Author(s): Babu AG, Shim J, Bang KS, Shea PJ, Oh BT, Babu AG, Shim J, Bang KS, Shea PJ, Oh BT
Abstract Share this page
Abstract A heavy metal-tolerant fungus, Trichoderma virens PDR-28, was isolated from rhizosphere soil and evaluated for use in remediating mine tailing soil and for plant biomass production. PDR-28 exhibited plant growth-promoting traits, including 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, acid phosphatase and phytase activity, siderophore production, and P solubilization. HMs were more available in mine tailing soil inoculated soil with PDR-28 than in uninoculated soil; the order of HM bioleaching was Cd > As > Zn > Pb > Cu. PDR-28 effectively removed HMs in the order of Pb > Cd > As > Zn > Cu from liquid media containing 100 mg HM L(-1). Inoculating HM-contaminated mine tailing soil with the fungus significantly increased the dry biomass of maize roots (64\%) and shoots (56\%). Chlorophyll, total soluble sugars (reducible and nonreducible), starch, and protein contents increased by 46\%, 28\%, 30\%, and 29\%, respectively, compared to plants grown in uninoculated soil. Inoculation increased heavy metal concentrations in maize roots by 25\% (Cu) to 62\% (Cd) and in shoots by 35\% (Cu) to 64\% (Pb) compared to uninoculated plants. Results suggest that PDR-28 would be beneficial for phytostabilization and plant biomass production as a potential source of biofuel in the quest for renewable energy. Copyright © 2013. Published by Elsevier Ltd.
This article was published in J Environ Manage
and referenced in Journal of Microbial & Biochemical Technology