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<p>Iron (Fe) deficiency remains a global nutritional challenge affecting both plants and humans. In calcareous soils, high pH limits Fe bioavailability, leading to impaired plant growth and reduced dietary Fe intake. The present study assessed the impact of pre-isolated iron-solubilizing rhizobacteria and auxin (L-tryptophan) on Fe content and agronomic performance of potato. A pot experiment was conducted under controlled conditions at the Department of Agriculture, University of the Punjab, Lahore. Treatments included individual and combined applications of two bacterial strains, FeSO₄, and L-tryptophan. Parameters such as chlorophyll content, carotenoids, leaf area, biomass, and mineral concentrations (Fe, N, P) were evaluated. Results revealed that microbial inoculation significantly enhanced plant growth, pigment synthesis, and nutrient uptake compared with the control. The combined application of both strains with L-tryptophan exhibited the highest improvement in Fe content (126&#xa0;mg&#xa0;kg⁻<sup>1</sup>), chlorophyll a (28.42&#xa0;mg&#xa0;g⁻<sup>1</sup> FW), and plant biomass (43.6&#xa0;g plant⁻<sup>1</sup>). These findings indicate a synergistic interaction between rhizobacteria and auxin, suggesting a promising biofortification strategy to enhance Fe accumulation and Potato productivity in calcareous soils.</p>

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Impact Assessment of Pre-Isolated Iron-Solubilizing Rhizobacteria and Auxin on Iron Content and Growth of Potato

  • 期刊论文

  • 发表日期：

    2026年4月12日

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  • Faheem Waris,
  • Ayesha Iqbal,
  • Khairiah Mubarak Alwutayd,
  • Ahad Mohammed Althyab,
  • Hanan M. Alharbi

摘要

Iron (Fe) deficiency remains a global nutritional challenge affecting both plants and humans. In calcareous soils, high pH limits Fe bioavailability, leading to impaired plant growth and reduced dietary Fe intake. The present study assessed the impact of pre-isolated iron-solubilizing rhizobacteria and auxin (L-tryptophan) on Fe content and agronomic performance of potato. A pot experiment was conducted under controlled conditions at the Department of Agriculture, University of the Punjab, Lahore. Treatments included individual and combined applications of two bacterial strains, FeSO₄, and L-tryptophan. Parameters such as chlorophyll content, carotenoids, leaf area, biomass, and mineral concentrations (Fe, N, P) were evaluated. Results revealed that microbial inoculation significantly enhanced plant growth, pigment synthesis, and nutrient uptake compared with the control. The combined application of both strains with L-tryptophan exhibited the highest improvement in Fe content (126 mg kg⁻1), chlorophyll a (28.42 mg g⁻1 FW), and plant biomass (43.6 g plant⁻1). These findings indicate a synergistic interaction between rhizobacteria and auxin, suggesting a promising biofortification strategy to enhance Fe accumulation and Potato productivity in calcareous soils.