Article

Stress induced phosphate solubilization in bacteria isolated from alkaline soils

Chandra Shekhar NautiyalMicrobiology Group, National Botanical Research Institute, Rana Pratap Marg, P.O. Box 436, Lucknow, IndiaShipra BhadauriaMicrobiology Group, National Botanical Research Institute, Rana Pratap Marg, P.O. Box 436, Lucknow 226 001, IndiaPradeep KumarMicrobiology Group, National Botanical Research Institute, Rana Pratap Marg, P.O. Box 436, Lucknow 226 001, IndiaHind LalMicrobiology Group, National Botanical Research Institute, Rana Pratap Marg, P.O. Box 436, Lucknow 226 001, IndiaRajesh MondalMicrobiology Group, National Botanical Research Institute, Rana Pratap Marg, P.O. Box 436, Lucknow 226 001, IndiaD. P. VermaMicrobiology Group, National Botanical Research Institute, Rana Pratap Marg, P.O. Box 436, Lucknow 226 001, India

2000en

ABI

Abstract

Phosphate solubilizing bacteria NBRI0603, NBRI2601, NBRI3246 and NBRI4003 were isolated from the rhizosphere of chickpea and alkaline soils. All four strains demonstrated diverse levels of phosphate solubilization activity under in vitro conditions in the presence of various carbon and nitrogen sources. Acid production may have contributed to phosphate solubilization, but was not the only reason for phosphate release into the medium. Among the four strains, NBRI2601 was the most efficient strain in terms of its capability to solubilize phosphorus in the presence of 10% salt, pH 12, or 45 degrees C. The strains showed varied levels of phosphate solubilization when the effects of different sources of nitrogen were examined during growth. The presence of low levels of Ca(2+) and EDTA in the medium enhanced phosphate solubilization.

Identifiers

DOI: 10.1111/j.1574-6968.2000.tb08910.x

Citations and references

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