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Deciphering the role of plant growth-promoting rhizobacteria in the tolerance of the invasive cordgrass Spartina densiflora to physicochemical properties of salt-marsh soils

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Abstract

Background and aims

A glasshouse experiment was conceived to assess the role of a bacterial consortium (Pseudomonas composti SDT3, Aeromonasaquariorum SDT 13 and Bacillus sp. SDT14) isolated from the rizhosphere of S. densiflora on its growth and physiological tolerance to the physicochemical properties of marsh soils.

Methods

Two inoculation treatments (with and without inoculation) in combination with two soil types (from Piedras and Odiel marshes, SW Spain) were assigned for 50 days. Growth parameters, combined with measurements of gas exchange, efficiency of PSII biochemistry, photosynthetic pigments and leaf water content were measured. In addition, the accumulation of nutrients and trace elements were determined.

Results

The inoculation improved growth of S. densiflora through a beneficial effect on its photochemical apparatus due to its impact on chlorophyll concentration. This enhancement happened under both soil conditions and was mainly reflected in a greater length and diameter of roots. Also, inoculation favoured leaf water content through the decline in stomatal conductance and increment in root-to-shoot ratio. Moreover, this consortium was able to stimulate ion accumulation in roots and leaves.

Conclusions

Selected rhizospheric bacteria appear to play a significant role in S. densiflora growth response and tolerance to the physicochemical properties of marshes soils.

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Acknowledgments

We are grateful to Antonio Ruiz Rico for revision of the English text of this manuscript, Cristian Gómez for technical assistance and Antonio Diaz-Espejo for his altruistic help in lending some of the equipments. We also thank the Spanish Science and Technology Ministry and Junta de Andalucía for their support (projects CTM2008-04453 and RNM07274) and Seville University Glasshouse General Services for their collaboration. JM acknowledges financial support from the FPU Grant (Ref. AP2012-1809) awarded by Ministerio de Educación, Cultura y Deporte, Spain.

We also thank the useful comments of Editor who helped to improve the final version of the manuscript.

Conflict of interest

The authors declare that they have no conflict of interest.

Author information

Authors and Affiliations

  1. Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, Reina Mercedes s/n, 41012, Sevilla, Spain

    E. Mateos-Naranjo

  2. Departamento de Microbiologia, Facultad de Farmacia, Universidad de Sevilla, C/ Profesor García González 2, 41012, Sevilla, Spain

    J. Mesa, E. Pajuelo, M. A. Caviedes & I. D. Rodríguez-Llorente

  3. Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS), CSIC, Reina Mercedes 10, 41012, Sevilla, Spain

    A. Perez-Martin

Authors
  1. E. Mateos-Naranjo
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  2. J. Mesa
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  3. E. Pajuelo
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  4. A. Perez-Martin
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  5. M. A. Caviedes
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  6. I. D. Rodríguez-Llorente
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Corresponding author

Correspondence to E. Mateos-Naranjo.

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Responsible Editor: Timothy J. Flowers.

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Mateos-Naranjo, E., Mesa, J., Pajuelo, E. et al. Deciphering the role of plant growth-promoting rhizobacteria in the tolerance of the invasive cordgrass Spartina densiflora to physicochemical properties of salt-marsh soils. Plant Soil 394, 45–55 (2015). https://doi.org/10.1007/s11104-015-2504-7

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