| Title |
Gibberellin-Producing Promicromonospora sp. SE188 Improves Solanum lycopersicum Plant Growth and Influences Endogenous Plant Hormones |
| Author |
Sang-Mo Kang1, Abdul Latif Khan2,3, Muhammad Hamayun4, Javid Hussain2,3, Gil-Jae Joo5, Young-Hyun You6, Jong-Guk Kim6, and In-Jung Lee1* |
| Address |
1School of Applied Biosciences, Kyungpook National University, Daegu 702-701, Republic of Korea, 2Department of Biological Sciences and Chemistry, University of Nizwa, Nizwa, 616, Oman, 3Kohat University of Science and Technology, Kohat, 26000, Kohat Pakistan, 4Department of Botany, Abdul Wali Khan University, Mardan, 23300, Mardan, Pakistan, 5Institute of Agricultural Science and Technology, Kyungpook National University, Daegu 702-701, Republic of Korea, 6School of Life Sciences and Biotechnology, Kyungpook National University, Daegu 702-701, Republic of Korea |
| Bibliography |
Journal of Microbiology, 50(6),902-909, 2012,
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| DOI |
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| Key Words |
gibberellins, plant growth-promotion, Solanum lycopersicum, Promicromonospora sp. SE188 |
| Abstract |
Plant growth-promoting rhizobacteria (PGPR) producing gibberellins (GAs) can be beneficial to plant growth and development. In the present study, we isolated and screened a new strain of Promicromonospora sp., SE188, isolated from soil. Promicromonospora sp. SE188 secreted GAs into its growth medium and exhibited phosphate solubilization potential. The PGPR produced physiologically active (GA1 and GA4) and inactive (GA9, GA12, GA19, GA20, GA24, GA34, and GA53) GAs in various quantities detected by GC/MS-SIM. Solanum lycopersicum (tomato) plants inoculated with Promicromonospora sp. SE188 showed a significantly higher
shoot length and biomass as compared to controls where PGPR-free nutrient broth (NB) and distilled water (DW) were applied to plants. The presence of Promicromonospora sp. SE188 significantly up-regulated the non C-13 hydroxylation
GA biosynthesis pathway (GA12→GA24→GA9→GA4→GA34) in the tomato plants as compared to the NB and DW control plants. Abscisic acid, a plant stress hormone, was significantly down-regulated in the presence of Promicromonospora sp. SE188. Contrarily, salicylic acid was significantly higher in the tomato plant after Promicromonospora sp. SE188 inoculation as compared to the controls. Promicromonospora sp. SE188 showed promising stimulation of tomato plant growth. From the results it appears that Promicromonospora sp. SE188 has potential as a bio-fertilizer and should be more broadly tested in field trials for higher crop production in eco-friendly farming systems. |
