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Aims: After the determination of the toxic but nonlethal concentration of NaCl for cucumber, we examined the interaction between an ACC (1‐aminocyclopropane‐1‐carboxylate) deaminase producing bacterial strain and an arbuscular mycorrhizal fungus (AMF) and their effects on cucumber growth under salinity.

Methods and Results: In the first experiment, cucumber seedlings were exposed to 0·1, 50, 100 or 200 mmol l⁻¹ NaCl, and plant biomass and leaf area were measured. While seeds exposed to 200 mmol l⁻¹ NaCl did not germinate, plant growth and leaf size were reduced by 50 or 100 mmol l⁻¹ salt. The latter salt cancentration caused plant death in 1 month. In the second experiment, seeds were inoculated with the ACC deaminase‐producing strain Pseudomonas putida UW4 (AcdS⁺), its mutant unable to produce the enzyme (AcdS⁻), or the AMF Gigaspora rosea BEG9, individually …