Molecular genetics of arbuscular mycorrhizal symbiosis in cereals.
U. PASZKOWSKI (1) (1) University Cambridge, United Kingdom

The arbuscular mycorrhizal (AM) symbiosis is a fascinating mutualistic interaction between roots of most land plants and fungi of the phylum of the Glomeromycota. The development of this life-long alliance starts with reciprocal recognition of both partners in the rhizosphere, reprogramming both symbionts for the anticipated association. Upon successful recognition the interaction proceeds towards extensive root colonization which culminates in the formation of fungal feeding structures, the arbuscules, inside root cortex cells. As the arbuscule develops, the plant cell dramatically increases membrane biogenesis to envelope the growing hyphal structure. Thereby a hugely enlarged membrane surface area is created between the two organisms that appears ideal for the exchange of signals and nutrients. The nature and complexity of the establishment of AM symbioses must be the result of a well-orchestrated exchange of molecular signals. The nature of some of the signals has been discovered in recent years, providing a first insight into the type of chemical language spoken between the two symbiotic partners. My laboratory has taken genetics and lately advanced imaging approaches to elucidate the molecular mechanisms underpinning this apparently harmonious symbiosis. I will introduce some of our recent observations which have led us to propose fundamentally new communication mechanisms operating during this intimate plant-fungal partnership.


Abstract Number: P1-2
Session Type: Plenary