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<p>The over-reliance on chemical fertilizers poses a significant threat to environmental sustainability. Cyanobacteria-based fertilizers present a promising, eco-friendly alternative, yet their efficacy is often generalized, overlooking critical strain-specific effects. This study investigates the distinct impacts of two novel cyanobacterial strains <i>Nodosilinea</i> sp. HSaC_M1 and <i>Microcoleus</i> sp. LC_M4 on lettuce (<i>Lactuca sativa</i> L.) performance and soil nutrient dynamics. A controlled pot experiment was conducted with five treatments: <i>Nodosilinea</i> sp., <i>Microcoleus</i> sp., cow manure, urea, and control. Cyanobacterial strains were mass-cultured and applied as biofertilizers. Growth parameters, phytohormone production, plant nutrient uptake, and soil nutrient contents were measured. <i>Microcoleus</i> sp. LC_M4 produced significantly higher levels of indole-3-acetic acid (IAA), resulting in enhanced lettuce fresh weight and leaf number. Plant nutrient analysis revealed that <i>Microcoleus</i> sp. LC_M4 amendment resulted in the highest concentration of nitrogen (5.047%), potassium (90&#xa0;mg/g), iron (0.564&#xa0;mg/g), and zinc (156&#xa0;mg/kg), while <i>Nodosilinea</i> sp. HSaC_M1 contributed notably to manganese accumulation. Soil nutrient analysis showed that <i>Microcoleus</i> sp. enhanced soil nitrogen, iron, phosphorus, and total carbon, whereas <i>Nodosilinea</i> sp. improved soil potassium, manganese, and zinc levels. Overall, this research provides definitive evidence that cyanobacterial biofertilizers are not a homogeneous entity; their effects are highly strain-specific, influencing distinct aspects of plant physiology and soil properties. The strains <i>Microcoleus</i> sp. LC_M4 and <i>Nodosilinea</i> sp. HSaC_M1 are validated as potent biofertilizers that can mitigate chemical fertilizer use and advance sustainable horticultural practices.</p>

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Strain-specific effects of soil cyanobacteria Nodosilinea sp. and Microcoleus sp. on lettuce (Lactuca sativa L.) nutrient uptake and soil fertility

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Mekiso Yohannes Sido

摘要

The over-reliance on chemical fertilizers poses a significant threat to environmental sustainability. Cyanobacteria-based fertilizers present a promising, eco-friendly alternative, yet their efficacy is often generalized, overlooking critical strain-specific effects. This study investigates the distinct impacts of two novel cyanobacterial strains Nodosilinea sp. HSaC_M1 and Microcoleus sp. LC_M4 on lettuce (Lactuca sativa L.) performance and soil nutrient dynamics. A controlled pot experiment was conducted with five treatments: Nodosilinea sp., Microcoleus sp., cow manure, urea, and control. Cyanobacterial strains were mass-cultured and applied as biofertilizers. Growth parameters, phytohormone production, plant nutrient uptake, and soil nutrient contents were measured. Microcoleus sp. LC_M4 produced significantly higher levels of indole-3-acetic acid (IAA), resulting in enhanced lettuce fresh weight and leaf number. Plant nutrient analysis revealed that Microcoleus sp. LC_M4 amendment resulted in the highest concentration of nitrogen (5.047%), potassium (90 mg/g), iron (0.564 mg/g), and zinc (156 mg/kg), while Nodosilinea sp. HSaC_M1 contributed notably to manganese accumulation. Soil nutrient analysis showed that Microcoleus sp. enhanced soil nitrogen, iron, phosphorus, and total carbon, whereas Nodosilinea sp. improved soil potassium, manganese, and zinc levels. Overall, this research provides definitive evidence that cyanobacterial biofertilizers are not a homogeneous entity; their effects are highly strain-specific, influencing distinct aspects of plant physiology and soil properties. The strains Microcoleus sp. LC_M4 and Nodosilinea sp. HSaC_M1 are validated as potent biofertilizers that can mitigate chemical fertilizer use and advance sustainable horticultural practices.