In vitro inhibition of mycelial growth of Phytophthora nicotianae Breda de Haan from different hosts by Brassicaceae species. Effect of the developmental stage of the biofumigant plants

Pest Manag Sci. 2012 Sep;68(9):1317-22. doi: 10.1002/ps.3310. Epub 2012 May 15.

Abstract

Background: The hydrolysis products of glucosinolates in Brassicaceae tissues are potentially useful for the control of fungal pathogens. The in vitro activity of these products against Phytophthora nicotianae Breda de Haan was studied, with the isolates exposed to the volatile products released from the brassica tissues.

Results: The four species of Brassicaceae tested inhibited the mycelial growth of P. nicotianae isolates. The most effective developmental stage was different, depending on the species: buds yellowing in Sinapis alba L. and Brassica carinata A. Braun; seeds enlarging and all buds open in Brassica nigra (L.) W.D.J. Koch; cauliflower still covered by leaves in Brassica oleracea L. var. botrytis. At this stage, B. nigra and S. alba were the most effective (53.6 and 52.5% inhibition respectively). With all the biofumigants species tested, isolates from pepper plants were more susceptible to the brassica effect than those from tomato isolates.

Conclusion: The developmental stage of plants has an influence on the biofumigant potential of Brassicaceae species against P. nicotianae. The isolates differ in susceptibility to compounds released, depending on their host of origin, suggesting the differentiation of populations of P. nicotianae in relation to the host of origin.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antifungal Agents / metabolism
  • Antifungal Agents / pharmacology
  • Brassicaceae / chemistry*
  • Brassicaceae / growth & development*
  • Brassicaceae / metabolism
  • Brassicaceae / microbiology
  • Capsicum / microbiology
  • Down-Regulation
  • Fumigation
  • Host Specificity
  • Isothiocyanates / metabolism
  • Isothiocyanates / pharmacology
  • Mycelium / drug effects
  • Mycelium / growth & development*
  • Phytophthora / drug effects
  • Phytophthora / growth & development*
  • Phytophthora / isolation & purification
  • Phytophthora / physiology
  • Plant Diseases / microbiology
  • Solanum lycopersicum / microbiology

Substances

  • Antifungal Agents
  • Isothiocyanates
  • isothiocyanic acid