Gulati, Arvind and Vyas, P and Sharma, N and Sood, S and Rahi, P and Pathania, V and Prasad, R (2010) Organic acid production and plant growth promotion as a function of phosphate solubilization by Acinetobacter rhizosphaerae strain BIHB 723 isolated from the cold deserts of the trans-Himalayas. Achives of Microbiology, 192 (11). pp. 975-983. ISSN 0302-8933

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An efficient phosphate-solubilizing plant growth-promoting Acinetobacter rhizosphaerae strain BIHB 723 exhibited significantly higher solubilization of tricalcium phosphate (TCP) than Udaipur rock phosphate (URP), Mussoorie rock phosphate (MRP) and North Carolina rock phosphate (NCRP). Qualitative and quantitative differences were discerned in the gluconic, oxalic, 2-keto gluconic, lactic, malic and formic acids during the solubilization of various inorganic phosphates by the strain. Gluconic acid was the main organic acid produced during phosphate solubilization. Formic acid production was restricted to TCP solubilization and oxalic acid production to the solubilization of MRP, URP and NCRP. A significant increase in plant height, shoot fresh weight, shoot dry weight, root length, root dry weight, and root, shoot and soil phosphorus (P) contents was recorded with the inoculated treatments over the uninoculated NP(0)K or NP(TCP)K treatments. Plant growth promotion as a function of phosphate solubilization suggested that the use of bacterial strain would be a beneficial addition to the agriculture practices in TCP-rich soils in reducing the application of phosphatic fertilizers.

Item Type: Article
Uncontrolled Keywords: Acinetobacter rhizosphaerae; Phosphate-solubilizing rhizobacteria; Phosphate substrates; Plant growth promotion; Organic acids; Maize
Subjects: Microbiology
Depositing User: Dr. Aparna Maitra Pati
Date Deposited: 28 Dec 2011 06:13
Last Modified: 28 Dec 2011 06:13

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