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KMID : 0364820100460020157
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Korean Journal of Microbiology
2010 Volume.46 No. 2 p.157 ~ p.161
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Plant Growth Promotion by Purple Nonsulfur Rhodopseudomonas faecalis Strains
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Lee Eun-Seon
Song Hong-Gyu
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Abstract
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Photosynthetic purple nonsulfur bacterial strains were isolated from the sediments collected from rice paddy fields and sludges of wastewater treatment plant, and their plant growth promoting capabilities were examined. Most well known phytohormones, auxin such as indole-3-acetic acid (IAA) and indole-3-butyric acid (IBA) and 5’-aminolevulinic acid (ALA) were detected by HPLC in the culture broth of these isolates. Among the isolated bacteria, Rhodopseudomonas faecalis D15 showed the highest production rate of 769.8 μg/mg protein of IAA, 1323 μg/mg protein of IBA and 7.4 mM/mg
protein of ALA in the modified Biebl and Pfennig’s medium. R. faecalis C9 showed the highest production rate of 20.82 μg/mg protein of gibberellin. In consequence, the root length and dry weight of the germinated tomato seedling treated with R. faecalis isolates were longer and heavier than those of uninoculated control after 15 days of incubation in the soil. Especially, the dry weight of germinated tomato seedling increased by 119.4% in C9-treated samples after 15 days. These purple nonsulfur bacteria may be utilized as environment-friendly biofertilizer in the agriculture.
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KEYWORD
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ALA, gibberellin, IAA, plant growth promotion, R. faecalis
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