Phosphate solubilizing bacteria 1

Phosphate solubilizing bacteria

Phosphate solubilizing bacteria cultured in petridish. The zone of clearance can be clearly seen.

Phosphate solubilizing Bacteria (PSB) are a group of beneficialbacteria capable of hydrolysing organic and inorganic phosphorus frominsoluble compounds.[1] P-solubilization ability of the microorganismsis considered to be one of the most important traits associated withplant phosphate nutrition. It is generally accepted that the mechanismof mineral phosphate solubilization by PSB strains is associated withthe release of low molecular weight organic acids,through which theirhydroxyl and carboxyl groups chelate the cations bound to phosphate,thereby converting it into soluble forms.In addition, some PSB producephosphatase like phytase that hydrolyse organic forms of phosphatecompounds efficiently. One or both types of PSB have been introducedto Agricultural community as phosphate Biofertilizer. Phosphorus (P)is one of the major essential macronutrients for plants and is applied tosoil in the form of phosphate fertilizers. However, a large portion of soluble inorganic phosphate which is applied tothe soil as chemical fertilizer is immobilized rapidly and becomes unavailable to plants.[2] Currently, the mainpurpose in managing soil phosphorus is to optimize crop production and minimize P loss from soils. PSB haveattracted the attention of agriculturists as soil inoculums to improve the plant growth and yield. When PSB used withrock phosphate, it can save about 50% of the crop requirement of phosphatic fertilizer. The use of PSB as inoculantsincreases the P uptake by plants,Simple inoculation of seeds with PSB gives crop yield responses equivalent to 30 kgP2O5 /ha or 50 percent of the need for phosphatic fertilizers. Currently, different strains of these bacteria has beenidentified for using in biofertilizer, of all, three new strains Pantoea agglomerans strain (P5), Microbacteriumlaevaniformans strain (P7) and Pseudomonas putida strain (P13) has been recently identified as the highly efficientinsoluble phosphate solubilizer.

References[1] Y.P. Chen, P.D. Rekha, A.B. Arun, F.T. Shen, W.-A. Lai and C.C. Young (November 2006). "Phosphate solubilizing bacteria from

subtropical soil and their tricalcium phosphate solubilizing abilities" (http:/ / www. sciencedirect. com/ science?_ob=MImg&_imagekey=B6T4B-4JCBN7G-1-7& _cdi=4970& _user=525220& _pii=S0929139306000047& _orig=search& _coverDate=11/ 30/ 2006&_sk=999659998& view=c& wchp=dGLbVlW-zSkzS& md5=0be49d968624c7f54fb43031c2dddcfe& ie=/ sdarticle. pdf). Applied Soil Ecology34 (1): 33–41. . Retrieved 2010-05-29.

[2] "Solubilization of organic and inorganic phosphates by three highly efficient soil bacterial isolates" (http:/ / www. springerlink. com/ content/w21m48v305401288/ ). World Journal of Microbiology and Biotechnology (Springer Netherlands) 25 (8). August 2009. . Retrieved2010-05-29.

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Article Sources and ContributorsPhosphate solubilizing bacteria  Source: http://en.wikipedia.org/w/index.php?oldid=514509836  Contributors: Bearcat, GREENPHOSPHATEmicrobes, GreenPhosphateBacteria, JDP90,LilHelpa, Malcolma, Malcolmxl5, Nihiltres, Pinethicket, Sidelight12, 6 anonymous edits

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