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<p>Soil salinization and heavy metals (HMs) significantly impact agricultural productivity, necessitating eco-friendly solutions. This study investigates the impact of sodium chloride (NaCl) and arsenic (As) stress on tomato seedlings and evaluates the stress-alleviating potential of mannitol and a&#xa0;halophilic bacterium, <i>Nitratireductor aquimarinus </i>SPSB2. Our results revealed that bacteria strain SPSB2 forms a&#xa0;symbiotic relationship with tomato plants, modulating secondary metabolites and antioxidant responses. Under NaCl and As stress, tomato seedling growth was significantly reduced, but this reduction was mitigated by SPSB2 and mannitol treatments. SPSB2 inoculation significantly enhanced plant growth, increasing shoot and root length by 84.8 and 152.5%, respectively under NaCl stress. Similarly, under As stress shoot and root weights increased by 63.1 and 45.5%, respectively. SPSB2 also improved chlorophyll&#xa0;a, b, and carotenoid contents by 76.3%, 78%, and 50%, under As stress. Furthermore, treatments with SPSB2 and mannitol increased enzymatic (catalase, polyphenol oxidases) and non-enzymatic (flavonol, protein, sugar, starch) components, indicating their stress-alleviating roles. However, no synergistic effect was observed when both treatments were combined. SPSB2 demonstrated better efficacy than mannitol in improving tomato tolerance to salinity and HMs, improving growth and physiological attributes. These findings contribute to the understanding of environmentally friendly strategies for managing soil salinization and HMs contamination in agriculture. However, further field trials are required before recommending the SPSB2 strain for microbial-assisted phytoremediation of polluted soils.</p>

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Exploring the Mechanisms of Halophilic Bacterium SPSB2 and Mannitol in Mitigating Sodium Chloride and Arsenic Stress in Solanum Lycopersicum

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Lubna,
  • Muhammad Aizaz,
  • Shima Ahmed Ali Alrumaidhi,
  • Rawan Ahmed Mohammed Alhinai,
  • Reem Saif Mohammed A. L. Kalbani,
  • Ibrahim Khan,
  • Saqib Bilal,
  • Sajjad Asaf,
  • Ahmed AL-Harrasi

摘要

Soil salinization and heavy metals (HMs) significantly impact agricultural productivity, necessitating eco-friendly solutions. This study investigates the impact of sodium chloride (NaCl) and arsenic (As) stress on tomato seedlings and evaluates the stress-alleviating potential of mannitol and a halophilic bacterium, Nitratireductor aquimarinus SPSB2. Our results revealed that bacteria strain SPSB2 forms a symbiotic relationship with tomato plants, modulating secondary metabolites and antioxidant responses. Under NaCl and As stress, tomato seedling growth was significantly reduced, but this reduction was mitigated by SPSB2 and mannitol treatments. SPSB2 inoculation significantly enhanced plant growth, increasing shoot and root length by 84.8 and 152.5%, respectively under NaCl stress. Similarly, under As stress shoot and root weights increased by 63.1 and 45.5%, respectively. SPSB2 also improved chlorophyll a, b, and carotenoid contents by 76.3%, 78%, and 50%, under As stress. Furthermore, treatments with SPSB2 and mannitol increased enzymatic (catalase, polyphenol oxidases) and non-enzymatic (flavonol, protein, sugar, starch) components, indicating their stress-alleviating roles. However, no synergistic effect was observed when both treatments were combined. SPSB2 demonstrated better efficacy than mannitol in improving tomato tolerance to salinity and HMs, improving growth and physiological attributes. These findings contribute to the understanding of environmentally friendly strategies for managing soil salinization and HMs contamination in agriculture. However, further field trials are required before recommending the SPSB2 strain for microbial-assisted phytoremediation of polluted soils.