Environmental Science and Pollution Research

, Volume 22, Issue 13, pp 9686–9693 | Cite as

Effects of a rhizobacterium on the growth of and chromium remediation by Lemna minor

  • Jie Tang
  • Ying Zhang
  • Yan Cui
  • Jiong Ma
Research Article


Duckweed has shown great potential for both energy and environmental applications, particularly in wastewater treatment and fuel ethanol production. A rhizobacterium, Exiguobacterium sp. MH3, has been reported to associate with the duckweed Lemna minor for symbiotic growth. The aim of this work is to study the effects of rhizobacterium MH3 on L. minor growth and chromium (Cr) remediation. It appeared to have a synergism between the rhizobacterium MH3 and duckweed; the presence of strain MH3 promoted the growth of duckweeds by increasing both the frond number and dry weight of duckweed by more than 30 %, while duckweed in turn provided essential carbon source and energy for the growth of rhizobacterium MH3. Under Cr(VI) exposure, particularly at higher Cr(VI) concentrations, Exiguobacterium sp. MH3 significantly alleviated the harmful effects of the stress on the duckweed by promoting duckweed growth and preventing duckweed from excessive uptake of Cr. Potential mechanisms were also discussed in light of the genome sequence of strain MH3, and it was speculated that siderophores and indole-3-acetic acid (IAA) secreted by strain MH3 might contribute to promoting duckweed growth.


Rhizobacterium Exiguobacterium Duckweed Chromium Growth-promoting effect 



This research was funded by a Key Project of Shenzhen Emerging Industries to JM (No. JC201104210118A) and Public Science and Technology Research Funds Projects of Ocean (201305022). Authors would like to kindly acknowledge Eric Lam for providing Lemna minor 145 and Maurycy Daroch for valuable comments on the manuscript.

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.School of Environment and EnergyPeking University Shenzhen Graduate SchoolShenzhenChina

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