Global food security faces mounting pressure from population growth, climate change, and deteriorating soil conditions. Rhizospheric microbial communities (rhizobiomes) play a key role in plant physiology, enhancing growth and tolerance to abiotic stress. To explore their potential contribution to plant resilience in extreme environments, we characterized the rhizobiomes of Deyeuxia curvula and Werneria incisa across the Salar de Huasco (SH) in the Chilean Altiplano (~ 3800 masl), a polyextreme ecosystem characterized by high UV radiation, salinity gradients, water scarcity, and high metal concentrations. Our objectives were to identify microbial taxa associated with plant adaptation and to infer functional traits linked to survival under these conditions.