Abstract 

Introduction – Fruitlet core rot is the major postharvest disease affecting ‘Queen’ pineapple in La Réunion island. The symptoms are black spots located in the pineapple fruitlets. Materials and methods – Fusarium ananatum, the main causal agent of fruitlet core rot was inoculated in ‘MD-2’ and ‘Queen’ (Victoria), a tolerant and a susceptible cultivar, respectively. A metabolomics approach to healthy and inoculated fruitlets allowed to determine which putative metabolites are involved in fruitlet core rot disease. The evolution of fruitlet core rot was then followed-up with a focus on the phenolic compounds. Results and discussion – Based on the metabolomics results, the phenolic compounds seemed to be determining markers of black spots. Coumaroylisocitrate and caffeoylisocitrate dramatically increased in the infected fruitlets in both cultivars post-inoculation. The ‘MD-2’-infected fruitlets reached higher hydroxycinnamic acid levels in a shorter time than those of the ‘Queen’-infected fruitlets. In healthy fruits of ‘MD-2’, coumaroyl-isocitric acid and hydroxybenzoic acids were naturally produced as the fruit mature. Conclusion – These phenolic compounds play a major role in the pineapple disease resistance.

Référence : B. Barral 1, M. Chillet 1, M. Léchaudel 2, R. Lugan 3 and S. Schorr-Galindo 4, Fruits 74 (1) 11-17, © ISHS 2019. 
1 CIRAD, UMR Qualisud, Réunion, France
2 CIRAD, UMR Qualisud, Guadeloupe, France.
3 UMR Qualisud, Université d’Avignon, France 
4 UMR Qualisud, Université de Montpellier, France

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DOI: 10.17660/th2019/74.1.2