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Effect of Silicon and Phosphate-Solubilizing Bacteria on Improved Phosphorus (P) Uptake Is Not Specific to Insoluble P-Fertilized Sorghum (Sorghum bicolor L.) Plants

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Abstract

In the research, the single-and dual effects of phosphate-solubilizing bacteria (PSB) (B0, Pseudomonas sp. FA1, and Bacillus simplex UT1) and silicon (Si) (0, 150, 300, and 600 mg kg−1 used as silicic acid) on P uptake by sorghum (Sorghum bicolor L.) plant fertilized with soluble or insoluble P (rock phosphate—RP) were studied via a perlite-potted experiment. Moreover, the effects of various treatments on morphological (shoot and root dry weight), nutritional (the uptake of Si and K) and physiological parameters (activity of catalase, superoxide dismutase, and peroxidase enzymes) of this plant were also measured. When grown in RP-fertilized medium compared with those grown in soluble P-fertilized medium, both shoot biomass and root biomass of sorghum plants were noticeably diminished. The PSB strains and Si levels independently improved all the aforementioned parameters. Use of Si and PSB strains to sorghum plants grown in soluble P or insoluble P medium significantly augmented P use efficiency. Silicon not only augmented the uptake of P from sparingly soluble-P source (RP), but also augmented uptake of P from water-soluble P source. Both B. simplex UT1 and Pseudomonas sp. FA1 indicated a meaningful betterment in sorghum plant dry matter and uptake of P (and K and Si) under both soluble and insoluble P fertilization conditions with Pseudomonas sp. FA1 being more efficacious than B. simplex UT1. But, the dual use of the PSB with Si resulted in the greatest increase in sorghum plant P uptake and other measured growth indices. Application of 600 mg Si kg−1 and Pseudomonas sp. FA1 significantly augmented the P shoot concentration of sorghum plant fertilized with RP to an sufficient level (> 0.3%) in the range of P-fertilized sorghum plants. Therefore, in addition to PSB utilization, Si should be considered as soil amendment in agricultural soils inadequate in plant-available Si as a means of sustainable agriculture with respect to possible savings of scarce P resources.

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Acknowledgements

For providing the necessary facilities and funding for doing this study, we wish to thank University of Tehran.

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Authors and Affiliations

  1. Department of Soil Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Tehran, 31587-77871, Iran

    Leila Rezakhani, Babak Motesharezadeh, Hassan Etesami & Hossein Mirseyed Hosseini

  2. Soil and Water Research Institute (SWRI), Karaj, Iran

    Mohammad Mehdi Tehrani

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  1. Leila Rezakhani
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  2. Babak Motesharezadeh
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  3. Mohammad Mehdi Tehrani
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  4. Hassan Etesami
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  5. Hossein Mirseyed Hosseini
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Contribution of three authors to this study was the same.

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Correspondence to Babak Motesharezadeh or Hassan Etesami.

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Rezakhani, L., Motesharezadeh, B., Tehrani, M.M. et al. Effect of Silicon and Phosphate-Solubilizing Bacteria on Improved Phosphorus (P) Uptake Is Not Specific to Insoluble P-Fertilized Sorghum (Sorghum bicolor L.) Plants. J Plant Growth Regul 39, 239–253 (2020). https://doi.org/10.1007/s00344-019-09978-x

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