Potassium-Solubilizing Activity of Bacillus aryabhattai SK1-7 and Its Growth-Promoting Effect on Populus alba L.
Open Access
- 16 December 2020
- Vol. 11 (12), 1348
- https://doi.org/10.3390/f11121348
Abstract
In the present study, the potassium-solubilizing characteristics of Bacillus aryabhattai SK1-7 and its growth-promoting effect on plants were evaluated to determine the biotechnological potential of this bacterium in alleviating soil potassium deficiency. The potassium-solubilizing activity of SK1-7 was determined by fermentation. Additionally, the fermentation broth was determined by flame spectrophotometry. The aluminum and silicon ion contents in SK1-7 fermentation broth were determined by inductively coupled plasma-atomic emission spectroscopy (ICP-AES) after digestion with nitric acid hydrogen peroxide hydrofluoric acid. Scanning electron microscopy (SEM)-based observations were performed to assess the morphological changes in potassium feldspar surfaces digested by potassium-solubilizing bacteria. In addition, the effects of SK1-7 on plant growth and soil physical and chemical properties were analyzed. After incubation for 7 days in a potassium-solubilizing medium, the concentration of potassium dissolved reached 10.8 μg/mL and the percentage of potassium released was 32.6%. The pH rapidly decreased from 7.2 to 4.321 within the first day and then further decreased to 3.90 after 7 days. After 7 days, the concentrations of aluminum and silicon in the fermentation broth were 1.01 and 24.19 μg/mL, respectively. The growth promotion assay results showed that SK1-7 has good growth-promoting effects on poplar and can effectively improve the available potassium content in poplar rhizosphere soil. The SK1-7 strain can effectively dissolve insoluble potassium to release soluble potassium ions and clearly promotes the growth of poplar after being applied to soil. Thus, the SK1-7 strain is a potassium-solubilizing microorganism with good application prospects.Keywords
This publication has 12 references indexed in Scilit:
- Phosphate and potassium-solubilizing bacteria effect on the growth of riceEcological Engineering, 2017
- Identification and characterization of potassium solubilizing bacteria (KSB) from Indo-Gangetic Plains of IndiaBiocatalysis and Agricultural Biotechnology, 2016
- Biotite weathering by Aspergillus niger and its potential utilisationJournal of Soils and Sediments, 2016
- A thermosensitive hydrogel carrier for nickel nanoparticlesColloids and Interface Science Communications, 2015
- Isolation and identification of potassium-solubilizing bacteria from tobacco rhizospheric soil and their effect on tobacco plantsApplied Soil Ecology, 2014
- The Critical Role of Potassium in Plant Stress ResponseInternational Journal of Molecular Sciences, 2013
- Microbial biomass, nutrient availability and nutrient uptake by wheat in two soils with organic amendmentsJournal of Soil Science and Plant Nutrition, 2013
- Isolation and characterization of mineral phosphate-solubilizing bacteria naturally colonizing a limonitic crust in the south-eastern Venezuelan regionSoil Biology and Biochemistry, 2007
- Nutrient Sensing and Signaling: NPKSAnnual Review of Plant Biology, 2007
- A HYPOTHESIS RELATING CRITICAL POTASSIUM CONCENTRATIONS FOR GROWTH TO THE DISTRIBUTION AND FUNCTIONS OF THIS ION IN THE PLANT CELLNew Phytologist, 1984