ABSTRACT: Citrus is one of the most important subtropical fruit trees that categorized under the salt sensitive horticultural crops. Arbascular mycorrhizal fungi (AM), by using a symbiotic relationship with plant root caused more accessibility of mineral nutrition in plants. In present study, two AM fungi (Glomus mosseae and Paraglomus occultum) and three level of salinity (50, 100 and 150 mM sodium chloride) in Flying Dragon seedling were evaluated. According to the results, with increasing of salinity levels mycorrhizal colonization percentage, relative water content, leaf number, leaf area, stem diameter, dry weight of root and shoot had decreased. Among the treatments, seedling in which inoculated with AM in compared with noninoculated treatments had shown significantly difference. Mycorrhizal fungi had significantly shown lower Na+ concentration and higher K+, Ca2+ concentration, ratio of K+/Na+ and Ca2+/Na+ ratio in root seedlings. Also, between two used AM fungi in some measured parameters significant difference were found, that indicated different genus of AM shown different responses to salinity. Furthermore, inoculation treatments had recorded less salinity stress conditions. Finally, suggested that AM symbiosis with using leaf osmotic adjustment and ionic balance could mediated adverse effects of salinity.

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