, an Endophyte Fungus from the Metal Hyperaccumulator Plant , Promotes Its Growth and Increases Metal Translocation.

Heavy metal pollution is a worldwide environmental and human health problem. is a hyperaccumulator legume that bioaccumulates Pb, Cu and Zn. With interest in designing phytoremediation strategies for sites contaminated with heavy metals, we isolated and characterized endophytic fungi from the roots of growing on mine tailings located in Morelos, Mexico. Ten endophytic isolates were selected by morphological discrimination and a preliminary minimum inhibitory concentration was determined for zinc, lead and copper. A novel strain of closest to was determined to be a metallophile and presented a marked tolerance to high concentrations of Cu, Zn and Pb, so it was further investigated for removal of metals and promotion of plant growth under greenhouse conditions. The control substrate with fungi promoted larger size characters in individuals in comparison with the other treatments, demonstrating that strain C7 is a growth-promoting agent for individuals. The fungus favors the translocation of metals from roots to leaves in , promoting an increased Cu translocation. This new strain showed endophytic character and plant growth-promotion activity, high metal tolerance, and an ability to increase copper translocation. We propose it as a novel, effective and sustainable bioremediation strategy for copper-polluted soils.