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<p>Soil contamination by heavy metals, poses a significant environmental challenge, particularly in mining-affected regions such as the Zeïda area in Morocco. Plant-Rhizobacteria associations have emerged as a promising approach to mitigate heavy metal toxicity and enhance phytoremediation efficiency. Thus, the present study aims to evaluate the impact of Zn toxicity on <i>Medicago sativa</i> (alfalfa) and to assess the potential of two previously identified rhizobacterial strains, <i>Bacillus subtilis</i> AaR114 and <i>Neobacillus niacini</i> AaR72, which exhibit multiple plant growth-promoting traits, in alleviating Zn toxicity in alfalfa. Specifically, we investigate their role in improving plant growth, facilitating Zn accumulation, and regulating Zn translocation within the plant’s parts. The results demonstrate a concentration-dependent effect of Zn, significantly reducing seed germination and radicle length. Additionally, chlorophyll content declined by 16.55% under metal stress, but bacterial inoculation enhanced chlorophyll levels, particularly under stress conditions. Moreover, Zn exposure led to reductions in root length (7%) and shoots and roots dry weight by 34,97% and 26,3%, respectively. However, the inoculation with AaR114 and AaR72 improved alfalfa growth, with co-inoculation leading to the most significant increase in shoot length (41.7%). Regarding Zn accumulation, the highest concentration was observed in roots (1205.48&#xa0;mg/kg), additionally, inoculation with AaR114 improved root Zn uptake by 24%, whereas a significant reduction of 54.52% in Zn levels in shoots was observed in plants inoculated with AaR72. Bacterial inoculation also increased Zn mobility. These findings highlight the potential of microbial inoculation in alleviating Zn stress and enhancing alfalfa growth.</p>

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Impact of Bacillus subtilis and Neobacillus niacini on growth and zinc uptake in alfalfa under stress

  • 期刊论文

  • 发表日期：

    2025年6月21日

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  • M. B. Bouarrakia,
  • A. Elyemlahi,
  • O. Elgaliou,
  • M. H. Zerrouk,
  • A. Laglaoui,
  • M. Bakkali,
  • Abdelhay Arakrak

摘要

Soil contamination by heavy metals, poses a significant environmental challenge, particularly in mining-affected regions such as the Zeïda area in Morocco. Plant-Rhizobacteria associations have emerged as a promising approach to mitigate heavy metal toxicity and enhance phytoremediation efficiency. Thus, the present study aims to evaluate the impact of Zn toxicity on Medicago sativa (alfalfa) and to assess the potential of two previously identified rhizobacterial strains, Bacillus subtilis AaR114 and Neobacillus niacini AaR72, which exhibit multiple plant growth-promoting traits, in alleviating Zn toxicity in alfalfa. Specifically, we investigate their role in improving plant growth, facilitating Zn accumulation, and regulating Zn translocation within the plant’s parts. The results demonstrate a concentration-dependent effect of Zn, significantly reducing seed germination and radicle length. Additionally, chlorophyll content declined by 16.55% under metal stress, but bacterial inoculation enhanced chlorophyll levels, particularly under stress conditions. Moreover, Zn exposure led to reductions in root length (7%) and shoots and roots dry weight by 34,97% and 26,3%, respectively. However, the inoculation with AaR114 and AaR72 improved alfalfa growth, with co-inoculation leading to the most significant increase in shoot length (41.7%). Regarding Zn accumulation, the highest concentration was observed in roots (1205.48 mg/kg), additionally, inoculation with AaR114 improved root Zn uptake by 24%, whereas a significant reduction of 54.52% in Zn levels in shoots was observed in plants inoculated with AaR72. Bacterial inoculation also increased Zn mobility. These findings highlight the potential of microbial inoculation in alleviating Zn stress and enhancing alfalfa growth.