The chapter by Marscner and Dell examines the role of mycorrhizal fungi in nutrient acquisition by host plants, focusing on three types of mycorrhizas: ectomycorrhizas (ECM), ericoid mycorrhizas (EM), and vesicular-arbuscular mycorrhizas (VAM). Mycorrhizal infection can enhance plant growth by increasing nutrient uptake through the fungus, modifying transpiration rates, and altering rhizosphere microflora composition. The external hyphae of VAM can deliver significant amounts of plant nutrients, including phosphorus (P), nitrogen (N), potassium (K), zinc (Zn), and copper (Cu). However, studies on nutrient uptake by ECM are limited. ECM and EM fungi produce ectoenzymes that help plants access organic N and P forms, which are typically unavailable to VAM fungi or non-mycorrhizal roots. Further research is needed to quantify nutrient uptake and transport by fungal hyphae and to understand the regulation at the fungal-plant interface. The chapter also highlights the trade-off between mycorrhizal benefits and the cost of forming and maintaining mycorrhizal structures, which can affect shoot:root dry weight ratios. Differences in nutrient uptake mechanisms between ECM and VAM are discussed, emphasizing the importance of host plant genotype, VAM species, and soil conditions in nutrient uptake efficiency.The chapter by Marscner and Dell examines the role of mycorrhizal fungi in nutrient acquisition by host plants, focusing on three types of mycorrhizas: ectomycorrhizas (ECM), ericoid mycorrhizas (EM), and vesicular-arbuscular mycorrhizas (VAM). Mycorrhizal infection can enhance plant growth by increasing nutrient uptake through the fungus, modifying transpiration rates, and altering rhizosphere microflora composition. The external hyphae of VAM can deliver significant amounts of plant nutrients, including phosphorus (P), nitrogen (N), potassium (K), zinc (Zn), and copper (Cu). However, studies on nutrient uptake by ECM are limited. ECM and EM fungi produce ectoenzymes that help plants access organic N and P forms, which are typically unavailable to VAM fungi or non-mycorrhizal roots. Further research is needed to quantify nutrient uptake and transport by fungal hyphae and to understand the regulation at the fungal-plant interface. The chapter also highlights the trade-off between mycorrhizal benefits and the cost of forming and maintaining mycorrhizal structures, which can affect shoot:root dry weight ratios. Differences in nutrient uptake mechanisms between ECM and VAM are discussed, emphasizing the importance of host plant genotype, VAM species, and soil conditions in nutrient uptake efficiency.