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http://dx.doi.org/10.7845/kjm.2017.7066

Isolation of copper-resistant bacteria with plant growth promoting capability  

Kim, Min-Ju (Department of Biological Sciences, Kangwon National University)
Song, Hong-Gyu (Department of Biological Sciences, Kangwon National University)
Publication Information
Korean Journal of Microbiology / v.53, no.4, 2017 , pp. 251-256 More about this Journal
Abstract
Some rhizobacteria were isolated, that have copper resistance and can confer copper resistance to plants allowing growth under copper stress. Isolated strains Pseudomonas veronii MS1 and P. migulae MS2 produced 0.13 and 0.26 mmol/ml of siderophore, that is a metal-chelating agent, and also showed 64.6 and 77.9% of biosorption ability for Cu in 20 mg/L Cu solution, respectively. Copper can catalyze a formation of harmful free radicals, which may cause oxidative stress in organisms. Removal activity of 1,1-diphenyl-2-picryl hydrazyl radical and antioxidant capacity of strains MS1 and MS2 increased up to 82.6 and 78.1%, respectively compared to those of control at 24 h of incubation. They exhibited 7.10 and $6.42{\mu}mol$ ${\alpha}$-ketobutyrate mg/h of 1-aminocyclopropane-1-carboxylic acid deaminase activity, respectively, which reduced levels of stress hormone, ethylene in plants, and also produced indole-3-acetic acid and salicyclic acid that can help plant growth under abiotic stress. All these results indicated that these copper-resistant rhizobacteria could confer copper resistance and growth promotion to plants.
Keywords
ACC deaminase; antioxidant capacity; Cu-resistant bacteria; plant growth promotion; siderophore;
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