Rhizospheric effects of alfalfa on biotransformation of polychlorinated biphenyls in a contaminated soil augmented with Sinorhizobium meliloti

Influence of Rhizobium meliloti on phytoremediation of polycyclic aromatic hydrocarbons by alfalfa in an aged contaminated soil

“…It therefore follows that enhancement of plant metabolic activities by inoculation with rhizobia may lead to stimulation of the growth of PAH-degrading bacteria. Some studies have indicated that rhizobia, either as free living cells or in symbiosis with host plants, have the ability to transform PCBs and PAHs [12,14,16,25]. In the present study, inoculation with Rhizobium significantly enhanced depletion of 3-and 4-ring PAHs in the soil.…”

“…Alfalfa (Medicago sativa L.), the most widely grown perennial legume in the world, is a deep-rooted perennial species that may have strong potential for the remediation of a number of organic contaminants [21][22][23][24]. Studies have therefore begun on the potential of the alfalfa-Rhizobium symbiosis to remediate soils contaminated with persistent organic pollutants such as polychlorinated biphenyls (PCBs) and petroleum hydrocarbon compounds (PHC) [21,25,26]. However, little is known about the effects of Rhizobium on phytoremediation by alfalfa of aged PAH-contaminated soils.…”

Rhizosphere processes and management in plant-assisted bioremediation (phytoremediation) of soils

“…Six (Dams et al 2007;Singer et al 2003;Van Dillewijn et al 2007;Johnson et al 2004;Mehmannavaz et al 2002;Child et al 2007) out of the twenty three studies compared the effect of plant inoculation on pollutant degradation. In four studies, biodegradation in the presence of inoculate was slightly (Singer et al 2003) to substantially (Dams et al 2007;Johnson et al 2004;Child et al 2007) enhanced.…”

“…In four studies, biodegradation in the presence of inoculate was slightly (Singer et al 2003) to substantially (Dams et al 2007;Johnson et al 2004;Child et al 2007) enhanced. However, microbial inoculation inhibited rhizodegradation relative to the noninoculated control in two studies (van Dillewijn et al 2007;Mehmannavaz et al 2002). Interestingly, microbial treatments appeared to be successful at the bench and pot experiment scale (Dams et al 2007;Singer et al 2003;Johnson et al 2004;Child et al 2007) but failed when applied to long-term contaminated soil on field experiments (Van Dilleweijn et al 2007;Siciliano et al 2003).…”

Evaluation of the Eological Management and Enhancement Alernative for Remediation of the K1007-P1 Pond

“…However, the technical basis for accomplishing this has not yet been well established. The results of studies relevant to this possibility have been published in the peer-reviewed literature by Mehmannavaz et al (2002), Campanella et al (2002), Ryslava et al (2003), Sung et al (2003) and Chekol et al (2004).…”