Mycorrhizal fungi have a positive role in moderating the devastating effects of drought in most plants; on this basis to determine the effects of inoculation ofroots ofgrape varSefidbidanehwith three species of Mycorrhizal fungi namelyGlomusfasiculatum, Glomusintraradices and Glomusmosseae on the amount of chlorophyll, soluble sugars,betaine glycine and proline under water stress, the present study was conducted as a factorial experiment based onrandomizedcomplete block design in four eplications.Compared to control treatment,inoculating with Mycorrhizal fungi could have significant effectson aforementioned traits so that the amount of betaine glycine, proline and soluble sugars increasedbut chlorophyll decreasedin control. The highestamounts of soluble sugars,betaine glycine and proline were observedatthe irrigation levelof 25% of stress. Furthermore, the highest amount of chlorophyll was related to the irrigation levels of 50% and 75%. At all levels of interaction between fungus and moisture stress, the highest amount of proline synthesis was observed in control,indicatingthe positive role of Mycorrhizal fungi in moderating the negative effects of water stress and in increasingof water absorption in drought stress conditions.

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