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Background and aims <p>The fungal root endophyte <i>Piriformospora indica</i> has been implicated in enhancing plant tolerance to salt stress. This study aimed to understand the role of root cell hydraulic conductivity in enhancing salt tolerance of maize plants by this fungal endophyte.</p> Methods <p>Maize seedlings inoculated with <i>P. indica</i> were compared with non-inoculated control plants following exposure to 0, 60, and 120&#xa0;mM NaCl for 24&#xa0;days and their growth and physiological parameters including root cell hydraulic conductivity examined.</p> Results <p><i>P. indica</i> inoculation significantly increased root and shoot dry weight, and stem height. Compared to 60&#xa0;mM NaCl, the 120&#xa0;mM NaCl treatment further decreased shoot dry weight, stem height, net photosynthetic rate, and transpiration rate, but not the root dry weight and stem diameter. The 120&#xa0;mM NaCl treatment reduced the root cell hydraulic conductivity in the non-inoculated plants compared to the inoculated plants. Following the 120&#xa0;mM NaCl treatment, <i>P. indica-</i>inoculated seedlings had lower root and shoot Na concentration, but no reduction in N and P concentrations compared with the non-inoculated seedlings. While 60&#xa0;mM and 120&#xa0;mM NaCl treatments reduced final seed weight and seed number, <i>P. indica</i> inoculation partly alleviated these reductions.</p> Conclusions <p>The results demonstrated that the enhancement of salt tolerance in maize plants by <i>P. indica</i> involves reductions in root and shoot Na uptake and maintenance of the transmembrane root water transport which helped alleviate the effects of NaCl on gas exchange, nutrient uptake, and growth.</p>

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Beneficial root endophyte Piriformospora indica reduces plant sodium uptake and enhances cell hydraulic conductivity and salt tolerance of maize seedlings

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Seong Hee Lee,
  • Yi Wang,
  • Janusz J. Zwiazek

摘要

Background and aims

The fungal root endophyte Piriformospora indica has been implicated in enhancing plant tolerance to salt stress. This study aimed to understand the role of root cell hydraulic conductivity in enhancing salt tolerance of maize plants by this fungal endophyte.

Methods

Maize seedlings inoculated with P. indica were compared with non-inoculated control plants following exposure to 0, 60, and 120 mM NaCl for 24 days and their growth and physiological parameters including root cell hydraulic conductivity examined.

Results

P. indica inoculation significantly increased root and shoot dry weight, and stem height. Compared to 60 mM NaCl, the 120 mM NaCl treatment further decreased shoot dry weight, stem height, net photosynthetic rate, and transpiration rate, but not the root dry weight and stem diameter. The 120 mM NaCl treatment reduced the root cell hydraulic conductivity in the non-inoculated plants compared to the inoculated plants. Following the 120 mM NaCl treatment, P. indica-inoculated seedlings had lower root and shoot Na concentration, but no reduction in N and P concentrations compared with the non-inoculated seedlings. While 60 mM and 120 mM NaCl treatments reduced final seed weight and seed number, P. indica inoculation partly alleviated these reductions.

Conclusions

The results demonstrated that the enhancement of salt tolerance in maize plants by P. indica involves reductions in root and shoot Na uptake and maintenance of the transmembrane root water transport which helped alleviate the effects of NaCl on gas exchange, nutrient uptake, and growth.