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Metal tolerant and antibiotic resistant bacteria from the rhizosphere of water hyacinth: a study from a wetland receiving non point source of contamination

Author Affiliations

  • 1School of Environmental Sciences, Mahatma Gandhi University, Kottayam, Kerala 686560, India
  • 2School of Environmental Sciences, Mahatma Gandhi University, Kottayam, Kerala 686560, India
  • 3School of Environmental Sciences, Mahatma Gandhi University, Kottayam, Kerala 686560, India

Int. Res. J. Environment Sci., Volume 7, Issue (6), Pages 34-45, June,22 (2018)


Heavy metals and antibiotics are considered as the emerging environmental pollutants causing both long-term and short-term modifications in the natural microbial communities due to their toxicity. The present study focus on the metal tolerance and antibiotic resistance pattern of bacteria isolated from the rhizosphere of water hyacinth growing in a tropical wetland ecosystem. The water quality analysis, profiling of bacteria from the water hyacinth rhizosphere, bacterial load of water and sediment, and metal tolerance of rhizosphere bacteria against Cu, Zn, Pb and Cd were tested. The antibiotic resistance experiments were also carried out on the rhizosphere bacteria samples with 13 different antibiotics. Results showed that microbial load in rhizosphere were 67x103 CFU/ml and the same of associated water and sediment system were 2.21x102 CFU/ml and 2.56x103 CFU/ml respectively. Five different bacterial genera were identified from the rhizosphere of water hyacinth which belongs to Chromobacterium, Bacillus, Listeria, Pseudomonas and Vibrio. The pattern of heavy metal tolerance observed by isolated strains as follows: Chromobacterium-Pb>Zn&


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