Quorum sensing activity of the plant growth-promoting rhizobacterium <Emphasis Type="Italic">Serratia glossinae</Emphasis> GS2 isolated from the sesame (<Emphasis Type="Italic">Sesamum indicum</Emphasis> L.) rhizosphere |
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Authors: | Byung Kwon Jung Abdur Rahim Khan Sung-Jun Hong Gun-Seok Park Yeong-Jun Park Ho-Jin Kim Hwang-Ju Jeon Muhammad Aaqil Khan Muhammad Waqas In-Jung Lee Sung-Eun Lee Jae-Ho Shin |
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Institution: | 1.School of Applied Biosciences, College of Agriculture and Life Sciences,Kyungpook National University,Daegu,Republic of Korea;2.Department of Plant and Microbial Biology,University of California,Berkeley,USA;3.Department of Biomedical Engineering,The University of Texas at Austin,Austin,USA;4.National Agricultural Products Quality Management Service,Gyeongsangbuk-do,Republic of Korea;5.Department of Agriculture,Abdul Wali Khan University Mardan,Mardan,Pakistan |
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Abstract: | Plant growth-promoting rhizobacteria (PGPR) affect plant growth through various mechanisms, such as indole-3-acetic acid (IAA) production, 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity, and biofilm formation. The aim of the study reported here was to isolate and characterize rhizobacteria that produce quorum-sensing signal molecules and other PGPR-related molecules. A biofilm-forming bacterium, GS2, was isolated from the rhizosphere of a sesame plant and subsequently found to produce two quorum-sensing signal molecules that were identified as N-hexanoyl-L-homoserine lactone (m/z 200) and N-octanoyl-L-homoserine lactone (m/z 228) by liquid chromatography–tandem mass spectrometry analysis. The strain was also found to produce IAA (17.2 μg mL?1), gibberellins (113.7 μg mL?1), and ACC deaminase (9.7 μM α-ketobutyrate mg?1 protein h?1). The strain was identified as Serratia glossinae based on a comparison of 16S rRNA gene sequences. Inoculation of the strain promoted growth of a gibberellin-deficient rice dwarf mutant (Waito-C). Different growth attributes, including shoot and root elongation, chlorophyll content, and plant weight could be attributed to the PGPR characteristics of strain GS2. These results suggest that S. glossinae strain GS2 can serve as a microbial agent that improves plant growth. |
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