Vol. 54 No. 2 (2015): 9th IWGTD - Special issue on Grapevine Trunk Diseases
Research Papers

Potato seed dressing with Pseudomonas aeruginosa strain RZ9 enhances yield and reduces black scurf

Moncef MRABET
Centre of Biotechnology of Borj-Cedria, BP. 901, Hammam-Lif 2050, Tunisia
Salem ELKAHOUI
Centre of Biotechnology of Borj-Cedria, BP. 901, Hammam-Lif 2050, Tunisia
Belhassen TARHOUNI
Technical Centre of Potato and Artichoke, Route Jedaida, Saïda 2031, Tunisia
Naceur DJEBALI
Centre of Biotechnology of Borj-Cedria, BP. 901, Hammam-Lif 2050, Tunisia

Published 2015-09-15

Keywords

  • biocontrol,
  • Rhizoctonia solani,
  • Solanum tuberosum

How to Cite

[1]
M. MRABET, S. ELKAHOUI, B. TARHOUNI, and N. DJEBALI, “Potato seed dressing with Pseudomonas aeruginosa strain RZ9 enhances yield and reduces black scurf”, Phytopathol. Mediterr., vol. 54, no. 2, pp. 265–274, Sep. 2015.

Abstract

A rhizospheric strain RZ9 of Pseudomonas aeruginosa was assessed for in-vitro growth inhibition of Rhizoctonia solani and effectiveness to control black scurf on potatoes (Solanum tuberosum L.) of the cultivars Spunta and Nicola, in greenhouse and field experiments. The strain RZ9 inhibited R. solani mycelial growth by more than 60% and completely inhibited the germination of sclerotia from infested potato tubers in in-vitro tests. In greenhouse assays, seed potato treatment with RZ9 cell suspension increased stem length, decreased the relative weight of infected potato tubers (by 67%), and increased the potato yield (by 16%) compared to pathogen-inoculated plants for both potato cultivars. In field trials conducted on sandy soils during 2012 and 2013, strain RZ9 reduced black scurf incidence and increased potato yield by an average of 5.3 t ha-1 for ′Spunta′ and 5 t ha-1 for ′Nicola′. This study showed that the selected strain of P. aeruginosa is an efficient bacterium for enhancing yield and reducing black scurf of field-grown potatoes.

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