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Detection and Characterization of ACC Deaminase in Plant Growth Promoting Rhizobacteria

Govindasamy, V., Senthilkumar, M., Mageshwaran, V., Annapurna, K.
Journal of plant biochemistry and biotechnology 2009 v.18 no.1 pp. 71-76
1-aminocyclopropane-1-carboxylate deaminase, cadmium, ethylene, ethylene production, genes, growth promotion, indole acetic acid, nitrogen, nucleic acid hybridization, plant growth, plant growth-promoting rhizobacteria, seedlings, siderophores, solubilization, wheat
The enzyme 1-aminocyclopropane-1-carboxylate deaminase converts ACC, the precursor of the plant hormone ethylene to α-ketobutyrate and ammonium. The enzyme has been identified in few soil bacteria, and is proposed to play a key role in plant growth promotion. In this study, the isolates of plant growth promoting rhizobacteria were screened for ACC deaminase activity based on their ability to grow on ACC as a sole nitrogen source. The selected isolates showed the presence of other plant growth promoting characteristics such as IAA production, phosphate solubilization and siderophore production. The role of ACC deaminase in lowering ethylene production under cadmium stress condition was also studied by measuring in vitro ethylene evolution by wheat seedlings treated with ACC deaminase positive isolates. Nucleic acid hybridization confirmed the presence of ACC deaminase gene (acdS) in the bacterial isolates.