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<p>Microbial Exopolysaccharides (EPS) are high-molecular-weight, sugar-based polymers secreted by diverse microbes, with broad applications in both medicine and industry. However, their use in agriculture remains limited. The potential of crude bacterial EPS to alleviate water stress in tomato plants was evaluated. The experiment was set up following a randomized complete block design with two factors. Factor 1 was the watering treatment, applied at two levels: well-watered (WW; 75% of soil field capacity, FC) and drought-stressed (WS; 35% of FC). While Factor 2 was the treatment with the bacterial strain or its EPS, applied at three levels [non-inoculation and no EPS application (Control), Inoculation with A5 strain (A5), and the application of EPS (EPS). Water stress markedly reduced the growth, physiology and biochemical traits of tomato plants. Nevertheless, both the bacterial inoculation and EPS application improved plant growth and physiological traits under stress conditions. Under WS, EPS increased stomatal conductance (gs) by 28% and leaf water potential (Leaf Ψ) by 47%. In comparison, under the same conditions, the A5 treatment improved these parameters by 23% and 45%, respectively, highlighting the strong potential of EPS relative to A5. These results highlighted the functionality of bacterial EPS as a promising strategy to enhance plant tolerance to drought. However, additional studies are required to fully understand and harness their agricultural potential.</p>

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Elucidating the Functional Role of Bacterial Exopolysaccharides in Modulating Tomato Responses to Water Stress

  • 期刊论文

  • 发表日期：

    2026年5月19日

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  • Abdel-ilah Tahiri,
  • Anas Raklami,
  • Aiman Slimani,
  • Abdelilah Meddich,
  • Khalid Oufdou

摘要

Microbial Exopolysaccharides (EPS) are high-molecular-weight, sugar-based polymers secreted by diverse microbes, with broad applications in both medicine and industry. However, their use in agriculture remains limited. The potential of crude bacterial EPS to alleviate water stress in tomato plants was evaluated. The experiment was set up following a randomized complete block design with two factors. Factor 1 was the watering treatment, applied at two levels: well-watered (WW; 75% of soil field capacity, FC) and drought-stressed (WS; 35% of FC). While Factor 2 was the treatment with the bacterial strain or its EPS, applied at three levels [non-inoculation and no EPS application (Control), Inoculation with A5 strain (A5), and the application of EPS (EPS). Water stress markedly reduced the growth, physiology and biochemical traits of tomato plants. Nevertheless, both the bacterial inoculation and EPS application improved plant growth and physiological traits under stress conditions. Under WS, EPS increased stomatal conductance (gs) by 28% and leaf water potential (Leaf Ψ) by 47%. In comparison, under the same conditions, the A5 treatment improved these parameters by 23% and 45%, respectively, highlighting the strong potential of EPS relative to A5. These results highlighted the functionality of bacterial EPS as a promising strategy to enhance plant tolerance to drought. However, additional studies are required to fully understand and harness their agricultural potential.