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Growth-promotion of strawberry plants inoculated with Azospirillum brasilense

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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.

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Acknowledgements

This study was supported by grant BID1728 OC-AR/PICTO 2004 N° 860 of Agencia Nacional de Promoción Cientifica y Tecnológica.

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Authors and Affiliations

  1. Facultad de Agronomía y Zootecnia, Universidad Nacional de Tucumán, Avda. Roca 1900, 4000, Tucumán, Argentina

    Raúl O. Pedraza, Jessica Motok, Sergio M. Salazar, María I. Mentel, María L. Tortora & María F. Guerrero-Molina

  2. PROIMI-CONICET, Avda. Belgrano y Pasaje Caseros, 4000, Tucumán, Argentina

    Alicia L. Ragout

  3. Instituto Superior de Investigaciones Biológicas (INSIBIO-UNT-CONICET), Instituto de Química Biológica “Dr. Bernabé Bloj”, Facultad de Bioquímica, Química y Farmacia, UNT, Chacabuco 461, 4000, Tucumán, Argentina

    Beatriz C. Winik & Juan C. Díaz-Ricci

Authors
  1. Raúl O. Pedraza
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  2. Jessica Motok
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  3. Sergio M. Salazar
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  4. Alicia L. Ragout
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  5. María I. Mentel
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  6. María L. Tortora
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  7. María F. Guerrero-Molina
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  8. Beatriz C. Winik
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  9. Juan C. Díaz-Ricci
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Corresponding author

Correspondence to Raúl O. Pedraza.

Additional information

Juan C. Díaz-Ricci is researcher of Conicet. María L. Tortora and María F. Guerrero-Molina are Conicet fellows.

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Pedraza, R.O., Motok, J., Salazar, S.M. et al. Growth-promotion of strawberry plants inoculated with Azospirillum brasilense . World J Microbiol Biotechnol 26, 265–272 (2010). https://doi.org/10.1007/s11274-009-0169-1

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  • DOI: https://doi.org/10.1007/s11274-009-0169-1

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