Azolla, a tiny aquatic fern, might not seem like much at first glance. Floating on ponds and lakes, it’s the kind of plant ducks feast on in wetland areas. But behind its humble appearance lies a plant with enormous potential to combat climate change, enrich soils, and maybe even become a staple food for humans in the future. New research is now suggesting that this fast-growing fern, which houses a unique strain of cyanobacteria, may be nontoxic, paving the way for its use as a novel food source, livestock feed, and biofuel.
The Special Relationship Between Azolla and Cyanobacteria
For years, scientists were cautious about Azolla’s potential as food because of the cyanobacteria it contains. Cyanobacteria, or blue-green algae, are notorious for producing toxins that can contaminate freshwater and pose serious health risks to humans and animals. These toxins have been linked to conditions like ALS, Parkinson’s disease, and liver and kidney failure. In some cases, they produce anatoxin-a, also known as the “Very Fast Death Factor,” due to its severe toxicity.
Image Source: CABI
However, the cyanobacteria inside Azolla are different. Researchers from Penn State recently discovered that the strain of cyanobacteria living within Azolla does not produce these harmful toxins. Unlike other cyanobacteria, which use toxins to protect themselves from being eaten, this strain has evolved to coexist peacefully with the plant. In exchange for shelter, it helps the fern by fixing nitrogen—a key nutrient for plant growth. This discovery removes one of the biggest barriers to Azolla’s use as food or livestock feed.
Also Read: These 15 Meat and Dairy Companies Emit As Much Methane As The EU | Livestock Methane Emissions
Why Azolla Could Be a Game-Changer
Azolla is already used by some smallholder farmers as a natural fertilizer. Its nitrogen-fixing ability makes it an excellent alternative to synthetic fertilizers, which not only produce greenhouse gases but also contribute to pollution in rivers and lakes. Azolla’s rapid growth rate—it can double its biomass every two days—means that farmers can quickly generate a significant amount of plant material, providing a constant supply of fertilizer or animal feed.
The plant’s nutritional profile is impressive, too. Azolla is rich in protein and essential nutrients such as potassium, zinc, iron, and calcium. While some species of Azolla contain high levels of polyphenols, which can be harmful in large amounts, research has found that Carolina Azolla—a species native to the southeastern U.S.—has much lower levels of these compounds. Better yet, cooking can reduce those levels further, making it safer for consumption.
In the 1980s and 1990s, Chinese farmers grew Azolla in their flooded rice paddies, using it as both a fertilizer and a food source for fish. The process was labour-intensive, but it demonstrated the plant’s versatility. Unfortunately, farmers eventually abandoned Azolla in favour of cheap synthetic fertilizers, which were easier to manage. However, with growing interest in sustainable agriculture, researchers believe Azolla could make a comeback, especially with new methods to industrialize its production.
Also Read: How Sorghum is Leading the Way in Reducing Nitrogen Loss and Greenhouse Gases
Potential Beyond Agriculture
Azolla’s uses don’t stop at farming. Researchers are also looking into its potential as a biofuel. Like other biofuels made from crops such as corn, Azolla-based fuel would be close to carbon-neutral. As the plant grows, it captures carbon dioxide from the atmosphere. When burned as fuel, the carbon is released back into the air, creating a balanced cycle. This makes it an attractive option for reducing reliance on fossil fuels.
In addition, Azolla could play a significant role in carbon sequestration. By incorporating the plant into the soil as a fertilizer, farmers could lock away more carbon in the ground, helping to mitigate climate change. This dual ability to capture carbon both in the air and the soil adds to Azolla’s appeal as a climate-friendly crop.
Also Read: Algal Biofuels: The Third-Generation Biofuels
The Future of Azolla
While the potential of Azolla is immense, there are still hurdles to clear before it becomes a widespread solution. Further research is needed to confirm its safety for human consumption. As of now, no one is recommending that people start foraging Azolla from ponds and eating it. However, the fact that it harbours nontoxic cyanobacteria opens up new possibilities for developing it as a food source in the future.
Selective breeding could help optimize Azolla for different uses. Scientists could create new varieties with more vitamins, higher protein content, or better nitrogen-fixing capabilities. Similar to how humans have shaped crops like wheat and corn over centuries, Azolla could undergo a transformation into a highly nutritious and versatile crop that supports both human and environmental health.
Azolla has already proven itself as a useful plant in the agricultural world, but its future potential is even greater. With new research confirming that its cyanobacteria partner is nontoxic, Azolla could soon find its way into new markets—as food, livestock feed, biofuel, and fertilizer. As climate change pushes the world to seek more sustainable solutions, Azolla stands out as a promising, climate-friendly option that can help reduce reliance on synthetic fertilizers, capture carbon, and even provide a new source of nutrition.
The journey from ponds to plates is still in its early stages, but Azolla’s potential to contribute to a more sustainable future is undeniable. Whether as a source of biofuel or a novel crop for food, Azolla might soon become an essential part of the global effort to fight climate change and ensure food security.
Also Read: Researchers Develop New Enzyme to Break Down Plastic Waste: TPADO
Лично я озабочен проблемой очистки и рециркуляции фекальной воды.
После дезактивации такие стоки содержат много минеральных веществ… и азолла вполне может поглощать эти вещества.