ArticleBMC plant biology2026
Seed priming with Streptomyces griseoviridis culture filtrate: species-specific enhancement of legume germination and seedling vigor through hormonal and metabolic signaling.
Article in BMC plant biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundActinobacteria of the genus Streptomyces are recognized as prolific producers of bioactive metabolites capable of regulating plant growth and stress responses. However, isolate-level phytohormone data for Streptomyces griseoviridis, a commercially relevant biocontrol species, remain limited and sometimes contradictory.
resultsA strain of S. griseoviridis was isolated and molecularly characterized. High-performance liquid chromatography (HPLC) of its cell-free culture filtrate (CFF) revealed the presence of gibberellic acid (46.68 µg/100 mL), zeatin (18.90 µg/100 mL), indole-3-acetic acid (3.93 µg/100 mL), and abscisic acid (0.38 µg/100 mL), while gas chromatography-mass spectrometry (GC-MS) identified oleic acid (17.1%) and palmitic acid methyl ester (8.34%) as major metabolites. Seeds of Phaseolus vulgaris and Vicia faba were primed with varying concentrations of CFF. In P. vulgaris, the 25% CFF significantly enhanced germination percentage (GP; 66.7% vs. 60.0% control), germination energy (GE; 56.7 vs. 41.7), germination rate index (GRI; 4.02 vs. 3.11), stem length (20.80 vs. 16.10 cm), and total photosynthetic pigments (3.79 vs. 2.8 mg/g). In V. faba, the 10% CFF proved most effective, achieving 100% GP (control: 98.3%), increasing GE and GRI, reducing mean germination time, and elevating total pigments (3.11 vs. 1.86 mg/g). Regarding soluble metabolites, soluble protein content in P. vulgaris was maximized by the 25% and 50% CFF treatments, reaching 165.4 and 136.8 mg/g dry weight, respectively, compared to 108.9 mg/g in the control, while soluble sugars increased with 10% CFF concentrations. In V. faba, the highest soluble protein concentration (295.4 mg/g) was achieved at 10% CFF (control: 202.1 mg/g), whereas soluble sugars reached a maximum at 100% CFF. Molecular docking revealed compound 2-acetyl-3-(2-cinnamido)ethyl-7-methoxyindole (indole-related) exhibited strong binding to NCED1 (- 7.85 kcal/mol), CCD1 (- 9.21 kcal/mol), starch phosphorylase (- 7.03 kcal/mol), and AGPase (- 6.56 kcal/mol), outperforming controls and fatty acid derivatives.
conclusionThe culture filtrate of Streptomyces griseoviridis constituted a biologically active signaling pool capable of modulating legume primary metabolism and photosynthetic pigment profiles in a species- and concentration-dependent manner. This study provided novel isolate-level evidence of the hormonal and metabolic effects of S. griseoviridis filtrates and pointed out the potential of plant growth-promoting Streptomyces species as sustainable drivers of crop productivity and food security.
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