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<p>Eight oat rhizospheric actinomycetes (AM1, AM2, AM3, AM5, AM6, AM13, AM15, and AM24) have been characterized in our previous study for their phosphate solubilization abilities, siderophore production, and genetic diversity. In the present study, the eight selected strains were characterized for their plant growth promotion traits through several mechanisms. Results showed that the most active indole acetic acid (IAA) producers are <i>Streptomyces anulatus</i> (AM6), <i>Streptomyces griseoflavus</i> (AM2) and <i>Streptomyces sampsonii</i> (AM5) (37.64&#xa0;µg.mL<sup>− 1</sup>, 32.03&#xa0;µg.mL<sup>− 1</sup> and 30.10&#xa0;µg.mL<sup>− 1</sup>, respectively). All the strains were able to release soluble potassium from orthoclase and mica, and they were able to tolerate high concentrations of polyethylene glycol (PEG) 6000 (25%), which refers to drought stress tolerance. Only AM6, AM24, AM2, AM5, AM15, and AM13 produced hydrogen cyanide (HCN). Five strains were able to produce ammonia, whereas all were able to fix nitrogen. Moreover, the eight strains conferred biotic stress tolerance through resistance to several pathogens (Gram-positive and Gram-negative bacteria, yeast, and fungi). Furthermore, they were able to resist several synthetic antibiotics that limit pathogen growth. The most active strains among the tested Actinomycetes were AM2, AM5, and AM6. Our strains contribute to plant growth by facilitating biotic and abiotic stress tolerance and supporting plant nutrition. This could be considered in the framework of a biological approach to sustainable agriculture.</p>

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Potential use of phosphate solubilizing actinobacteria as plant enhancers: involvement in plant nutrition and stress tolerance

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Meriam Bousselham,
  • Yassine Aallam,
  • Driss Dhiba,
  • Younes Abbas,
  • Nezha Saidi,
  • Hanane Hamdali

摘要

Eight oat rhizospheric actinomycetes (AM1, AM2, AM3, AM5, AM6, AM13, AM15, and AM24) have been characterized in our previous study for their phosphate solubilization abilities, siderophore production, and genetic diversity. In the present study, the eight selected strains were characterized for their plant growth promotion traits through several mechanisms. Results showed that the most active indole acetic acid (IAA) producers are Streptomyces anulatus (AM6), Streptomyces griseoflavus (AM2) and Streptomyces sampsonii (AM5) (37.64 µg.mL− 1, 32.03 µg.mL− 1 and 30.10 µg.mL− 1, respectively). All the strains were able to release soluble potassium from orthoclase and mica, and they were able to tolerate high concentrations of polyethylene glycol (PEG) 6000 (25%), which refers to drought stress tolerance. Only AM6, AM24, AM2, AM5, AM15, and AM13 produced hydrogen cyanide (HCN). Five strains were able to produce ammonia, whereas all were able to fix nitrogen. Moreover, the eight strains conferred biotic stress tolerance through resistance to several pathogens (Gram-positive and Gram-negative bacteria, yeast, and fungi). Furthermore, they were able to resist several synthetic antibiotics that limit pathogen growth. The most active strains among the tested Actinomycetes were AM2, AM5, and AM6. Our strains contribute to plant growth by facilitating biotic and abiotic stress tolerance and supporting plant nutrition. This could be considered in the framework of a biological approach to sustainable agriculture.