Abstract
There is not much information on the mechanism(s) by which phosphate solubilizing microorganisms (PSM) increase plant phosphorus (P) uptake. Studies with PSM inoculated wheat plants grown in both microcosms and rhizoboxes were conducted to determine whether inoculations with PSMs acidify rhizosphere. Significant (P < 0.05) increases by bacterial inoculation were obtained in rate of proton efflux by roots (by the strains # 67, 189, and 73), plant P uptake (by # 169 and 189), K uptake (by # 67, 189, 73, 169, and 145), and uptake of P against the uptake of Ca and Mg (by # 67, 189, 73, 169, and 145) in a calcerous soil without fertilization. Only Bacillus sp. # 189 significantly (P < 0.05) raised available P in the rhizosphere. Plant available P by Olsen extraction in the control and the # 189 inoculation were 6.3 and 8.0 mg kg-1, respectively. The root induced acidification in nutrient solution with ammonium (NH +4 -N) supply by inoculation of Bacillus sp. # 189 was confirmed in a rhizobox experiment when nitrogen source was NH +4 -N. Enhanced proton extrusion by plant roots accompanied probably by the release of extra organic acid anions may contribute to mobilization and uptake of P in Bacillus sp. # 189 inoculated wheat plants in this study. The changes in total uptake and balance of nutrients in the PSM inoculations imply a modification of plant cell metabolism.
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References
Amooaghaie R, Mostajeran A, Emtiazi G (2002) The effect of compatible and incompatible Azospirillum brasilense strains on proton efflux of wheat root. Plant Soil 243:155–160
Babu-Khan S, Yeo TC, Martin WL, Duron MR, Rogers RD, Goldstein AH (1995) Cloning of a mineral phosphate-solubilizing gene from Pseudomonas cepacia. Appl Environ Microbiol 61:972–978
Bashan Y (1990) Short exposure to Azospirillum brasilense Cd inoculation enhanced proton efflux of intact wheat roots. Can J Microbiol 36:419–425
Bashan Y, Holguin G, de-Bashan LE (2004) Azospirillum-plant relationships: physiological, molecular, agricultural, and environmental advances (1997–2003). Can J Microbiol 50:521–577
Bashan Y, Levanony H, Mitiku G (1989) Changes in proton efflux of intact wheat roots induced by Azospirillum brasilense Cd. Can J Microbiol 35:691–697
El-Tarabily KA, Nassar AH, Sivasithamparam K (2008) Promotion of growth of bean (Phaseolus vulgaris L.) in a calcerous soil by a phosphate-solubilizing, rhizosphere-competent strain of Micromonospora endolithica. Applied Soil Ecol 39:161–171
Fahraeus G (1957) The infection of clover root hairs by nodule bacteria studied by a simple glass slide technique. J Gen Microbiol 16:374–381
Gaind S, Gaur AC (2002) Impact of fly ash and phosphate solubilizing bacteria on soybean productivity. Bioresource Technol 85:313–315
Hamdali H, Hafidi M, Virolle MJ, Ouhdouch Y (2008) Growth promotion and protection against damping-off of wheat by two rock phosphate solubilizingactinomycetes in a P-deficient soil under greenhouse conditions. Appl Soil Ecol 40:510–517
Hameeda B, Harini G, Rupela OP, Wani SP, Reddy G (2008) Growth promotion of maize by phosphate-solubilizing bacteria isolated from composts and macrofauna 163:234–242
Häussling M, Leisen E, Marschner H, Römheld V (1985) An improved method for non-destructive measurements of the pH at the root-soil interface (Rhizosphere). J Plant Physiol 117:371–375
Hedley MJ, Nye PH, White RE (1983) Plant induced changes in the rhizosphere of rape seedlings. IV. The effect of soil phosphorus fractions in the rhizosphere and on the cation-anion balance in the plants. New Phytol 95:69–82
