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Water stress is one of the most important factors limiting growth and production of field crops in arid and semiarid regions. One approach to increase drought tolerance in crop plants is through the symbiotic effect of the arbuscular mycorrhizal (AM) fungi. Water deficit stress is typical to semi arid environments and most of the crop plants are affected by drought, during the flowering-grain filling periods. To study the symbiotic effect of the arbuscular mycorrhizal (AM) fungi On drought tolerance and some plant characteristics in sunflower, a field experiment was conducted in split plot arrangements using randomized complete blocks with four replications at the Research Field of Tarbiat Moddares University, Tehran, Iran in 2006 cropping season. Three soil available soil moisture contents; 40% (w1), 60% (w2) and 80% (w3) were assigned to main plots and two mycorrhiza species; Glomus mosseae, Glomus hoi and …