Flat-growing soil bacteria clean up toxic pyrene faster than tall-clumping relatives
Naloka K, Suzuki S, Vejarano F, Sonthiphand P, Pombubpa N
Soil Health
Garden and farm soil near roads, burn piles, or old industrial sites can hold pyrene-type pollutants, and this work shows that how soil microbes spread across surfaces can decide how well they clean it up.
Researchers compared two soil bacteria that are almost genetic twins and both know how to eat pyrene, a pollutant left by burning fuel and wood. One spread out in a thin, wide film and removed about 1.5 times more pyrene in still conditions. The other piled up into thick, tall clumps and got less done, which suggests that shape and layout matter, not just the tools a microbe carries.
Key Findings
Smooth-morphotype strain PO1-S removed approximately 1.5-fold more pyrene than rough-morphotype strain D3-R under static, diffusion-limited conditions.
Real-time imaging showed PO1-S formed flat, laterally spreading biofilms while D3-R formed dense, vertically structured biofilms.
Both strains carried complete, highly conserved pyrene degradation pathways, while transcriptomics showed differences in genes for extracellular polymeric substance synthesis, cell envelope remodeling, membrane transport, and regulation.
chevron_right Technical Summary
Two nearly identical soil bacteria that both carry the genes to break down pyrene, a toxic pollutant, cleaned it up at different rates. The one that grew flat, spreading biofilms removed about 1.5 times more pyrene than the one that grew tall, dense biofilms, so how bacteria arrange themselves matters as much as their genes.
Abstract Preview
Original paper
Integrating real-time imaging and transcriptomics reveals morphotype-associated differences in biofilm architecture and pyrene removal by Mycolicibacterium parafortuitum.
Polycyclic aromatic hydrocarbons are persistent environmental contaminants whose biodegradation is often constrained by low bioavailability, particularly under static and diffusion-limited conditio...
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