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Performance evaluation of potent phosphate solubilizing bacteria in potato rhizosphere

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Abstract

Three phosphate solubilizing bacterial isolates identified as Pantoea agglomerans strain P5, Microbacterium laevaniformans strain P7 and Pseudomonas putida strain P13 were assessed for mutual relationships among them, competitiveness with soil microorganisms and associations with plant root using luxAB reporter genes for follow-up studies. Synergism between either P. agglomerans or M. laevaniformans, as acid-producing bacteria, and P. putida, as a strong phosphatase producer, was consistently observed both in liquid culture medium and in root rhizosphere. All laboratory, greenhouse and field experiments proved that these three isolates compete well with naturally occurring soil microorganisms. Consistently, the combinations of either P. agglomerans or M. laevaniformans strains with Pseudomonas putida led to higher biomass and potato tuber in greenhouse and in field trials. It is conceivable that combinations of an acid- and a phosphatase-producing bacterium would allow simultaneous utilization of both inorganic and organic phosphorus compounds preserving the soil structure.

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Acknowledgments

This research was partially supported by a grant from National Research Council of I.R. Iran. We would like to thank Prof. Hani Antoun for his critical revision of this manuscript.

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Correspondence to Mohammad Ali Malboobi.

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Malboobi, M.A., Behbahani, M., Madani, H. et al. Performance evaluation of potent phosphate solubilizing bacteria in potato rhizosphere. World J Microbiol Biotechnol 25, 1479–1484 (2009). https://doi.org/10.1007/s11274-009-0038-y

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  • DOI: https://doi.org/10.1007/s11274-009-0038-y

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