Abstract

In Chile, where mining industry left a legacy of abandoned mine tailings in the north and central part of the country, the use of Atriplex species for the phytostabilization of metal enriched soils is a promising method. However, success in plant colonization not only depends on metal tolerance: salinity and drought also constraint plant development. In this study, we compare survival and growth indicators of three native and introduced Atriplex species subjected to copper, salt and water stress. Atriplex nummularia, A. halimus and A. atacamensis seedlings were put through separate treatments of water, copper and salt stress. After seven days, survival and growth parameters of roots and shoots were measured. Results show that all three Atriplex species present significant differences in root length and whole plant biomass under stress treatments. In terms of stressors, it was found that copper significantly higher damage to roots and leaves, while salt causes a significant effect to biomass and growth indicators. This work gives insight into species-specific stress response to abiotic stressors, while giving information for the selection of suitable plant for phytostabilization strategies in challenging ecosystems.