Characterization of the inhibitory effect of peach surface phenolic compounds on the conidial germination and pathogenicity of Monilinia laxa
2012
Su , Fan (INRA , Montfavet (France). UR 0407 Pathologie Végétale)
Previous studies have shown that certain phenolic compounds have inhibitory effects in vitro and/or in vivo against Monilinia sp. Caffeic, p-coumaric, ferulic, 3, 5-dicaffeoyliquinic, chlorogenic and neochlorogenic acids, catechin and epicatechin are phenolic compounds known to be present in the epidermis of peach fruit (Prunus persica). The objectives of my internship work were to evaluate their effect on conidial germination and pathogenicity of Monilinia laxa on petals of different Prunus sp genotypes. The petals of the six almond genotypes tested and peach "8858" were relatively resistant to M. laxa. At a concentration of 2 mM, all compounds showed significant inhibitory effect on petals of almond "ZH81". Ferulic acid inhibited almost entirely lesion growth on petals of all Prunus genotypes, as well as conidial germination and mycelial growth on artificial media. At lower doses down to 0.5 mM it significantly inhibited M. laxa in vivo. Caffeic and p-coumaric acids had significant inhibitory effects on lesion growth as well as on conidial germination and mycelial growth in vitro. Other compounds showed variable inhibitory effects on lesion growth but no significant effect on conidial germination. It is hypothesized that those compounds have different modes of action for their inhibitory effect, in relation with their chemical structure, which are differently affected by host genotype, infection state.
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