What is the primary role of mycorrhizae in relation to tree roots?

Mycorrhizae play a crucial role in enhancing the tree's ability to absorb water and essential minerals from the soil. These symbiotic fungi form a mutualistic relationship with tree roots, extending the root system's reach and surface area. This relationship allows the tree to access nutrients, such as phosphorus and potassium, that are otherwise difficult to absorb. Additionally, the presence of mycorrhizae can improve soil structure and increase the availability of water, which is vital for the tree's overall health and growth.

While mycorrhizae can provide some level of protection against soil pathogens, their primary function is centered around nutrient absorption. Similarly, other processes like nitrogen fixation and carbohydrate storage are important to trees but do not directly relate to the primary role of mycorrhizae in supporting water and mineral uptake.