Arsenite-oxidizing bacteria exhibiting plant growth promoting traits isolated from the rhizosphere of Oryza sativa L.: Implications for mitigation of arsenic contamination in paddies
| Autor: | Jagat Rathod, Suvendu Das, Jiin-Shuh Jean, Mon Lin Chou, Chia Chuan Liu |
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| Rok vydání: | 2016 |
| Předmět: |
Siderophore
Environmental Engineering Arsenites Health Toxicology and Mutagenesis Molecular Sequence Data 0211 other engineering and technologies Bacillus 02 engineering and technology 010501 environmental sciences Oryza Plant Roots 01 natural sciences chemistry.chemical_compound Environmental Chemistry Amino Acid Sequence Waste Management and Disposal 0105 earth and related environmental sciences Arsenite 021110 strategic defence & security studies Rhizosphere Oryza sativa biology food and beverages biology.organism_classification Pollution Kinetics Biodegradation Environmental Agronomy chemistry Genes Bacterial Germination Seedling Shoot Oxidoreductases |
| Zdroj: | Journal of Hazardous Materials. 302:10-18 |
| ISSN: | 0304-3894 |
| Popis: | Arsenite-oxidizing bacteria exhibiting plant growth promoting (PGP) traits can have the advantages of reducing As-uptake by rice and promoting plant growth in As-stressed soil. A gram-positive bacterium Bacillus flexus ASO-6 resistant to high levels of As (32 and 280 mM for arsenite and arsenate, respectively) and exhibiting elevated rates of As(III) oxidation (Vmax=1.34 μM min(-1) 10(-7) cell) was isolated from rhizosphere of rice. The presence of aoxB gene and exhibition of As(III)-oxidase enzyme activity of this strain was observed. The ability of the strain to produce siderophore, IAA, ACC-deaminase and to solubilize phosphate was verified. The rice seed treated with the strain exhibited significantly improved seed germination and seedling vigor compared with the un-inoculated seeds. The bacterial inoculation significantly increased root biomass, straw yield, grain yield, chlorophyll and carotenoid in the rice plant. Moreover, As uptake from root to shoot and As accumulation in straw and grain decreased significantly as a result of the bacterial inoculation. Noteworthy, the inoculation effect is more prominent in non-flooded soil than it is in flooded soil. Owing to its wide action spectrum, this As(III)-oxidizing PGPB could serve as a potential bio-inoculant for mitigation of As in paddies and sustainable rice production in As-contaminated areas. |
| Databáze: | OpenAIRE |
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