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It was documented that arbuscular mycorrhiza fungi (AMF) play an important role in protecting host plants against arsenic (As) contamination.However,most terrestrial ecosystems contain a considerable number of nonmycorrhizal plants.So far little information is available for the interaction of such non-host plants with AMF under As contaminations.By using a dual compartment cultivation system with a plastic board or a nylon mesh separating roots of non-host pepperweed from roots of the AM-host alfafa plants,avoiding direct root competition,the two plant species were grown separately or partially separated (with rhizosphere effects) in the presence or absence of the AMF Rhizophagus irregularis in As-contaminated soil.The results indicated that mycorrhiza caused phosphorus (P) concentration decrease in the non-host pepperweed,but promoted the P concentration of the AM host alfafa.Mycorrhiza is potentially helpful for non-host pepperweed to adapt to As contamination by decreasing root As concentration and showing no suppressing effect on biomass production.The study provides further evidence for the protective effects of AMF on non-host plants against As contamination,and improved our understanding of the potential role of AMF for non-host plant adaptation to As contaminated soils.