Authors: SangMo Kang Abdul Latif Khan Muhammad Hamayun Javid Hussain GilJae Joo YoungHyun You JongGuk Kim InJung Lee
Publish Date: 2012/12/30
Volume: 50, Issue: 6, Pages: 902-909
Abstract
Plant growthpromoting 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/MSSIM Solanum lycopersicum tomato plants inoculated with Promicromonospora sp SE188 showed a significantly higher shoot length and biomass as compared to controls where PGPRfree nutrient broth NB and distilled water DW were applied to plants The presence of Promicromonospora sp SE188 significantly upregulated the non C13 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 downregulated 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 biofertilizer and should be more broadly tested in field trials for higher crop production in ecofriendly farming systems
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