VA mycorrhizal infection and the morphology and function of root systems

VA mycorrhiza induces morphogenetic modifications in the root system of the host plant. This topic is discussed taking into account the possible significance of functional changes, as related to nutrient absorbing strategies. Modelling, topological analysis and cytological techniques are presented as useful tools for root investigation. Modelling may reveal developmental trends, and topological analysis may help to interpret the functional significance of developmental patterns. Root meristem activity and structure have been particularly considered and related to root system architecture. Finally, the bases of the morphogenetic effects of the fungus, whether they are nutritional or hormonol, are discussed.