Evaluation of the PGPR Capacity of Four Bacterial Strains and Their Mixtures, Tested on Lupinus albus var. Dorado Seedlings, for the Bioremediation of Mercury-Polluted Soils

Soil contamination by mercury, which is one of the most toxic heavy metals due to its bioaccumulative capacity, poses a risk environment as well health. The Almadén mining district in Ciudad Real, Spain heavily-polluted sites world, making soils unusable. Bioremediation, and more specifically phyto-rhizoremediation, based on synergistic interaction established between plant Plant Growth Promoting Rhizobacteria (PGPR), improves plant’s ability grow, mobilize, accumulate, extract contaminants from soil. objective this study evaluate growth-promoting four PGPR strains (and mixtures), isolated bulk soil rhizosphere naturally grown plants district, when they are inoculated emerged seeds Lupinus albus, var. Dorado presence high concentrations mercury. After 20 days incubation subsequent harvesting seedlings, biometric measurements were carried out at root aerial levels. results obtained show that treatment with biometry Specifically, strain B2 (Pseudomonas baetica) B1 moraviensis) those contributed growth, both individually part mixtures (CS5 CS3). Thus, these postulated be good candidates for further situ phyto-rhizoremediation tests mercury-contaminated soils.