ORIGINAL RESEARCH
Culture-Dependent Analysis of 16S rRNA
Sequences Associated with the Rhizosphere
of Lemna minor and Assessment of Bacterial
Phenol-Resistance: Plant/Bacteria System
for Potential Bioremediation – Part II
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1
Institute for Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, Belgrade
2
Institute for Biological Research “Siniša Stanković”, University of Belgrade, Despota Stefana 142 Street, Belgrade, Serbia
3
Faculty of Biology, University of Belgrade, Studentski Trg 16, Belgrade, Serbia
4
Mining and Metallurgy Institute, Zeleni Bulevar 35, 19219 Bor, Serbia
Submission date: 2017-11-27
Final revision date: 2017-12-26
Acceptance date: 2018-01-02
Online publication date: 2018-10-08
Publication date: 2018-12-20
Corresponding author
Olga Radulovic
Institute for Chemistry and Metallurgy, University of Belgrade, Njegoševa 12, Belgrade, Njegoseva 12, 11000 Belgrade, Serbia
Pol. J. Environ. Stud. 2019;28(2):811-822
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ABSTRACT
In this work, we demonstrate that the rhizosphere of common duckweed (Lemna minor)
is inhabited with various phenol-resistant bacterial strains. Based on 16S rRNA sequencing, we have
identified 60 rhizosphere-associated bacterial isolates belonging to 10 different bacterial genera
(Pseudomonas, Hafnia, Serratia, Enterobacter, Micrococcus, Stenotrophomonas, Xanthomonas, Bacillus,
Staphylococcus and Klebsiella). All isolates have been tested for phenol resistance and ability to utilize
phenol as the sole carbon source. 70% of all isolates survived high doses of phenol (≥200 mg/L) and at
least 27% can be potentially acclimatized by gradual increase of phenol concentration. Finally, based
on high phenol resistance, ability to utilize phenol as the sole carbon source and documented low
pathogenicity, we propose 5 strains as potentially excellent candidates for bioremediation. These 5
strains taxonomically correspond to Klebsiella sp., Serratia sp., and Hafnia sp., respectively. To the best
of our knowledge, this is the first attempt to assess decontamination capacity of Serratia nematodiphila
and Hafnia sp. in the context of bioremediation of phenol-contaminated aqueous media. Although
additional analyses are needed, interaction between the common duckweed and the selected bacterial
strains may be utilized in future bioremediation strategies.