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Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Sep 2010, 31 (5) BackImpact of rhizobacteria
on growth and chromium accumulation in Scirpus lacustris L. grown
under chromium supplementation N.K. Singh1,
U.N. Rai*1, M. Singh2 and R.D.
Tripathi1 1Ecotoxicology and Bioremediation Group, National Botanical
Research Institute, 2Department of Botany, (Received: 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 mg ml-1 and 5 mg 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 mg ml-1 and 5 mg 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 mg ml-1 and 5 mg 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. Key
words: Rhizobacterial strains, Hexavalent chromium (Cr+6),
Phytoremediation, Tolerance, Tannery sludge,? Rhizosphere ??????? PDF of full length paper
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