Induction of resistance in pepper against Verticillium dahliae by the application of PO212

  1. Lois, Marta
Supervised by:
  1. José Díaz Varela Director
  2. Javier Veloso Freire Co-director

Defence university: Universidade da Coruña

Fecha de defensa: 10 December 2019

Committee:
  1. Inmaculada Larena Chair
  2. Néstor Carrillo Barral Secretary
  3. Paula Baptista Committee member

Type: Thesis

Teseo: 610014 DIALNET lock_openRUC editor

Abstract

The biological control agent (BCA) Penicillium rubens (formerly Penicillium oxalicum) strain 212 (PO212) was employed as inducer of resistance in pepper (Capsicum annuum L.) against the vascular pathogen Verticillium dahliae Kleb. PO212 protected pepper plants against V. dahliae. The observed induced resistance in pepper involves cell wall reinforcement with an increase in lignin as well as other defenses as PR proteins. Signaling of the defense response triggered in pepper or tomato by PO212 is mediated by hydrogen peroxide, salicylic acid, ethylene and jasmonic acid. Induced resistance is one of the mechanisms by which PO212 protects pepper against V. dahliae. The combination of PO212 with the fungal BCAs known as arbuscular mycorrhizal fungi (AMF) can improve biological control effectiveness. Soil suppressiveness to V. dahliae and the oomycete Phytophthora capsici in pepper greenhouses appears to be related with AMF community.