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Can co-inoculation of Bradyrhizobium and Azospirillum alleviate adverse effects of drought stress on soybean (Glycine max L. Merrill.)?

  • Elijanara Raissa Silva
  • Jardel Zoz
  • Carlos Eduardo Silva Oliveira
  • Alan Mario Zuffo
  • Fábio SteinerEmail author
  • Tiago Zoz
  • Eduardo Pradi Vendruscolo
Original Paper

Abstract

Harnessing the beneficial potential of plant growth-promoting rhizobacteria may be an alternative strategy to improve plant tolerance to drought stress. The effect of inoculation with Bradyrhizobium japonicum and Azospirillum brasilense either alone or in combination on the plant growth and drought tolerance of soybean [Glycine max (L.) Merrill.] was investigated in this study in greenhouse conditions. Treatments were arranged in a randomized block design in a 3 × 4 factorial: three irrigation regimes [100% of pot capacity—PC (well-watered control), 50% of PC (moderate stress) and 25% of PC (severe stress)] and four inoculation treatments [control (non-inoculated), inoculation with B. japonicum, inoculation with A. brasilense, and co-inoculation with B. japonicum and A. brasilense]. Leaf relative water content, cell membrane stability, root nodulation, plant growth, and morphophysiological indexes were recorded. The inoculation of soybean plants with B. japonicum and A.brasilense either alone or in combination improved leaf membrane stability under drought stress conditions when compared to non-inoculated plants; however, this lower damage to cell membranes was not sufficient to maintain the leaf water content of the plant under drought stress. Plants co-inoculated with B. japonicum and A.brasilense improved the root nodulation under severe drought conditions. Inoculation of B. japonicum and A. brasilense either alone or in combination reduced the pod abortion rate under moderate drought stress, but had no effect under severe drought stress. In summary, the co-inoculation of A. brasilense and B. japonicum alleviate adverse effects limited by drought stress to the growth of soybeans.Author: Please check and confirm that the authors [Elijanara Raissa Silva, Carlos Eduardo Silva Oliveira, Alan Mario Zuffo, Eduardo Pradi Vendruscolo] and their initials have been correctly identified and amend if necessary.The authors were correctly identified.

Keywords

Glycine max (L.) Merrill. Plant growth-promoting rhizobacteria Inoculation Drought tolerance 

Notes

Acknowledgements

To CNPq (National Council for Scientific and Technological Development) and UEMS (State University of Mato Grosso do Sul) for the scientific initiation scholarship granted to the second author.

Author contributions

ERS, JA, AMZ, and FA designed and carried out the experiment. ERS, JZ, FS, and AMZ collected the data. FS and AMZ performed the analysis. ERS, JZ, CESO, and AMZ contributed to the interpretation of the results. FA wrote the manuscript. TZ and EPV contributed to the final version of the manuscript. All authors provided critical feedback and helped to shape the research, analysis, and manuscript.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Elijanara Raissa Silva
    • 1
  • Jardel Zoz
    • 2
  • Carlos Eduardo Silva Oliveira
    • 2
  • Alan Mario Zuffo
    • 3
  • Fábio Steiner
    • 2
    Email author
  • Tiago Zoz
    • 2
  • Eduardo Pradi Vendruscolo
    • 2
  1. 1.Department of Crop ScienceState University of Santa Catarina, UDESCLagesBrazil
  2. 2.Department of Crop ScienceState University of Mato Grosso do Sul, UEMSCassilândiaBrazil
  3. 3.Department of AgronomyFederal University of Mato Grosso do Sul, UFMSChapadão do SulBrazil

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