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<p>Phosphate-solubilizing bacteria offer a sustainable solution that can replace conventional chemical phosphorus fertilizers. The current research focuses on characterizing PSB strains isolated from Algerian agricultural soils, and the evaluation of a selected strain in promoting early tomato seedlings’ growth under varying chemical phosphorus inputs. The selected strain, S4, displayed key traits of plant growth promotion, counting nitrogen fixation, indole-3-acetic acid (23.7 ± 2.5&#xa0;µg/mL) and siderophores production, and 1-Aminocyclopropane-1-carboxylic acid (ACC) degradation activity. The strains’ 16&#xa0;S rDNA, confirmed 99.77% similarity with <i>Streptomyces phaeoluteigriseus</i>. Tomato seeds inoculated with S4, alone or in combination with reduced chemical phosphorus doses, exhibited significant improved growth. S4 combination with 75% and 50% of the standard fertilizer dose (1/2 eng S4 and 3/4 eng S4) resulted in the highest seedling fresh weight (FW), 22 days after sowing (56.25 and 75.5&#xa0;mg/plant, respectively vs. 49.75&#xa0;mg/plant: control), and the highest estimated total productivity in terms of dry weight (TPDW) (0.24 and 0.23&#xa0;g, respectively vs. 0.17&#xa0;g: control). Crucially, soil analysis showed that available phosphorus (AP) increased significantly in some inoculated treatments, with higher AP closely linked to increased FW (<i>r</i> = 0.8515), confirming that AP is directly linked to biomass production. After 41 days of growth, chlorophyll content was significantly higher in plants obtained by S4-inoculated seeds, particularly 1/4 eng S4 and 1/2 eng S4 treatments [2.45 and 2.38 CCI (Chlorophyll Content Index), respectively vs. 0.85 CCI: control]. These results suggest that <i>S. phaeoluteigriseus</i> S4 can be used to reduce chemical fertilizer use. Further trials are needed to validate its performance in open agricultural systems.</p>

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Plant growth promotion by a native Algerian Streptomyces phaeoluteigriseus: a potential bioinoculant for phosphorus mobilization in tomato cultivation

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Abdelwahab Rai,
  • Giulia Semenzato,
  • Aida Raio,
  • Ali Guettaf,
  • Manel Meslaoui,
  • Ait Kaci Mazari,
  • Ihdene Sofiane,
  • Mohamed Kebdani,
  • Abdeltif Amrane,
  • Lotfi Mouni

摘要

Phosphate-solubilizing bacteria offer a sustainable solution that can replace conventional chemical phosphorus fertilizers. The current research focuses on characterizing PSB strains isolated from Algerian agricultural soils, and the evaluation of a selected strain in promoting early tomato seedlings’ growth under varying chemical phosphorus inputs. The selected strain, S4, displayed key traits of plant growth promotion, counting nitrogen fixation, indole-3-acetic acid (23.7 ± 2.5 µg/mL) and siderophores production, and 1-Aminocyclopropane-1-carboxylic acid (ACC) degradation activity. The strains’ 16 S rDNA, confirmed 99.77% similarity with Streptomyces phaeoluteigriseus. Tomato seeds inoculated with S4, alone or in combination with reduced chemical phosphorus doses, exhibited significant improved growth. S4 combination with 75% and 50% of the standard fertilizer dose (1/2 eng S4 and 3/4 eng S4) resulted in the highest seedling fresh weight (FW), 22 days after sowing (56.25 and 75.5 mg/plant, respectively vs. 49.75 mg/plant: control), and the highest estimated total productivity in terms of dry weight (TPDW) (0.24 and 0.23 g, respectively vs. 0.17 g: control). Crucially, soil analysis showed that available phosphorus (AP) increased significantly in some inoculated treatments, with higher AP closely linked to increased FW (r = 0.8515), confirming that AP is directly linked to biomass production. After 41 days of growth, chlorophyll content was significantly higher in plants obtained by S4-inoculated seeds, particularly 1/4 eng S4 and 1/2 eng S4 treatments [2.45 and 2.38 CCI (Chlorophyll Content Index), respectively vs. 0.85 CCI: control]. These results suggest that S. phaeoluteigriseus S4 can be used to reduce chemical fertilizer use. Further trials are needed to validate its performance in open agricultural systems.