Solubilization of inorganic phosphates and growth emergence of wheat as affected by Azotobacter chroococcum mutants |
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Authors: | V Kumar Neeru Narula |
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Institution: | (1) Department of Microbiology, CCS Haryana Agricultural University, Hisar-125 004, India, IN |
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Abstract: | Phosphate-solubilizing strains of A. chroococcum isolated from the wheat rhizosphere were evaluated for their ability to solubilize tricalcium phosphate (TCP), Mussoorie
rock phosphate (MRP) and also for indole-acetic-acid (IAA) production. Strains were selected on the basis of the clearance
zone on solid agar media of Pikovskaya and Jensen's media containing TCP, and phosphate solubilization in Jensen's liquid
culture medium containing both TCP and MRP. Mutants of the best phosphate-solubilizing (TCP 1.52 μg ml–1 MRP 0.19 μg ml–1), IAA-producing A. chroococum strain P-4, were developed and screened for P solubilization and phytohormone production. Five mutants solubilized more P
(in the range of 1.5–1.7 μg/ml–1 of TCP and 0.19–0.22 μg ml–1 of MRP) than the parent strains. In vitro growth emergence studies of three wheat varieties, viz. C-306, WH-542 and HD-2009, showed better performance with phosphate-solubilizing
mutants than with the parent strain.
Received: 15 October 1997 |
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Keywords: | Azotobacter chroococcum Inorganic phosphate solubilization Indole acetic acid Growth emergence Wheat Phytohormone production Rhizosphere Phosphate solubilizing bacteria |
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