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Economic Affairs
Year : 2015, Volume : 60, Issue : 4
First page : ( 803) Last page : ( 807)
Print ISSN : 0424-2513. Online ISSN : 0976-4666.
Article DOI : 10.5958/0976-4666.2015.00113.8

Solubilization of Tricalcium Phosphate and Production of IAA by Phosphate Solubilizing Bacteria Isolated from Tea Rhizosphere Soil

Panda Parimal1, Chakraborty Somsubhra1, Ray D.P.2*, Mahato Bisweswar3, Pramanik Bappa4, Choudhury Ashok1

1Department of Soil Science and Agricultural Chemistry, Uttar Banga Krishi Viswavidyalaya, Cooch Behar, West Bengal, India

2Senior Scientist, ICAR-National Institute of Research on Jute and Allied Fibre Technology, 12 Regent Park, Kolkata-700040, India

3Kalyan Krishi Vigyan Kendra, Purulia, West Bengal, India

4Majhian Krishi Vigyan Kendra, Dakshin Dinajpur, West Bengal, India

*Correspondence author: drdebprasadray@gmail.com

Online published on 29 January, 2016.

Abstract

Rhizospheric soil from tea [Camellia sinensis L.] was screened for the presence of phosphate solubilizing bacterial populationin-vitro where eight isolates were able to solubilize tri calcium phosphate in Pikovskaya's agar. These isolates were also screened for phosphate solubilization in liquid medium. Phosphate solubilizing activities of these strains were associated with a drop in the pH of the medium. Furthermore, these 8 isolated strains were inoculated in specific media containing tryptophan to produce growth regulating substances indole acetic acid (IAA) under in-vitro conditions. Amount of phosphate solubilized ranged from 11.07±0.91–82.77±0.96mg/l and IAA production ranged from 11.23–28.78 mg/l. These bacterial strains may be further characterized and field tested for their use as effective growth promoters for hill crops.

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Keywords

Tea, phosphate solubilizing bacteria, IAA.

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