Solubilization of inorganic phosphates and growth emergence of wheat as affected by Azotobacter chroococcum mutants

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...

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Bibliographic Details
Published in:Biology and fertility of soils 1999, Vol.28 (3), p.301-305
Main Authors: Kumar, V, Narula, N
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Azotobacter chroococcum
Biochemistry and biology
Biological and medical sciences
biosynthesis
Chemical, physicochemical, biochemical and biological properties
Fundamental and applied biological sciences. Psychology
genetic variation
genotype
growth
indole acetic acid
Microbiology
mutants
nutrient availability
Physics, chemistry, biochemistry and biology of agricultural and forest soils
rhizosphere
roots
seedling emergence
Soil science
solubility
symbiosis
tricalcium phosphate
Triticum aestivum
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Summary: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 microgram ml-1 MRP 0.19 microgram 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 microgram/ml-1 of TCP and 0.19-0.22 microgram 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.
ISSN:0178-2762
1432-0789
DOI:10.1007/s003740050497