Researchers have found that tormentil, a yellow wildflower long used in traditional herbal medicine across Britain and Ireland, may help combat dangerous antibiotic-resistant bacteria. The discovery comes as scientists worldwide seek new treatments to address the growing threat of antimicrobial resistance.
Tormentil May Offer New Hope in Fight Against Superbugs
Long before the development of modern antibiotics, plant-based remedies were widely used to treat infections and wounds. One such plant was tormentil (Potentilla erecta), a small yellow wildflower native to the UK, Ireland and much of Europe.
Historically, tormentil root was used in traditional medicine to treat wounds, sore throats, diarrhoea and gum disease. Those longstanding medicinal uses led researchers to suspect the plant may contain compounds capable of fighting harmful microbes.
New research now suggests tormentil not only has antimicrobial properties, but could also help tackle bacteria resistant to conventional antibiotics.
Why Antimicrobial Resistance Is a Growing Concern
Antimicrobial resistance occurs when bacteria evolve to survive medicines designed to kill them. As resistance increases, once-routine infections can become harder — and in some cases impossible — to treat.
Health experts have repeatedly warned that antimicrobial resistance is one of the most serious global public health threats, raising concerns that medicine could return to a pre-antibiotic era in which common infections become life-threatening.
Against that backdrop, scientists are increasingly exploring natural sources for new antimicrobial compounds. Plants are considered particularly promising because they have evolved over millions of years to produce defensive chemicals against microbes.
Study Tested More Than 70 Bogland Plants
In the latest study, researchers examined whether bogland plants collected across Ireland contained compounds capable of fighting multidrug-resistant bacteria.
Extracts were prepared from more than 70 plant species and tested in laboratory conditions against clinically significant bacterial pathogens, including bacteria associated with severe pneumonia and urinary tract infections.
Scientists used antimicrobial susceptibility testing to assess whether the plant extracts could inhibit bacterial growth. They also investigated whether the extracts could disrupt biofilms — protective bacterial communities that shield microbes from antibiotics, disinfectants and the immune system.
The initial results showed tormentil extracts displayed antimicrobial activity and reduced biofilm formation, suggesting the plant contains compounds that may explain its historical medicinal use.
Tormentil Enhanced the Effectiveness of Last-Resort Antibiotics
Researchers also explored whether tormentil could work alongside existing antibiotics.
They combined tormentil extract with low doses of colistin, a powerful antibiotic typically reserved as a last-line treatment for severe infections because of its potential toxicity.
While the low dose of colistin alone was insufficient to kill the bacteria, combining it with tormentil extract significantly improved the antibiotic’s effectiveness.
This suggests compounds within the plant may help boost the performance of existing antimicrobial drugs.
Key Compounds Identified in Tormentil
Further chemical analysis identified several naturally occurring compounds within the tormentil extracts, including ellagic acid and agrimoniin — substances already known for their antioxidant and anti-inflammatory properties.
When tested individually, both compounds were found to inhibit bacterial growth.
Researchers believe these substances may be largely responsible for tormentil’s antimicrobial effects.
How the Plant Compounds Attack Bacteria
The study found that tormentil’s active compounds appear to work by scavenging iron from their surroundings.
Iron is essential for bacterial growth and survival. By depriving bacteria of this nutrient, the compounds effectively starve bacterial cells and prevent them from multiplying.
Scientists are now working to optimise the compounds’ antimicrobial properties and develop formulations for further testing in experimental treatment models.
Natural Medicines Could Help Shape Future Antibiotics
Nature has long played a central role in medicine development. Many antibiotics currently used in modern healthcare originate from natural sources.
For example, vancomycin — a last-resort antibiotic used to treat serious infections including MRSA and Clostridioides difficile — was originally derived from soil microbes.
Researchers say plants remain a relatively underexplored source of both entirely new antimicrobial agents and compounds that can enhance the effectiveness of existing antibiotics.
Conclusion
The findings suggest that tormentil, a familiar wildflower found across the British countryside, could one day contribute to the fight against antibiotic-resistant infections.
While further research is needed before any clinical treatment becomes available, the study highlights how traditional remedies and modern science may work together to uncover new solutions to urgent medical challenges — sometimes in the most unassuming of places.
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