scholarly journals Application of Potential Phosphate-Solubilizing Bacteria and Organic Acids on Phosphate Solubilization from Phosphate Rock in Aerobic Rice

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Qurban Ali Panhwar ◽  
Shamshuddin Jusop ◽  
Umme Aminun Naher ◽  
Radziah Othman ◽  
Mohd Ismail Razi
Keyword(s):  
Oxalic Acid ◽  
Organic Acids ◽  
Soil Ph ◽  
Phosphate Rock ◽  
Plant Biomass ◽  
P Uptake ◽  
Aerobic Rice ◽  
Phosphate Solubilizing Bacteria ◽  
P Solubilization ◽  
Phosphate Solubilizing

A study was conducted at Universiti Putra Malaysia to determine the effect of phosphate-solubilizing bacteria (PSB) and organic acids (oxalic & malic) on phosphate (P) solubilization from phosphate rock (PR) and growth of aerobic rice. Four rates of each organic acid (0, 10, 20, and 30 mM), and PSB strain (Bacillussp.) were applied to aerobic rice. Total bacterial populations, amount of P solubilization, P uptake, soil pH, and root morphology were determined. The results of the study showed significantly high P solubilization in PSB with organic acid treatments. Among the two organic acids, oxalic acid was found more effective compared to malic acid. Application of oxalic acid at 20 mM along with PSB16 significantly increased soluble soil P (28.39 mg kg−1), plant P uptake (0.78 P pot−1), and plant biomass (33.26 mg). Addition of organic acids with PSB and PR had no influence on soil pH during the planting period. A higher bacterial population was found in rhizosphere (8.78 log10 cfu g−1) compared to the nonrhizosphere and endosphere regions. The application of organic acids along with PSB enhanced soluble P in the soil solution, improved root growth, and increased plant biomass of aerobic rice seedlings without affecting soil pH.

scholarly journals Responses to soil pH gradients of inorganic phosphate solubilizing bacteria community

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Bang-Xiao Zheng ◽  
Ding-Peng Zhang ◽  
Yu Wang ◽  
Xiu-Li Hao ◽  
Mohammed A. M. Wadaan ◽  
...  
Keyword(s):  
Soil Ph ◽  
Inorganic Phosphate ◽  
Phosphate Solubilizing Bacteria ◽  
Ph Gradients ◽  
Phosphate Solubilizing

Improving cadmium mobilization by phosphate-solubilizing bacteria via regulating organic acids metabolism with potassium

Chemosphere ◽  
2020 ◽  
Vol 244 ◽  
pp. 125475 ◽  
Author(s):  
Wan-Li Li ◽  
Jun-Feng Wang ◽  
Yao Lv ◽  
Hao-Jie Dong ◽  
Li-Li Wang ◽  
...  
Keyword(s):  
Organic Acids ◽  
Phosphate Solubilizing Bacteria ◽  
Phosphate Solubilizing

scholarly journals Differential Root Exudation and Architecture for Improved Growth of Wheat Mediated by Phosphate Solubilizing Bacteria

2021 ◽  
Vol 12 ◽  
Author(s):  
Mahreen Yahya ◽  
Ejaz ul Islam ◽  
Maria Rasul ◽  
Iqra Farooq ◽  
Naima Mahreen ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Organic Acids ◽  
Root Exudation ◽  
Principal Component ◽  
Phosphate Solubilizing Bacteria ◽  
Root Tips ◽  
Wheat Varieties ◽  
P Deficiency ◽  
Phosphate Solubilizing

