Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5743575 | Ecological Engineering | 2017 | 6 Pages |
â¢Pantoea ananatis, Rahnella aquatilis and Enterobacter sp. could release K from mica.â¢This is first report about R. aquatilisas an effective KSB.â¢All these KSBs improved the growth of rice in both pot and field experiments, when compared to the control.â¢These KSBs can be used as effective biofertilizer for eco-friendly rice production systems and also can be worthy of commercial development.
The objective of this study was to investigate the ability of three phosphate-solubilizing bacteria (PSB), including Pantoea ananatis (KM977993), Rahnella aquatilis (KM977991) and Enterobacter sp. (KM977992), to release potassium (K) from mica and also to evaluate their effect in promoting the growth of rice (cv. 'Tarom Hashemi') plants at an early stage of development. These isolates significantly solubilized K from mica in both solid and liquid medium in vitro. After 25 days of growth in liquid AM medium, K-solubilization (KS) for P. ananatis, Enterobacter sp. and R. aqautillis was 38.9, 33.6 and 15.5 μg mlâ1, respectively. KS of the isolates increased as pH of the culture medium declined (r = â0.83, P < 0.0053), as a result of organic acid production. Single KSB inoculations increased plant height (PlHe), stem diameter (SD), root length (RL), leaf area (LA) and biomass dry weight (BDW) by 4.09-10.8%, 4.07-10.4%, 8.0-13.1%, 19.8-21.4% and 7.53-15.7%, respectively, in a pot experiment while PlHe, BDW, SPAD value, K uptake in the leaves, stem, and root of rice seedling also increased by 10.8-15.1%, 27.4-65.3%, 8.64-12.0%, 38.5-76.9%, 17.6-52.9% and 25.0-75.0%, respectively, in a field experiment, when compared to the control. The results of both experiments indicate that the values of all measured parameters were higher when rice seedlings were inoculated with P. ananatis than withEnterobacter sp. and R.aquatilis. Based on our results, these isolates can be used as both PSB and KSB to enhance rice growth and also can be worthy of commercial development.
Graphical abstractSchematics representation of the interaction between potassium-solubilizing bacteria (KSB) or phosphate-solubilizing bacteria (PSB) and plant root to release potassium (K) and phosphorus (P) in forms that can be absorbed by plant. Download high-res image (151KB)Download full-size image