alexa Effect of Bacterial Application on Metal Availability a
ISSN: 2155-6199

Journal of Bioremediation & Biodegradation
Open Access

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Research Article

Effect of Bacterial Application on Metal Availability and Plant Growth in Farmland-Contaminated Soils

Du RY, Wen D, Zhao PH, Chen Y and Wang FH*
Public Monitoring Center for Agro-Product, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China and Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality, Ministry of Agriculture, Guangzhou 510640, China
*Corresponding Author : Wang FH
Public Monitoring Center for Agro-Product
Guangdong Academy of Agricultural Sciences
Guangzhou 510640, China
E-mail: [email protected]
Received: January 21, 2016 Accepted: February 05, 2016 Published: March 11, 2016
Citation: Du RY, Wen D, Zhao PH, Chen Y, Wang FH (2016) Effect of Bacterial Application on Metal Availability and Plant Growth in Farmland-Contaminated Soils. J Bioremed Biodeg 7:341. doi: 10.4172/2155-6199.1000341
Copyright: © 2016 Du RY, et al. This is an open-a ccess article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 

Abstract

Conventional approaches for phytoremediation of heavy metal-contaminated soils face challenges in farmland werlands. The combined use of functional microorganisms is a promising option to enhance phytoremediation. Two heavy metal-resistant model strains, designated DBM1 (rhizosphere Arthrobacter) and DBM2 (non-rhizosphere Bacillus), were isolated from polluted farmland soils downstream of a multi-metal mine. The effects of these two bacterial strains on soil metal availability and plant (rice and red ramie) growth were determined under greenhouse conditions. Both microbes (especially DBM2) significantly reduced metal availability and increased pH level in lowcontaminated soil, but the passivation ability of DBM2 disappeared in high-contaminated soil. Soil metal availability was markedly increased by DBM1 after addition of carbon source, while it was reduced by DBM1 or DBM2 with pH increase after addition of nitrogen, phosphorous, or modified fly-ash amendment. Both microbes significantly increased plant biomass and reduced total metal contents of low-metal accumulating rice. For high-metal accumulating red ramie, DBM1 significantly increased plant biomass while DBM2 increased total metal contents. Proper selection of microbial species to match plants for phytoremediation is the key to improve microbe-assisted phytoremediation efficiency in mining-contaminated soils.

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