A recent study published in Plant Cell, Tissue and Organ Culture (PCTOC, 2025) explores how beneficial Bacillus bacteria interact with Lippia origanoides Kunth—a South American medicinal shrub known for its antioxidant and insecticidal properties—under simulated drought conditions created with PEG-6000.
Researchers from the Federal Rural University of Pernambuco tested microcuttings in four treatments: control, water stress alone, Bacillus biotization alone, and a combination of both. The Bacillus consortium (B. subtilis, B. megaterium, and B. cereus) promoted higher levels of chlorophyll b, soluble proteins, carbohydrates, amino acids, and nitrate—especially under non-stress conditions.
However, the study revealed that while biotization improved primary metabolism, it did not fully offset the growth reduction caused by drought. Under PEG-6000-induced stress, plant height, leaf number, and biomass declined, even with bacterial inoculation. The findings suggest that Bacillus biotization enhances metabolic preparedness and defense responses but its benefits are condition-dependent—most pronounced in well-hydrated systems.
The authors highlight that Bacillus-based inoculants may be valuable for improving in vitro acclimatization and stimulating defense-related metabolites useful for pharmaceuticals, cosmetics, and biopesticides. Future work should refine bacterial dosage and stress exposure to balance metabolic enhancement and growth performance.
Reference
Neri, M., de Oliveira, H. C. A., de Santana Silva, S. E., de Melo Pimentel, I. A., de Souza, E. B., & Ulisses, C. (2025). Effect of biotization with Bacillus inoculants on Lippia origanoides Kunth under PEG-6000-induced water stress. Plant Cell, Tissue and Organ Culture (PCTOC), 162(3), 79. https://doi.org/10.1007/s11240-025-03215-y
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