Broad-spectrum antifungal activity and genome-guided characterization of Paenibacillus polymyxa CACC1094 isolated from the bovine rumen.
Lee S, Song J, Kim Y
Biocontrol
Fusarium and other mold diseases quietly devastate vegetable gardens and orchards every season — and this gut bacterium from cattle produces natural compounds that stop them cold, potentially without harsh chemicals.
Scientists found a helpful bacterium inside a cow's digestive system that can fight off many different types of harmful fungi — the same kinds that rot crops, kill seedlings, and spread plant disease. By reading the bacterium's entire genetic code, they confirmed it naturally makes two specific antifungal molecules called fusaricidins. These compounds worked against a surprisingly wide range of fungal threats, including ones that attack both crops and animals, suggesting this cow-gut microbe could be developed into an eco-friendly plant protectant.
Key Findings
The bacterium's genome is 5.55 million base pairs long and contains 13 gene clusters for producing bioactive compounds, including two confirmed antifungal molecules (fusaricidin A and B) validated by chemical analysis.
CACC1094 showed broad antifungal activity in lab tests against multiple plant-pathogenic fungi and oomycetes (the mold-like organisms that cause diseases like late blight), as well as clinically relevant yeast and fungal pathogens.
The strain was isolated from bovine rumen — an unusual non-soil environment — and its genome also carries a complete CRISPR-Cas immune system, suggesting it evolved robust defenses in the competitive microbial world inside a cow's gut.
chevron_right Technical Summary
Researchers discovered a bacterium living inside a cow's stomach that produces natural antifungal compounds capable of killing a wide range of fungal crop diseases. This strain, found in an unexpected animal source rather than soil, could become a new biological tool for protecting plants without synthetic fungicides.
Abstract Preview
While Paenibacillus polymyxa is widely recognized for its biocontrol capabilities, most characterized strains originate from soil or rhizosphere environments, leaving animal-associated populations ...
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