World Journal of Microbiology and Biotechnology

, Volume 26, Issue 2, pp 265–272

Growth-promotion of strawberry plants inoculated with Azospirillum brasilense

  • Raúl O. Pedraza
  • Jessica Motok
  • Sergio M. Salazar
  • Alicia L. Ragout
  • María I. Mentel
  • María L. Tortora
  • María F. Guerrero-Molina
  • Beatriz C. Winik
  • Juan C. Díaz-Ricci
Original Paper

DOI: 10.1007/s11274-009-0169-1

Cite this article as:
Pedraza, R.O., Motok, J., Salazar, S.M. et al. World J Microbiol Biotechnol (2010) 26: 265. doi:10.1007/s11274-009-0169-1

Abstract

Azospirillum brasilense (strains REC3, RLC1, PEC5) were root inoculated in strawberry plants of the cultivars ‘Milsei’, ‘Selva’ and ‘Camarosa’ to assess plant growth-promoting effects. The bacteria were able to promote plant growth (expressed as root length, root area, and dry weight of root and shoot), depending on the genotypes of plants and bacteria used, whereas the stolon production (3–4) depended only on the strawberry cultivar. To explain whether root exudates plays any role on the growth-promotion observed herein, total protein and sugar were determined, and chemotaxis properties were evaluated. The strains showed positive chemotaxis toward the root exudates, being influenced by the total sugars content, suggesting that the latter plays an important role in the chemotaxis effect and may contribute to enhance the root capacity to recruit azospirilla from rhizosphere, thus improving the growth-promoting effect exerted by these bacteria.

Keywords

Azospirillum Strawberry Chemotaxis Plant growth-promoting effect 

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Raúl O. Pedraza
    • 1
  • Jessica Motok
    • 1
  • Sergio M. Salazar
    • 1
  • Alicia L. Ragout
    • 2
  • María I. Mentel
    • 1
  • María L. Tortora
    • 1
  • María F. Guerrero-Molina
    • 1
  • Beatriz C. Winik
    • 3
  • Juan C. Díaz-Ricci
    • 3
  1. 1.Facultad de Agronomía y ZootecniaUniversidad Nacional de TucumánTucumánArgentina
  2. 2.PROIMI-CONICETTucumánArgentina
  3. 3.Instituto Superior de Investigaciones Biológicas (INSIBIO-UNT-CONICET), Instituto de Química Biológica “Dr. Bernabé Bloj”, Facultad de Bioquímica, Química y FarmaciaUNTTucumánArgentina