A fern's algae partner boosts its drug-cleaning power
Simião RB, Figueredo CC, Guimarães BLS, Gomes MP
Phytoremediation
The floating ferns that carpet garden ponds and rice paddies host a hidden algae partner that changes how well the whole system filters out human medications washing into the water.
Azolla is a small floating fern that lives with a partner algae called Nostoc tucked inside its leaves. Scientists dosed the fern with three common drugs (an antimalarial, a dewormer, and an antibiotic) and found that ferns with their algae partner handled the chemical stress far better, staying healthier and pulling more of the drugs out of the water than ferns without the partner. The algae seems to act like a built-in bodyguard and cleanup crew, changing both how tough the fern is and where the pollutants end up.
Key Findings
Ivermectin caused the strongest damage to photosynthesis and nitrogen processing, hydroxychloroquine had intermediate effects, and azithromycin was the mildest.
Ferns paired with Nostoc tolerated up to 100 times higher pollutant concentrations before showing physiological damage compared to ferns without the algae.
Symbiotic ferns removed azithromycin and ivermectin more efficiently while storing less in their tissue, but they both removed more hydroxychloroquine and retained more of it internally.
chevron_right Technical Summary
A tiny water fern removes drug pollutants from water more effectively when it partners with its symbiotic algae, and that partnership also shields the plant from the drugs' toxic effects. The findings suggest that natural plant-microbe teamwork could improve how we clean pharmaceutical waste from ponds and waterways.
Abstract Preview
Original paper
Symbiosis modulates pharmaceutical toxicity and contaminant fate in the Azolla-Nostoc system.
Pharmaceutical contamination in aquatic environments frequently occurs as complex mixtures; however, the extent to which biological interactions modify the toxicity and fate of contaminants remains...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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