Soil salinization is a global environmental problem. Arbuscular mycorrhizal (AM) fungi are capable of enhancing plant resistance to stress, for instance, improving plant tolerance to salinity stress. A pot experiment was carried out to determine the effects of AM fungi (Funneliformis mosseae, Rhizophagus intraradices, or F. mosseae and R. intraradices combined) and five different NaCl levels on the growth and physiology of Tagetes erecta under greenhouse conditions. The results showed that dual inoculation with F. mosseae and R. intraradices significantly increased total root length, root surface area, root volume, and root tip number of T. erecta plants under salt stress. Inoculation with AM fungi inhibited Na + accumulation in leaves and promoted the absorption of N, P, K, and Ca in leaves, and thus increased ratios of
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