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Growth Promotion of Tomato Seedlings by Applicaion of Bacillus sp. Isolated from Rhizosphere  

Lee, Kang-Hyeong (Division of Life Sciences, Research Institute of Life Sciences, Kangwon National University)
Song, Hong-Gyu (Division of Life Sciences, Research Institute of Life Sciences, Kangwon National University)
Publication Information
Korean Journal of Microbiology / v.43, no.4, 2007 , pp. 279-284 More about this Journal
Abstract
Two bacterial strains isolated from soil (Bacillus subtilis strains: PS2 and RFO41) were evaluated to determine their promoting effect on the growth of tomato seedling under axonic and pot conditions. The production of phytohormone, such as indole-3-acetic acid, indole-3-butyric acid, gibberellin and zeatin by these two strains was investigated as possible mechanisms for plant growth stimulation. Both PS2 and RFO41 were shown to produce various phytohormones, and. the production of phytohormones was stimulated by the addition of peptone-rich brain heart broth medium. In addition, these bacteria exhibited high levels of phosphatase activity, which ranged from 2.18 to $2.7\;{\mu}\;{\rho}-nitrophenol/ml/hr$. PS2 and RFO41 were applied to the pot test for growth of tomato seed with phosphate. Root and shoot lengths of germinated tomato after 15 days were 45.5% and 36.5% longer than that of control in RFO41 treated samples, respectively. Baciller sp. PS2 and RFO41 may have a potential for biofertilizer in the agriculture.
Keywords
Bacillus sp.; growth promotion; phytohormones; tomato;
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