Impact of rhizobacteria on growth and chromium accumulation in Scirpus lacustris L. grown under chromium supplementation.
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Date
2010-09
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Abstract
Four chromate tolerant rhizobacterial strains viz., RZB-01, RZB-02, RZB-03 and RZB-04 were isolated from rhizosphere of
Scirpus lacustris collected from Cr-contaminated area. These strains characterized at morphological and biochemical levels. The most
efficient chromate tolerant strain RZB-03 was inoculated to fresh plant of S. lacustris and grown in 2 μg ml -1 and 5 μg ml -1 of Cr +6
supplemented nutrient solution under controlled laboratory condition. The effects of rhizobacterial inoculation on growth and chromium
accumulation in S. lacustris were evaluated. The inoculation of rhizobacteria increased biomass by 59 and 104%, while total chlorophyll
content by 1.76 and 15.3% and protein content increased by 23 and 138% under 2 μg ml -1 and 5 μg ml -1 concentrations of Cr +6, respectively
after 14 d as compared to non-inoculated plant. Similarly, the Cr accumulation also increased by 97 and 75% in shoot and 114 and 68%
in root of inoculated plants as compared to non inoculated plants at 2 μg ml-1 and 5 μg ml-1 Cr+6 concentrations, respectively, after 14 d.
The chromate tolerant rhizobacteria which play an important role in chromium uptake and growth promotion in plant may be useful in
development of microbes assisted phytoremediation system for decontamination of chromium polluted sites.
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Keywords
Rhizobacterial strains, Hexavalent chromium (Cr +6), Phytoremediation, Tolerance, Tannery sludge, Rhizosphere
Citation
Singh N K, Rai U N, Singh M, Tripathi R D. Impact of rhizobacteria on growth and chromium accumulation in Scirpus lacustris L. grown under chromium supplementation. Journal of Environmental Biology. 2010 Sept; 31(5): 709-714.