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Purpose <p>Heavy metal pollution has detrimental impacts on ecosystems and human health. This research endeavor aimed to examine the combined efficacy of wheat straw biochar and plant growth-promoting rhizobacteria (PGPR) in alleviating soil contamination caused by Pb and Cd.</p> Methods <p>Through a pot trial, four treatments (Control, PGPR, biochar and their combination) were evaluated for their effects on <i>Brassica campestris</i> growth, antioxidant status, physiology, and heavy metal uptake in contaminated soil collected from a polluted area.</p> Results <p>The findings indicated that the concurrent application of PGPR and biochar substantially enhanced the growth of plants and reduced the levels of heavy metals in their constituent components. Notably, the combined application of PGPR and biochar yielded remarkable results. This led to a substantial 50% increase in shoot height, a 73% increase in root length, and a 48.6% enhancement in chlorophyll content compared to respective uninoculated and untreated control at high contaminated soil (soil-III). Furthermore, dry biomass significantly increased by 55.8% compared to the respective control in the same contamination level (soil-III). The decrease in ascorbate peroxidase (52%), catalase (47%), superoxide dismutase (27%), and membrane lipid peroxidation (39%) were observed due to co-application of PGPR and biochar in high contaminated soil when compared with uninoculated untreated control. Most importantly, the concentrations of Pb and Cd in the plants were substantially reduced by 58.3% and 86.3% compared to respective untreated plants, respectively, when both PGPR and biochar were applied in combination at high contaminated soil (soil-III).</p> Conclusion <p>The combined use of biochar and PGPR demonstrates a promising approach to improve plant growth, reduce heavy metal accumulation, and mitigate oxidative stress in <i>Brassica campestris</i> under heavy metal-contaminated conditions.</p>

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Biochar and Pseudomonas aeruginosa M2 Co-Application: A Sustainable Strategy for Enhancing Growth and Heavy Metal Tolerance in Brassica campestris

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Muhammad Muzammil Mukhtar,
  • Qasim Ali,
  • Muhaimen Ayyub,
  • Muhammad Aon,
  • Hayssam M. Ali,
  • Sadaf Oranab,
  • Iftikhar Ahmad,
  • Ghulam Abbas,
  • Behzad Murtaza,
  • Waqas Mohy-Ud-Din,
  • Usman Zulfiqar,
  • Muhammad Faisal Maqsood,
  • Muhammad Mahroz Hussain,
  • Zain Mushtaq,
  • Muhammad Javed Akhtar

摘要

Purpose

Heavy metal pollution has detrimental impacts on ecosystems and human health. This research endeavor aimed to examine the combined efficacy of wheat straw biochar and plant growth-promoting rhizobacteria (PGPR) in alleviating soil contamination caused by Pb and Cd.

Methods

Through a pot trial, four treatments (Control, PGPR, biochar and their combination) were evaluated for their effects on Brassica campestris growth, antioxidant status, physiology, and heavy metal uptake in contaminated soil collected from a polluted area.

Results

The findings indicated that the concurrent application of PGPR and biochar substantially enhanced the growth of plants and reduced the levels of heavy metals in their constituent components. Notably, the combined application of PGPR and biochar yielded remarkable results. This led to a substantial 50% increase in shoot height, a 73% increase in root length, and a 48.6% enhancement in chlorophyll content compared to respective uninoculated and untreated control at high contaminated soil (soil-III). Furthermore, dry biomass significantly increased by 55.8% compared to the respective control in the same contamination level (soil-III). The decrease in ascorbate peroxidase (52%), catalase (47%), superoxide dismutase (27%), and membrane lipid peroxidation (39%) were observed due to co-application of PGPR and biochar in high contaminated soil when compared with uninoculated untreated control. Most importantly, the concentrations of Pb and Cd in the plants were substantially reduced by 58.3% and 86.3% compared to respective untreated plants, respectively, when both PGPR and biochar were applied in combination at high contaminated soil (soil-III).

Conclusion

The combined use of biochar and PGPR demonstrates a promising approach to improve plant growth, reduce heavy metal accumulation, and mitigate oxidative stress in Brassica campestris under heavy metal-contaminated conditions.