Did you know that water can stay liquid at temperatures as low as -46 degrees Celsius? This unusual behavior is called supercooling. For water to freeze at warmer temperatures, it needs a catalyst, often a dust particle or a speck of bacteria that kickstarts crystallization.
Recently, researchers discovered that certain soil fungi can produce proteins that help water freeze even at -2 degrees Celsius (28.4 degrees Fahrenheit). Unlike bacteria, which need to be present as whole cells, these fungi release proteins that trigger freezing on their own.
Understanding how these fungi work could have big implications. For instance, they might help replace toxic chemicals used in weather modification, like cloud seeding, and improve the freezing process in food production.
Scientists have known since the 1970s that bacteria can act as natural ice-makers, but the role of fungi remained unclear. Advances in DNA sequencing helped researchers study the Mortierellaceae family of fungi, revealing that they share ice-making genes with bacteria. This connection happened through a process called horizontal gene transfer, where one organism takes genes from another.
“It’s rare for fungi to acquire genes from bacteria. So, I was surprised to see this shared trait,” said Boris Vinatzer, an environmental scientist involved in the study. The fungi adapted the bacterial genes into more efficient proteins that don’t rely on a cellular structure to work.
These fungal proteins could make artificial weather modification safer. Traditional cloud seeding often uses silver iodide, which can harm the environment. Fungal proteins, being natural and effective, may offer a cleaner solution.
Moreover, since these proteins can be isolated without the entire fungal cell, they could greatly enhance frozen food preservation and even medical applications. For instance, they might help freeze delicate biological tissues safely, preserving their integrity better than bacterial methods.
These findings could also impact climate science. Understanding how fungal proteins influence cloud formation may give new insights into weather patterns and climatic changes. The research highlights a previously overlooked factor in weather and environmental modeling.
In summary, these soil fungi have the potential to influence everything from agriculture to climate science. With their unique ice-making capabilities, they could lead us towards more sustainable practices.
The complete research details are available in Science Advances.
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