Abstract
Marine bacteria possess a wide variety of bioremediation potential which is beneficial environmentally and economically. In this study, bacterial isolates from marine waters were screened for tolerance and growth in high concentrations of chromate (Cr6+). Two isolates, capable of tolerating Cr6+ concentrations 300 µg mL−1 or higher, and found to completely reduce 20 µg mL−1 Cr6+ were grown in Cr6+ (50 and 100 mg kg−1) spiked garden soil. Notably, both facilitated normal germination and growth of mung (Vigna radiata) seeds, which could hardly germinate in Cr6+ spiked garden soil without either of these bacteria. In fact, large percent of mung seeds failed to sprout in the Cr6+ spiked garden soil and could not grow any further. Apparently, chromate detoxification by marine bacterial isolates and the ability of mung plants to deal with the reduced form appear to work complementarily. This study provides an insight into marine bacterial abilities with respect to chromium and potential applications in promoting growth of leguminous plants-similar to mung in particular-in Cr6+ contaminated soil.




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Acknowledgements
We thank the Director, NIO for the facilities and encouragement. Elroy Joe Pereira was provided research fellowship by the University Grant Commission (UGC) (Sanction letter No: 18-12/2011(ii) EU-V); and this study is funded by Project No: PSC0206 (MARBIOTECH). This is NIO’s contribution No. 6081.
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Table 1
The complete list of primers used in this study to target Cr6+ resistance and reduction related genes
Fig. 1
Growth (OD600) of NIOMR 3 in NB with (100 µg mL−1) and without Cr6+
Fig. 2
Growth (OD600) of NIOMR 8 in NB with (100 µg mL−1) and without Cr6+
Fig. 6
Cr6+ reduction by NIOMR 3 and NIOMR 8, respectively at three levels of chromate (20, 50 and 100 µg mL−1 Cr6+). Reduction was monitored for 10 days of growth incubation
Fig. 3
Growth (OD600) responses of NIOMR 3 and NIOMR 8 in Cr6+ supplemented (100 µg mL−1) and Cr6+ free NB at different temperatures (20–42 °C)
Fig. 4
Growth (OD600) responses of NIOMR 3 and NIOMR 8 in Cr6+ supplemented (100 µg mL−1) and Cr6+ free NB at different growth pHs (4–10)
Fig. 5
Cr6+ reduction by NIOMR 3 and NIOMR 8, respectively at three levels of chromate (20, 50 and 100 µg mL−1 Cr6+). Reduction was monitored for 10 days of growth incubation
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Pereira, E.J., Fonseca, S., Meena, R.M. et al. Improved Sprouting and Growth of Mung Plants in Chromate Contaminated Soils Treated with Marine Strains of Staphylococcus Species. Indian J Microbiol 57, 400–408 (2017). https://doi.org/10.1007/s12088-017-0668-y
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DOI: https://doi.org/10.1007/s12088-017-0668-y

