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<p>Cyanobacteria-derived biostimulants can improve plant performance through microbiota modulation. We tested culture fractions of <i>Limnospira</i> <i>indica</i> on tomato (<i>Solanum lycopersicum</i>), focusing on growth and root-associated communities. Nitrogen deprivation in <i>L. indica</i> cultures increased significantly the polysaccharide content, including EPS (EPS 0.05% in N<sup>+</sup> to 0.15% in N<sup>−</sup>; protein/polysaccharide ratio: 8 in N<sup>+</sup> to 0.5 in N<sup>−</sup>). Residual culture medium (CM) and biomass extract (BME) from nitrate-rich and nitrate-deficient cultures, were applied as soil amendments or foliar sprays. EPS-rich CM N<sup>−</sup> significantly enhanced flower production (49.8%, <i>p</i>-value = 0.005), while foliar BME N<sup>−</sup> increased fruit yield (<i>p</i>-value = 0.008). 16S rRNA profiling revealed distinct rhizosphere and endosphere shifts, including enrichment of plant growth-promoting genera (Acidovorax, Devosia, Massalia). Notably, foliar CM N<sup>−</sup> reshaped root microbiota, suggesting EPS-mediated systemic effects on plant metabolism and root microbiome assembly. This highlights the residual culture media as a biostimulant, offering new economic advantages.</p>

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Biostimulatory effects of Limnospira indica on the modulation of rhizosphere and endosphere microbiota and its impact on plant growth

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月13日

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  • Cécile Renaud,
  • Alice Delacuvellerie,
  • Pauline Largeteau,
  • Cyril Mascolo,
  • Ruddy Wattiez

摘要

Cyanobacteria-derived biostimulants can improve plant performance through microbiota modulation. We tested culture fractions of Limnospira indica on tomato (Solanum lycopersicum), focusing on growth and root-associated communities. Nitrogen deprivation in L. indica cultures increased significantly the polysaccharide content, including EPS (EPS 0.05% in N+ to 0.15% in N−; protein/polysaccharide ratio: 8 in N+ to 0.5 in N−). Residual culture medium (CM) and biomass extract (BME) from nitrate-rich and nitrate-deficient cultures, were applied as soil amendments or foliar sprays. EPS-rich CM N− significantly enhanced flower production (49.8%, p-value = 0.005), while foliar BME N− increased fruit yield (p-value = 0.008). 16S rRNA profiling revealed distinct rhizosphere and endosphere shifts, including enrichment of plant growth-promoting genera (Acidovorax, Devosia, Massalia). Notably, foliar CM N− reshaped root microbiota, suggesting EPS-mediated systemic effects on plant metabolism and root microbiome assembly. This highlights the residual culture media as a biostimulant, offering new economic advantages.