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Purpose <p>The primary aim of this study was to explore the key physiological and metabolic responses of tigernut inoculated with the plant growth-promoting endophyte (PGPE) <i>Pantoea</i> sp. YSD J2 under varying NaCl concentrations.</p> Methods <p>The salt tolerance, colonization ability, and growth-promoting potential of YSD J2 were evaluated at different NaCl concentrations. The physiological and metabolic responses of tigernut inoculated with YSD J2 were also analyzed.</p> Results <p>YSD J2 exhibited remarkable salt tolerance and colonization ability under various NaCl levels, producing several growth-promoting substances, including indole-3-acetic acid (IAA) (2.20–23.23&#xa0;µg mL<sup>− 1</sup>), siderophores (1.00–3.50%), exopolysaccharides (EPS) (2.00–29.76&#xa0;mg mL<sup>− 1</sup>), biofilm (6.00–44.00&#xa0;mg mL<sup>− 1</sup>), phosphate solubilization (1.00–32.00&#xa0;µg mL<sup>− 1</sup>), and potassium solubilization (1.00–2.60). Inoculation with YSD J2 significantly enhanced plant growth under salt stress, improving shoot height (10.95–16.00%), root length (0.82–14.51%), shoot weight (52.02–143.57%), root weight (52.78–107.00%), relative water content (0.51–8.48%), and tiller number (33.33–283.33%). YSD J2 inoculation also increased chlorophyll content (31.87–118.18%), elevated the activities of peroxidase (POD) (6.74–21.90-fold), superoxide dismutase (SOD) (5.60–12.19%), and catalase (CAT) (25.00–52.63%), reduced malondialdehyde (MDA) levels (9.69–22.02%), and enhanced the accumulation of osmotic substances, including soluble sugar (18.93–45.05%), soluble protein (3.08–59.56%), and proline (10.86–12.94%). Additionally, YSD J2 inoculation reduced endogenous Na<sup>+</sup> accumulation while increasing K<sup>+</sup> and Ca<sup>2+</sup> absorption.</p> Conclusion <p>These results suggest that YSD J2 is a promising PGPE capable of improving plant growth, photosynthetic pigment content, antioxidant enzyme activities, osmotic regulation, and ion homeostasis, thereby mitigating the detrimental effects of salt stress in tigernut.</p>

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The Application of the Plant Growth-Promoting Endophyte Pantoea Sp. YSD J2 Alleviates the Salt Stress of Cyperus Esculentus L. Var Sativus

  • 期刊论文

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  • 发表日期：

    2025年12月15日

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  • Saisai Wang,
  • Yanna Huang,
  • Xueming Tang

摘要

Purpose

The primary aim of this study was to explore the key physiological and metabolic responses of tigernut inoculated with the plant growth-promoting endophyte (PGPE) Pantoea sp. YSD J2 under varying NaCl concentrations.

Methods

The salt tolerance, colonization ability, and growth-promoting potential of YSD J2 were evaluated at different NaCl concentrations. The physiological and metabolic responses of tigernut inoculated with YSD J2 were also analyzed.

Results

YSD J2 exhibited remarkable salt tolerance and colonization ability under various NaCl levels, producing several growth-promoting substances, including indole-3-acetic acid (IAA) (2.20–23.23 µg mL− 1), siderophores (1.00–3.50%), exopolysaccharides (EPS) (2.00–29.76 mg mL− 1), biofilm (6.00–44.00 mg mL− 1), phosphate solubilization (1.00–32.00 µg mL− 1), and potassium solubilization (1.00–2.60). Inoculation with YSD J2 significantly enhanced plant growth under salt stress, improving shoot height (10.95–16.00%), root length (0.82–14.51%), shoot weight (52.02–143.57%), root weight (52.78–107.00%), relative water content (0.51–8.48%), and tiller number (33.33–283.33%). YSD J2 inoculation also increased chlorophyll content (31.87–118.18%), elevated the activities of peroxidase (POD) (6.74–21.90-fold), superoxide dismutase (SOD) (5.60–12.19%), and catalase (CAT) (25.00–52.63%), reduced malondialdehyde (MDA) levels (9.69–22.02%), and enhanced the accumulation of osmotic substances, including soluble sugar (18.93–45.05%), soluble protein (3.08–59.56%), and proline (10.86–12.94%). Additionally, YSD J2 inoculation reduced endogenous Na+ accumulation while increasing K+ and Ca2+ absorption.

Conclusion

These results suggest that YSD J2 is a promising PGPE capable of improving plant growth, photosynthetic pigment content, antioxidant enzyme activities, osmotic regulation, and ion homeostasis, thereby mitigating the detrimental effects of salt stress in tigernut.