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  • Title: Induced resistance in melon plants against Fusarium oxysporum f.sp. melonis caused by a nonpathogenic isolate of the same formae specialis.
    Author: Chikh-Rouhou H, Alvarez M, González-Torres R.
    Journal: Commun Agric Appl Biol Sci; 2006; 71(3 Pt B):985-91. PubMed ID: 17390848.
    Abstract:
    Melon 'Charentais T' susceptible to Fusarium oxysporum f. sp. melonis (Fom) race 1.2 was pre-inoculated, as a resistance inducer agent, with a nonpathogenic isolate of Fom. The biocontrol agent was only effective when it was applied one or two days before a challenge inoculation with the pathogen. Simultaneous inoculation did not provide any durable protection. Melon cv 'Charentais Fom 1' carries a single dominant gene conferring resistance against Fom races 0 and 2, whereas 'Charentais Fom 2' carries a single dominant gene conferring resistance against races 0 and 1 but both genotypes are susceptible to Fom race 1.2. Co-inoculation with conidia of race 0 provided almost complete protection against the pathogenic race 1.2. It may be hypothesised that while in contact with the host, the non-pathogenic races of the melon Fusarium either possess or secrete an inducing factor causing a defence reaction in melons possessing a resistance gene and preventing the proliferation of the pathogenic race either by formation of a mechanical barrier or by the synthesis of fungistatic substances.
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