By Gina Myers, MEng ’20 (BIOE)
The mention of fungi often bears ideas of a deadly inoculation that is anything but desirable. The notion of pathology is understandable, after the destruction wrought by fungal diseases like Dutch Elm and Needle Blight. Though fungi have had their fair share of negative exposure, there’s more happening beneath the surface than meets the eye. Increasingly, the critical role fungi play in the health of terrestrial ecosystems is gaining attention-and deservedly so. Symbiotic fungi, termed “mycorrhizae”, provide enormous benefit to their vascular plant hosts. How exactly can they do this, and why are mycorrhizae so important to the earth in an era of changing ecosystems and climate crisis?
Climate change and human destruction are altering the world we live in.
With biodiverse habitats disappearing at a rate never before seen, the survival and resilience of the earth rely on the ability of the natural environment to grow and thrive. Mycorrhizae are present in over 90% of known vascular land plants (“Hidden Partners”). They are key drivers of nutrient uptake, water availability, and carbohydrate sourcing in an ecosystem. With an advanced understanding of this symbiotic system, new possibilities present themselves in the form of habitat engineering and bioremediation.

How exactly does the symbiosis between plants and mycorrhizae work?
In this interaction, each species derives sufficient benefit for the relationship for it to be evolutionarily favorable- even preferred. From the plant’s perspective, a fungal partner means increased nutrient and water availability, as well as a more robust root system. The fugal hyphae extend well beyond the roots of the plant, transporting water and nutrients far from the circumference of soil that the plant would be able to access. This means that the functional area available to the plant to reach what it needs from the soil is increased by up to 50 times (“Benefits of Mycorrhizae”). Genes that enable efficient nutrient assimilation and uptake are present in the fungal genome. These make key drivers of plant growth including nitrogen, phosphorus and potassium available to the plant (Ai-Hua, Ceccaroli) following assimilation by the fungus. Similarly, mycorrhizae absorb moisture from afar and transport it right to the plant’s roots (“Benefits of Mycorrhizae”). The fungi provide all this in return for easy access to carbohydrates, which are generated during the Calvin Cycle inside the plant cell using energy from the sun (Yang). These carbohydrates become available to the fungi through the root system of the plant and promote fungal growth by lowering the barrier to energy acquisition. Symbiotic interactions are orchestrated for each species and are foundational to the health of the ecosystem.By harnessing the power of mycorrhizal fungi, we can re-imagine forests to be robust and stable ecosystems.

Using fungi, we can halt and reverse the downward trajectory of terrestrial ecosystems in the modern era.
About the author:
Gina Myers is a natural leader and brings a fresh perspective to engineering and leadership from her interests in endurance sports and environmental stewardship. She is a top performer in all her endeavors and her background both as a culinary professional and bioengineer contains numerous honors. She received an Associate’s Degree in Culinary Arts from the Culinary Institute of America after graduating high school at age 16. She then made a sharp left turn away from the culinary world and obtained a bachelor’s degree in Biomedical Engineering from the University of the Pacific in just over three years. After an internship at the Broad Institute of MIT and Harvard studying KRAS cancer genetics and two years working at BioMarin Pharmaceuticals to develop a gene therapy cure for Hemophilia, she decided to invest in her entrepreneurial ambitions by attending UC Berkeley’s Fung Institute for Engineering Leadership, where she currently studies Bioengineering. Whether training for an ultramarathon or the Ironman triathlon world championships, working with a team to bring a microfluidic design to life, or passionately making the case for an environmental or political issue, her motivation and conceptual and organizational abilities are valued by her colleagues and mentors. Connect with Gina.References:
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Op-ed: How the filamentous underworld will help our forests survive was originally published in Berkeley Master of Engineering on Medium, where people are continuing the conversation by highlighting and responding to this story.