Effective rhizoinoculation and biofilm formation by arsenic immobilizing halophilic plant growth promoting bacteria (PGPB) isolated from mangrove rhizosphere: A step towards arsenic rhizoremediation
| Autor: | Ujjal Kumar Mukhopadhyay, Ivy Mallick, Shayantan Mukherji, Chandrima Bhattacharyya, Dhritiman Dey, Somesh Chandra Sarkar, Abhrajyoti Ghosh |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Environmental Engineering Environmental remediation Microbial Consortia chemistry.chemical_element India 010501 environmental sciences Biology Rhizobacteria 01 natural sciences Arsenic 03 medical and health sciences chemistry.chemical_compound Bioremediation Botany Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences Arsenite Rhizosphere Bacteria Biofilm Salt-Tolerant Plants biology.organism_classification Pollution 030104 developmental biology Biodegradation Environmental chemistry Biofilms Wetlands Water Pollutants Chemical |
| Zdroj: | The Science of the total environment. |
| ISSN: | 1879-1026 |
| Popis: | Arsenic (As) uptake by plants is largely influenced by the presence of microbial consortia and their interactions with As. In the coastal region of Bengal deltaic plain of Eastern India, the As-contaminated groundwater is frequently used for irrigation purposes resulting in an elevated level of soil As in agricultural lands. The health hazards associated with As necessitates development of cost-effective remediation strategies to reclaim contaminated agricultural lands. Among the available technologies developed in recent times, bioremediation using bacteria has been found to be the most propitious. In this study, two As-resistant halophilic bacterial strains Kocuria flava AB402 and Bacillus vietnamensis AB403 were isolated, identified and characterized from mangrove rhizosphere of Sundarban. The isolates, AB402 and AB403, could tolerate 35 mM and 20 mM of arsenite, respectively. The effect of As on the exopolysaccharide (EPS) synthesis, biofilm formation, and root association was evaluated for both the bacterial strains. Arsenic adsorption on the cell surfaces and intracellular accumulation in both the bacterial strains were promising under culture conditions. Moreover, both the strains when used as inoculum, not only promoted the growth of rice seedlings but also decreased As uptake and accumulation in plants. |
| Databáze: | OpenAIRE |
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