Phosphorous (P) deficiency is a major challenge faced by global agriculture. Phosphate-solubilizing bacteria (PSB) provide a sustainable approach to supply available phosphates to plants with improved crop productivity through synergistic interaction with plant roots. The present study demonstrates an insight into this synergistic P-solubilizing mechanism of PSB isolated from rhizosphere soils of major wheat-growing agro-ecological zones of Pakistan. Seven isolates were the efficient P solubilizers based on in vitro P-solubilizing activity (233-365 μg ml–1) with a concomitant decrease in pH (up to 3.5) by the production of organic acids, predominantly acetic acid (∼182 μg ml–1) and gluconic acid (∼117 μg ml–1). Amplification and phylogenetic analysis of gcd, pqqE, and phy genes of Enterobacter sp. ZW32, Ochrobactrum sp. SSR, and Pantoea sp. S1 showed the potential of these PSB to release orthophosphate from recalcitrant forms of phosphorus. Principal component analysis indicates the inoculation response of PSB consortia on the differential composition of root exudation (amino acids, sugars, and organic acids) with subsequently modified root architecture of three wheat varieties grown hydroponically. Rhizoscanning showed a significant increase in root parameters, i.e., root tips, diameter, and surface area of PSB-inoculated plants as compared to uninoculated controls. Efficiency of PSB consortia was validated by significant increase in plant P and oxidative stress management under P-deficient conditions. Reactive oxygen species (ROS)-induced oxidative damages mainly indicated by elevated levels of malondialdehyde (MDA) and H2O2 contents were significantly reduced in inoculated plants by the production of antioxidant enzymes, i.e., superoxide dismutase, catalase, and peroxidase. Furthermore, the inoculation response of these PSB on respective wheat varieties grown in native soils under greenhouse conditions was positively correlated with improved plant growth and soil P contents. Additionally, grain yield (8%) and seed P (14%) were significantly increased in inoculated wheat plants with 20% reduced application of diammonium phosphate (DAP) fertilizer under net house conditions. Thus, PSB capable of such synergistic strategies can confer P biofortification in wheat by modulating root morphophysiology and root exudation and can alleviate oxidative stress under P deficit conditions.

scholarly journals Inorganic Phosphate Solubilization by Rhizosphere Bacterium Paenibacillus sonchi: Gene Expression and Physiological Functions

2020 ◽  
Vol 11 ◽  
Author(s):  
Luciana F. Brito ◽  
Marina Gil López ◽  
Lucas Straube ◽  
Luciane M. P. Passaglia ◽  
Volker F. Wendisch
Keyword(s):  
Gene Expression ◽  
Organic Acids ◽  
Phosphate Solubilization ◽  
Tricarboxylic Acid Cycle ◽  
Initial Step ◽  
High Rate ◽  
Soluble Phosphate ◽  
Phosphate Solubilizing Bacteria ◽  
Phosphate Solubilizing ◽  
Phosphate Source

Due to the importance of phosphorus (P) in agriculture, crop inoculation with phosphate-solubilizing bacteria is a relevant subject of study. Paenibacillus sonchi genomovar Riograndensis SBR5 is a promising candidate for crop inoculation, as it can fix nitrogen and excrete ammonium at a remarkably high rate. However, its trait of phosphate solubilization (PS) has not yet been studied in detail. Here, differential gene expression and functional analyses were performed to characterize PS in this bacterium. SBR5 was cultivated with two distinct P sources: NaH2PO4 as soluble phosphate source (SPi) and hydroxyapatite as insoluble phosphate source (IPi). Total RNA of SBR5 cultivated in those two conditions was isolated and sequenced, and bacterial growth and product formation were monitored. In the IPi medium, the expression of 68 genes was upregulated, whereas 100 genes were downregulated. Among those, genes involved in carbon metabolism, including those coding for subunits of 2-oxoglutarate dehydrogenase, were identified. Quantitation of organic acids showed that the production of tricarboxylic acid cycle-derived organic acids was reduced in IPi condition, whereas acetate and gluconate were overproduced. Increased concentrations of proline, trehalose, and glycine betaine revealed active osmoprotection during growth in IPi. The cultivation with hydroxyapatite also caused the reduction in the motility of SBR5 cells as a response to Pi depletion at the beginning of its growth. SBR5 was able to solubilize hydroxyapatite, which suggests that this organism is a promising phosphate-solubilizing bacterium. Our findings are the initial step in the elucidation of the PS process in P. sonchi SBR5 and will be a valuable groundwork for further studies of this organism as a plant growth-promoting rhizobacterium.

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