Vol. 52 No. 3 (2013)
Research Papers

Efficacy of selected Pseudomonas strains for biocontrol of Rhizoctonia solani in potato

Moncef MRABET
Laboratory of Legumes, Center of Biotechnology of Borj Cédria (CBBC), BP 901, 2050 Hammam-Lif, Tunisia.
Naceur DJEBALI
Laboratory of Molecular Physiology of Plants, Center of Biotechnology of Borj Cédria (CBBC), BP 901, 2050 Hammam-Lif, Tunisia.
Salem ELKAHOUI
Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cédria (CBBC), BP 901, 2050 Hammam-Lif, Tunisia.
Youssra MILOUD
Laboratory of Legumes, Center of Biotechnology of Borj Cédria (CBBC), BP 901, 2050 Hammam-Lif, Tunisia.
Sabrine SAÏDI
Laboratory of Legumes, Center of Biotechnology of Borj Cédria (CBBC), BP 901, 2050 Hammam-Lif, Tunisia.
Belhassen TARHOUNI
Technical Center of Potato and Artichoke, CTPTA, 2031 Essaïda, Tunisia.
Ridha MHAMDI
Laboratory of Legumes, Center of Biotechnology of Borj Cédria (CBBC), BP 901, 2050 Hammam-Lif, Tunisia.

Published 2013-11-17

Keywords

  • antibiosis,
  • black scurf,
  • biocontrol,
  • potato

How to Cite

[1]
M. MRABET, “Efficacy of selected Pseudomonas strains for biocontrol of Rhizoctonia solani in potato”, Phytopathol. Mediterr., vol. 52, no. 3, pp. 449–456, Nov. 2013.

Abstract

Thirty seven bacterial isolates from faba bean (Vicia faba L.) root-nodules were screened for their antagonistic activity against eight Rhizoctonia solani strains isolated from infected potato (Solanum tuberosum L.) tubers. Two bacterial strains (designated as Kl.Fb14 and S8.Fb11) gave 50% in vitro inhibition of R. solani mycelial growth. 16S rDNA sequence analysis indicated that strain Kl.Fb14 exhibited 99.5% identity with Pseudomonas moraviensis, and that S8.Fb11 exhibited 99.8% identity with Pseudomonas reinekei. Greenhouse trials in soil showed that strain S8.Fb11 reduced the percentage of sclerotia on potato tubers and amounts of tuber infection for the potato cultivars Spunta and Nicola. In a field trial conducted in South Tunisia, infection with R. solani reduced potato yield by approximately 40% for ‘Spunta’ and 17% for ‘Nicola’; about 20% of the total tuber production was severely infected. However, when potato tubers were treated with strain S8.Fb11 prior to sowing, disease incidence was reduced to 6% of total production with low infection levels; potato yield was enhanced by about 6 kg per 10 m row in comparison to R. solani infected plants. The second selected Pseudomonas sp. (strain Kl.Fb14) did not affect either the levels of sclerotia on tubers or potato yield.

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