Krishnaraj PU, Goldstein AH (2001) Cloning of Serratia marcescens DNA fragment that induces quinoprotein glucose dehydrogenase-mediated gluconic acid production in Escherichia coli in the presence of stationary phase Serratia marcescens. FEMS Microbiol Lett 205:215–220
Lin W, Okon Y, Hardy RWF (1983) Enhanced mineral uptake by Zea mays and Sorghum bicolor roots inoculated with Azospirillum brasilense. Appl Environ Microbiol 45:1775–1779
Marschner H, Romheld V, Ossenberg–Neuhaus H (1982) Rapid method for measuring changes in pH and reducing processes along roots of intact plants. Z Pflanzenphysiol 105:407–416
Mittal V, Singh O, Nayyar H, Kaur J, Tewari R (2008) Stimulatory effect of phosphate-solubilizing fungal strains (Aspergillus awamori and Penicillium citrinum) on the yield of chickpea (Cicer arietinum L. cv. GPF2). Soil Biol Biochem 40:718–727
Neumann G (2006) Plant culture systems by construction and setup of rhizoboxes. In: Fitz WJ, Puschenreiter M, Wenzel WW, Chapter editors (eds) 1.1. Growth systems. In: Luster J, Finlay R (eds) Handbook of Methods used in Rhizosphere Research, Swiss Federal Institute for Forest, Snow, and Landscape Research, Birmensdorf, Switzerland, online at: www.rhizo.at/handbook.
Neumann G, Römheld V (2002) Root-induced changes in the availability of nutrients in the rhizosphere. In: Waisel Y, Eshel A, Kafkafi U (eds) Plant Roots: The Hidden Half. Marcel Dekker, Inc., New York, pp 617–649
Olsen SR, Sommers LE (1982) Phosphorus. In: Page AL et al (eds) Methods of Soil Analysis, Part II: Chemical and Microbiological Properties. SSSA Inc., Madison, pp 403–430
Pal SS (1998) Interactions of an acid tolerant strain of phosphate solubilizing bacteria with a few acid tolerant crops. Plant Soil 198:169–177
Peix A, Mateos PF, Rodriguez-Barrueco C, Martinez-Molina E, Velazque E (2001) Growth promotion of common bean (Phaseolus vulgaris L.) by a strain of Burkholderia cepacia under growth chamber conditions. Soil Biol Biochem 33:1927–1935
Puente ME, Li CY, Bashan Y (2004) Microbial population and activities in the rhizoplane of rock-weathering desert plants. II. Growth promotion of cactus seedlings. Plant Biol 6:643–650
Rodriguez H, Gonzales T, Goire I, Bashan Y (2004) Gluconic acid production and phosphate solubilization by the plant growth-promoting bacterium Azospirillum spp. Naturwissenschaften 91:552–555
Stevenson FJ (1986) Cycles of carbon, nitrogen, phosphorus, sulphur, and micronutrients. Wiley, New York
Ström L, Owen AG, Godbold DL, Jones DL (2002) Organic acid mediated P mobilization in the rhizosphere and uptake by maize roots. Soil Biol Biochem 34:703–710
Thomson CJ, Marschner H, Römheld V (1993) Effect of nitrogen fertilizer form on pH of the bulk soil and rhizosphere, and on the growth, phosphorus, and micronutrient uptake of bean. J Plant Nutr 16:493–506
Wan JHC, Wong MH (2004) Effects of earthworm activity and P-solubilizing bacteria on P availability in soil. J Plant Nutr Soil Sci 167:209–213
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We gratefully acknowledge the funding of this project by The Scientific and Technological Research Council of Turkey (TUBITAK) and Selcuk University.
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Responsible Editor: Hans Lambers.
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Öğüt, M., Er, F. & Neumann, G. Increased proton extrusion of wheat roots by inoculation with phosphorus solubilising microorganims. Plant Soil 339, 285–297 (2011). https://doi.org/10.1007/s11104-010-0578-9
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DOI: https://doi.org/10.1007/s11104-010-0578-9