The contribution of endophytic bacteria to Albizia lebbeck-mediated phytoremediation of tannery effluent contaminated soil.
Toxicity of chromium often impairs the remediation capacity of plants used in phytoremediation of polluted soils. In this study, we have identified Albizia lebbeck as a prospective chromium hyperaccumulator and examined cultivable diversity of endophytes present in chromium-treated and control saplings. High numbers (22-100%) of endophytic bacteria, isolated from root, stem, and leaf tissues, could tolerate elevated (1-3 mM) concentrations of K2CrO7. 16S rRNA gene sequence-based phylogenetic analysis showed that the 118 isolates obtained comprised of 17 operational taxonomic units affiliated with the proteobacterial genera Rhizobium (18%), Marinomonas (1%), Pseudomonas (16%), and Xanthomonas (7%) but also with members of Firmicutes genera, such as Bacillus (35%) and Salinococcus (3%). The novel isolates belonging to Salinococcus and Bacillus could tolerate high K2CrO7 concentrations (3 mM) and also showed elevated activity of chromate reductase. In addition, majority (%) of the endophytic isolates also showed production of indole-3-acetic acid. Taken together, our results indicate that the innate endophytic bacterial community assists plants in reducing heavy metal toxicity.
['Manikandan|Muthu|M|', 'Kannan|Vijayaraghavan|V|', 'Mendoza|Ordetta Hannah|OH|', 'Kanimozhi|Mahalingam|M|', 'Chun|Sechul|S|', 'Pašić|Lejla|L|']
D031289:Albizzia D001419:Bacteria D031723:Bambusa D001673:Biodegradation, Environmental D002857:Chromium D004269:DNA, Bacterial D060026:Endophytes D007887:Fabaceae D007220:Industrial Waste D008969:Molecular Sequence Data D010802:Phylogeny D012336:RNA, Ribosomal, 16S D017422:Sequence Analysis, DNA D012989:Soil Pollutants D013633:Tanning
endophytic bacteria phytoremediation tannery effluent chromate reductase chromium remediation