title: 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.
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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: Centro de Investigación Agraria Finca La Orden-Valdesequera, Junta de Extremadura, Finca La Orden, Guadajira, Badajoz, Spain. carmen.mrodriguez@juntaextremadura.net
authors.forename: Carmen
authors.initials: C
authors.lastname: Morales-Rodríguez
authors.forename: Julia
authors.initials: J
authors.lastname: Picón-Toro
authors.forename: Carolina
authors.initials: C
authors.lastname: Palo
authors.forename: Eloy J
authors.initials: EJ
authors.lastname: Palo
authors.forename: Ángela
authors.initials: Á
authors.lastname: García
authors.forename: Carmen
authors.initials: C
authors.lastname: Rodríguez-Molina
mesh_terms: D000935:Antifungal Agents / Q000378:metabolism / Q000494:pharmacology; D019607:Brassicaceae / Q000737:chemistry* / Q000254:growth & development* / Q000378:metabolism / Q000382:microbiology; D002212:Capsicum / Q000382:microbiology; D015536:Down-Regulation; D005651:Fumigation; D058507:Host Specificity; D017879:Isothiocyanates / Q000378:metabolism / Q000494:pharmacology; D018551:Solanum lycopersicum / Q000382:microbiology; D025282:Mycelium / Q000187:drug effects / Q000254:growth & development*; D010838:Phytophthora / Q000187:drug effects / Q000254:growth & development* / Q000302:isolation & purification / Q000502:physiology; D010935:Plant Diseases / Q000382:microbiology
chemical_list: D000935:Antifungal Agents; D017879:Isothiocyanates; C037152:isothiocyanic acid