in rice, alongside advancing innovative, low-cost strategies for reducing contamination in water and crops. By integrating cross-disciplinary approaches, Dr. Rahman has contributed to the design of sustainable agricultural practices and remediation methods that address pressing environmental and public health challenges.

            A committed mentor, he has supervised and collaborated with PhD students from diverse backgrounds, promoting inclusivity in scientific research and training. Widely published in leading international journals, his research has influenced global frameworks for food and water safety, environmental sustainability, and human health risk reduction.

          • Ravi Naidu, Global Centre for Environmental Remediation, The University of Newcastle, Callaghan, NSW 2308, Australia

            Distinguished Laureate Professor Ravi Naidu has devoted more than 30 years to advancing research on environmental contaminants, establishing himself as a global leader in environmental sustainability, soil science, and remediation technologies. He earned both his PhD and Doctor of Science in Environmental Science from Massey University, New Zealand. Early in his career, he served as Senior Lecturer in Chemistry and Dean of the School of Pure and Applied Sciences at the University of the South Pacific (1985–1989). He later joined CSIRO Land and Water in Adelaide, where he rapidly rose to leadership positions, including Chief Research Scientist, Group Leader, and Head of the Remediation of Contaminated Environments Program. He also coordinated the national program on restoring contaminated environments and directed the Sodic Soils and Soil Contamination & Remediation initiatives within the CRC for Soil and Land Management.

            Professor Naidu has been at the forefront of applying cutting-edge technologies, including nanotechnology, to improve environmental remediation and promote safer pesticide use. His prolific contributions include more than 950 peer-reviewed publications and 17 co-edited books that have shaped soil and environmental sciences. He holds fellowships with several prestigious organisations, including the American Association for the Advancement of Science, the American Society of Agronomy, the Soil Science Society of America, and the New Zealand Society of Soil Science. He is also a Fellow of the Academy of Science of several countries.  His research has translated into tangible solutions, with two of his co-invented patents now fully commercialised and remediation facilities operational in multiple Australian states to treat contaminated wastewater.

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          Graphical abstract

          Published

          2025-08-30

          Data Availability Statement

          The data that supports this research will be shared upon reasonable request to the corresponding authors.

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          How to Cite

          (1)
          Rashid, M. H.; Rahman, M. M.; Sarkar, M. I. U.; Naidu, R. Zinc–Cadmium Interaction Affects Growth, Metal Accumulation, Photosynthesis, and Antioxidant Activity in Two Mung Bean Varieties. J. Environ. Sci. Health Sustain. 2025, 1 (2), 102–118. https://doi.org/10.63697/jeshs.2025.10026.