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<p>The present research was undertaken to evaluate the phytoremediation and tolerance potential of new beneficial endophytic fungi in canola (<i>Brassica napus</i> L.) plants grown in Pb-contaminated soils. The treatments, arranged in a factorial completely randomized design with three replicates, included a novel fungal isolate (<i>Libertella</i> sp. F6), a commercial fungal isolate (<i>Trichoderma longibrachiatum</i>), and non-inoculated control (NC). The effects of fungal inoculation and exogenous application of the polyamine spermidine (Spd) were assessed across a range of Pb concentrations. Inoculated plants showed a decreasing trend in Pb accumulation and translocation indices with increasing Pb levels, with root bioconcentration factor (BCF) values exceeding one in most treatments (ranging from 1.0 to 13.4), indicating enhanced phytoremediation potential, particularly in the <i>Libertella</i>-inoculated plants. Hydrogen peroxide content was reduced by up to 75% in inoculated plants. Antioxidant enzyme activities were generally lower in inoculated plants than in the non-inoculated control across different Spd levels. Proline content (PC) increased (by 76%) in inoculated plants, with a more pronounced increase in <i>Libertella</i>-inoculated treatments. The Spd also positively influenced both enzyme activities and PC. In conclusion, <i>Libertella</i> sp. shows promise as a beneficial endophytic root fungus for improving Pb phytoremediation and tolerance in canola, especially when supplemented with an optimal dose of Spd.</p>

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Improvement of lead tolerance and phytoremediation potential of canola inoculated with Libertella sp., as a new beneficial endophytic fungus

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Mehranoosh Emamian Tabarestani,
  • Hemmatollah Pirdashti,
  • Mohammad Ali Tajik Ghanbary,
  • Fardin Sadeghzadeh,
  • Mohammad Yaghoubi Khanghahi

摘要

The present research was undertaken to evaluate the phytoremediation and tolerance potential of new beneficial endophytic fungi in canola (Brassica napus L.) plants grown in Pb-contaminated soils. The treatments, arranged in a factorial completely randomized design with three replicates, included a novel fungal isolate (Libertella sp. F6), a commercial fungal isolate (Trichoderma longibrachiatum), and non-inoculated control (NC). The effects of fungal inoculation and exogenous application of the polyamine spermidine (Spd) were assessed across a range of Pb concentrations. Inoculated plants showed a decreasing trend in Pb accumulation and translocation indices with increasing Pb levels, with root bioconcentration factor (BCF) values exceeding one in most treatments (ranging from 1.0 to 13.4), indicating enhanced phytoremediation potential, particularly in the Libertella-inoculated plants. Hydrogen peroxide content was reduced by up to 75% in inoculated plants. Antioxidant enzyme activities were generally lower in inoculated plants than in the non-inoculated control across different Spd levels. Proline content (PC) increased (by 76%) in inoculated plants, with a more pronounced increase in Libertella-inoculated treatments. The Spd also positively influenced both enzyme activities and PC. In conclusion, Libertella sp. shows promise as a beneficial endophytic root fungus for improving Pb phytoremediation and tolerance in canola, especially when supplemented with an optimal dose of Spd.