Induced resistance to Botrytis cinerea in Capsicum annuum by a Fusarium crude elicitor fraction, free of proteins

Authors

  • J. Veloso,

    1. Depto. de Bioloxía Animal, Bioloxía Vexetal e Ecoloxía, Universidade da Coruña, Coruña, Spain
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  • J. Díaz

    Corresponding author
    1. Depto. de Bioloxía Animal, Bioloxía Vexetal e Ecoloxía, Universidade da Coruña, Coruña, Spain
    • Correspondence

      José Díaz, Depto. de Bioloxía Animal, Bioloxía Vexetal e Ecoloxía, Universidade da Coruña, Campus da Zapateira s/n. E-15071, A Coruña, Spain.

      E-mail: josefv@udc.es

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Abstract

Fusarium oxysporum f. sp. lycopersici (FOL) induces resistance in pepper against the airborne pathogen Botrytis cinerea and the soil-borne pathogen Verticillium dahliae. However, its practical use is limited due to its pathogenicity to other crops. In this study we tested several fractions of a heat-sterilised crude FOL-elicitor preparation to protect pepper against B. cinerea and V. dahliae. Only the protein-free insoluble fraction of the preparation reduced B. cinerea infection. However, none of the fractions reduce V. dahliae symptoms. The insoluble protein-free fraction induced expression of defence genes in the plant, namely a chitinase (CACHI2), a peroxidase (CAPO1), a sesquiterpene cyclase (CASC1) and a basic PR1 (CABPR1). Even though the CASC1 gene was not induced directly after treatment with the insoluble fraction in the leaves, it was induced after B. cinerea inoculation, showing a priming effect. The insoluble protein-free FOL-elicitor protected pepper against the airborne pathogen through a mechanism that involves induced responses in the plant, but different to the living FOL.

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