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Coumaroyl-isocitric and caffeoyl-isocitric acids as markers of pineapple fruitlet core rot disease

Barral B., Chillet M., Lechaudel M., Lugan R., Schorr-Galindo S.. 2019. Fruits, 74 (1) : p. 11-17.

DOI: 10.17660/th2019/74.1.2

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.

Mots-clés : ananas comosus; fusarium; composé phénolique; résistance aux maladies; métabolite; réunion; france; fusarium ananatum

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