Production of Indole-3-Acetic Acid in the Plant-Beneficial Strain Pseudomonas chlororaphis O6 Is Negatively Regulated by the Global Sensor Kinase GacS |
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Authors: | Beom Ryong Kang Kwang Yeol Yang Baik Ho Cho Tae Ho Han In Seon Kim Myung Chul Lee Anne J Anderson Young Cheol Kim |
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Institution: | (1) Agricultural Plant Stress Research Center and Biotechnology Research Institute, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, 500-757, Korea;(2) National Institute of Agricultural Biotechnology, RDA, Suwon, 441-707, Korea;(3) Department of Biology, Utah State University, Logan, UT, 84322-5305, United States |
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Abstract: | Certain plant growth–promoting bacteria, such as Pseudomonas fluorescens 89B61 and Bacillus pumilus SE34, secreted high levels of indole-3-acetic acid (IAA) in tryptophan-amended medium in stationary phase as determined by
chromogenic analysis and high-performance liquid chromatography. Two other growth-promoting strains, P. chlororaphis O6 and Serratia marcescens 90-166, did not produce these high levels of IAA. However, when the gacS mutant of P. chlororaphis O6 was grown in tryptophan-supplemented medium, IAA was detected in culture filtrates. IAA production by the gacS mutant in P. chlororaphis O6 was repressed in the tryptophan medium by complementation with the wild-type gacS gene. Thus, the global regulatory Gac system in P. chlororaphis O6 acts as a negative regulator of IAA production from trypophan. |
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