ABSTRACT The aim of this Chapter is to review and integrate current knowledge of the impact of mycorrhizal symbioses on plant functioning
and adaptation with specific emphasis on P acquisition at various levels of cellular organization, from the molecular, biochemical
and physiological to the whole plant. Accordingly, the available information will be structured as follows: (i) mycorrhizas
as a plant strategy for P acquisition; (ii) fungal-plant integration to establish functional arbuscular mycorrhizal (AM) symbiosis;
(iii) functional biology of Pi uptake by AM plants; (iv) ecological impact of AM symbiosis on plant community structure and
productivity; and (v) mycorrhizosphere interactions and ecosystem P cycling.