Our second hypothesis was that the benefit of AMF is more pronouncedunder conditions of drought. This hypothesis was partlyconfirmed. Plant performance data did not show a significant AM ×water interaction for root, shoot, and total biomass, however the interactionterm was significant for leaf area, indicating that under drierconditions mycorrhizal plants were able to maintain a larger leaf area,which subsequently could feed back on photosynthesis and hencebiomass performance over longer time periods.