The effect of copper on the effectiveness of biocontrol bacterium strains

Csaba Vágvölgyi, Katalin Körösi, Zsuzsanna Antal, György Túróczi, László Manczinger

Research output: Article

1 Citation (Scopus)

Abstract

Copper containing pesticides are widely used in the agriculture against phytopathogenic bacteria and fungi. As a result, the level of copper in agricultural soils is regularly high which could cause many ecotoxicological effects. Relevant co-application of biocontrol microorganisms with copper containing pesticides requires the evaluation of the copper tolerance levels of biocontrol microorganisms: especially the effect of copper ions on the antagonistic potential of the strains has to be investigated. From the soil samples of a Hungarian tomato plantation more than 200 bacterium strains had been isolated and their antagonistic potentials were evaluated against phytopathogenic microorganisms in in vitro confrontation tests. Twenty strains with the best antagonistic features have been selected for further investigations. The copper tolerances of these strains have been determined: it was clarified that all of them were able to grow up to 400 mg l-1 copper sulphate concentration. Changes of the antagonistic potential in dependence of the copper concentration were analysed in in vitro confrontation tests with different fungal (Pythium ultimum, Phytophthora infestans, Sclerotinia sclerotiorum, Fusarium oxysporum f.sp. lycopesici, Alternaria solani, Rhizoctonia solani) and bacterial (Pseudomonas syringae) phytopathogenic microorganisms. According these experiments, copper concentrations above 100 mg l-1 significantly increased the antagonistic effects of the biocontrol strains against fungal pathogens. At the same time, there was a substantial antagonostic effect between copper and the biocontrol bacteria against Pseudomonas syringae.

Original languageEnglish
Pages (from-to)589-592
Number of pages4
JournalCereal Research Communications
Volume37
Issue numberSUPPL.1
Publication statusPublished - dec. 1 2009

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Genetics

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