SUMMARYPlants of Broinus inermis Leyss. inoculated or not with the mycorrhizal fungus Glomus fasciculatum (Thaxter sensu. Gerd.) Gerd. and Trappe, were pre-conditioned at two soil moisture levels (^^ -0-03 or -0-8 MPa) for 17 weeks, then subjected to a drying cycle. Stomatal conductance C?i), soil-plant liquid Bow resistance (i?s-p). ""d photosynthesis rates (P^ were measured before, during, and after the drying cycle. Soil water stress and mycorrbizal inoculation significantly reduced plant top dry weight during the 18 week study. Chlamydospore production by the mycorrhizal symbiont G. fascicutatum was significantly increased by soil water stress of -08 MPa. Foliar Ca and Mg concentrations were significantly greater in mycorrhizal plants. Foliar concentrations of P, K, N, Mn, Zn and Cu were significantly greater in drought stressed plants whereas Ca and Mg concentrations were significantly greater in well-watered plants.Mycorrhizal plants pre-conditioned at 4^^ -08 MPa had 36 and 34 "o lower Rg-ti values than nonmycorrhizal plants at pre and peak drought sampling times, respectively. Following re-irrigation, g^ was 64% greater in mycorrhizal plants when compared to nonmycorrhizal plants. Inoculation with G. fasciculatum increased photosynthesis rates by 20, 52, and 22 % over the noninoculated plants before, during, and after the drying cycle respectively. Despite increased rates of photosynthesis, top dry weight of mycorrhizal plants was IS % less than that of noninoeulated plants.Regardless of inoculation treatment, plants pre-conditioned at ^^ -0 8 MPa exhibited greater gj and Pg values during and after the drying cycle. Bromtis inermis demonstrated the ability to adapt to water deficits. Mycorrhizal symbiosis may play a role in the adaptation of B. inermis to dry sites.