Keywords :
Economics and Econometrics; Agronomy and Crop Science; Food Science; Management, Monitoring, Policy and Law; Ecology; Geography, Planning and Development; Renewable Energy, Sustainability and the Environment
Abstract :
[en] Cyanobacteria-derived biostimulants can improve plant performance through microbiota modulation. We tested culture fractions of Limnospiraindica 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.
Funding text :
This article has been made possible through the author's involvement in the MELiSSA project, ESA\u2019s life support system program (https://www.esa.int/Enabling_Support/Space_Engineering_Technology/Melissa), and through the ARTEMiSS project (supported by ESA/PRODEX and BELSPO), providing the PhD grants of Ce\u0301cile Renaud. This work was made possible through the Projet Phenix Biocontrol, funded by the European Regional Development Fund (FEDER) and the Walloon Region (RW). The Bioprofiling platform used for monosaccharides analysis was supported by the European Regional Development Fund and the Walloon Region, Belgium.
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