“…PGPR with ACC deaminase were isolated from rhizosphere of various plants (Belimov et al, 2001). What's more, some rhizobacteria can promote plant growth by the synthesis of other compounds, such as siderophores, indole-3-acetic acid (IAA) and antibiotics with heavy metal contaminants, which is different from organic pollutants (Burd et al, 2000;Glick, 2001;Pattern and Glick, 1996) or though stimulation of certain metabolic pathways such as nitrogen fixation and the uptake of nitrogen, phosphorus, S, Mg, Ca and other nutrients (Bashan and Levanony, 1990;Belimov and Dietz, 2000;Okon and Labandera-Gonzalez, (2003) 1994). Leong (1986) reported that heavy metals in soils could stimulate the production of siderophores.…”