Showing papers on "Phosphate solubilizing bacteria published in 2002"

Variations in hetetrophic and phosphate solubilizing bacteria from Chennai, southeast coast of India

Abstract: Estuarine and open coastal biotopes along the Chennai coast were sampled bimonthly for total heterotrophic as well as phosphate solubilizing bacteria (PSB) between January and December 1999. THB was high during months January, September and November. THB population ranged from 6.03 - 8.13 x 10 5 cells ml -1 and phosphate solubilizing bacterial population from 1.00-1.3 x 10 3 cells ml -1 . Pseudomonas and Bacillus were found to solubilize more phosphates than others. Further the phosphate solubilizing potential of Pseudomonas was confirmed in broth cultures where P solubilization was 1700 μg/ml -1 associated with reduction of pH.

Host specificity of phosphate solubilizing bacteria

Abstract: A total of 73 isolates of P- solubilizing bacteria were isolated from the rhizosphere of cowpea, maize, sorghum, cotton and pearl millet. Eleven promising isolates were selected based on their rate of P-solubilization forsubsequent studies. Sorghum and pearl millet showed more PSB followed by maize, cowpea and cotton. The isolates showed variable halo zone on medium containing tricalcium phosphate. A decrease in pH of medium was noticed in almost all the isolates with differences between the isolates. The rate of phosphate solubilization was much faster on tricalcium phosphate than Mussoorie rock phosphate. The isolate No. 8, 14, 23 and 30 were identified as Bacillus species, whereas, the isolate No. 43 was Gram variable with small rods. All these isolates showed inoculation response on their respective crops in terms of PSB count and plant biomass under pot culture conditions.

Efficacy of a Rock Phosphate Based Soil Implant Formulation of Phosphobacteria in Soybean (Glycine max Men-ill)

Abstract: For improving the effectiveness of low-grade rock phosphate, a granular formulation was developed by immo­ bilizing phosphate solubilizing bacteria (PSB) impregnated rock phosphate in calcium alginate. This process ensured requisite standards of PSB viability in rock phosphate. The formulation was compared with powdered soil and seed formulations 1'01' its efficacy in soybean; maximum weight of nodule, dry matter and grain yield, Nand P uptake of shoot and grain were recorded with granular preparation. The granular formulation can directly be applied in soil and is environmentally safe.

Utilization of Sparingly Soluble Phosphate by Red Cloverin Association with Glomus mosseae andBacillus megaterium

Abstract: A pot experiment was conducted to investigate the mobilization of sparingly soluble inorganic andorganic sources of phosphorus (P) by red clover (Trghlium pmtense L.) whose roots were colonized by thearbuscular mycorrhizal (AM) fungus Glomus mosseae and in association with the phosphate-solubilizing(PS) bacterium Bacillus megaterium ACCC10010. Phosphate-solubilizing bacteria and rock phosphate hada synergistic effect on the colonization of plant roots by the AM fungus. There was a positive interactionbetween the PS bacterium and the AM fungus in mobilization of rock phosphate, leading to improved plantP nutrition. In dual inoculation with the AM fungus and the PS bacterium, the main contribution to plantP nutrition was made by the AM fungus. Application of P to the low P soil increased phosphatase activityin the rhizosphere. Alkaline phosphatase activity was significantly promoted by inoculation with either thePS bacterium or the AM fungus.