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Asked by Soujanya Last Modified
Mycorrhizal associations are symbiotic relationships between fungi and plant roots, where the fungi colonize the root system of the plant. These associations play a crucial role in enhancing the absorption of water and minerals in plants through several mechanisms:
Increased Surface Area: The fungal hyphae form a dense network around the plant roots, significantly increasing the surface area available for nutrient absorption. This expanded surface area allows for more efficient uptake of water and minerals from the soil.
Enhanced Nutrient Uptake: Mycorrhizal fungi have specialized structures called hyphae, which extend into the surrounding soil and can penetrate tiny soil crevices inaccessible to plant roots. These hyphae release enzymes that break down organic matter in the soil, releasing nutrients such as phosphorus, nitrogen, and micronutrients. The fungi then absorb these nutrients and transfer them to the plant roots, facilitating their uptake by the plants.
Improved Water Absorption: The extensive network of fungal hyphae acts like a sponge, increasing the soil's water-holding capacity. This allows mycorrhizal plants to access water from a larger volume of soil, even during periods of drought or water scarcity. The hyphae can also transport water directly to the plant roots, reducing the distance water molecules need to travel through the soil to reach the roots.
Nutrient Exchange: Mycorrhizal fungi and plant roots engage in a mutualistic exchange of nutrients. The fungi supply the plant with essential minerals and water extracted from the soil, while the plant provides the fungi with carbohydrates produced through photosynthesis. This nutrient exchange enhances the overall nutrient status of the plant and promotes its growth and development.
Overall, mycorrhizal associations significantly improve the absorption of water and minerals in plants by increasing surface area, enhancing nutrient uptake, improving water retention in the soil, and facilitating nutrient exchange between fungi and plant roots. This symbiotic relationship benefits both the plants and the fungi involved, promoting their mutual growth and survival in diverse environmental conditions.
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