Severe modifications in source-sink ratio influence the susceptibility of bananas to crown rot and its phenolic content

Ewané Cécile Annie, Nott Katherine, Lassois Ludivine, Lepoivre Philippe, De Lapeyre de Bellaire Luc. 2020. Severe modifications in source-sink ratio influence the susceptibility of bananas to crown rot and its phenolic content. Plant Pathology, 69 (9) : 1740-1753.

Quartile : Q2, Sujet : AGRONOMY / Quartile : Q2, Sujet : PLANT SCIENCES

Résumé : Banana susceptibility to crown rot is influenced by many biotic and abiotic preharvest factors, which include source‐sink (So‐Si) ratio modifications through trimming of leaves and fruit. Banana plant's resistance to biotic stress has been previously correlated to its phenolic content; it is hypothesized that the crown's phenolic content may influence the fruit's susceptibility. The aim of this work was to investigate the influence of severe So‐Si ratio modifications, via the removal of leaves and fruit, and the involvement of phenolics in the fruit's susceptibility to crown rot. Fruit susceptibility was evaluated 13 days postinoculation (13 dpi) with Colletotrichum musae. Banana crowns obtained on the day of harvest before inoculation (dhbi) and 13 dpi were analysed for changes in phenolics using GC‐MS, HPLC, and LC‐MS devices. Severe So‐Si ratio modifications had a significant effect (p <.001) on susceptibility, fruits of low So‐Si ratio being most susceptible. It also significantly influenced (p < .001) some tree and fruit characteristics. The less susceptible (S−) crowns had higher amounts of phenolics compared to the more susceptible (S+) ones. Catecholamines were identified as the major phenolics in banana crown, notably dopamine compared to norepinephrine and normetanephrine. Hydroxycinnamic acids (ferulic acid and its derivatives) were significantly accumulated (p <.001) the dhbi in S− crowns compared to S+ crowns, but decreased 13 dpi. Phenolics have a possible role in the biochemical defence of banana crown and could be used by producers as a chemical criterion for estimation of the level of banana's susceptibility to crown rot.

Mots-clés Agrovoc : relation source puits, Musa (bananes), HPLC, pourriture, résistance aux maladies, teneur en phénols, stress biotique, résistance physiologique au stress

Mots-clés complémentaires : Pourriture du collet, Colletotrichum musae

Mots-clés libres : Chromatographic methods (GC-MS, HPLC, LC-MS), Crown rot, Fruit susceptibility, Musa spp., Phenolic, Source-sink ratio modifications

Classification Agris : H20 - Maladies des plantes
F60 - Physiologie et biochimie végétale
F40 - Écologie végétale

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

• Ewané Cécile Annie, GxABT (BEL) - auteur correspondant
• Nott Katherine, GxABT (BEL)
• Lassois Ludivine, GxABT (BEL)
• Lepoivre Philippe, GxABT (BEL)
• De Lapeyre de Bellaire Luc, CIRAD-PERSYST-UPR Systèmes bananes et ananas (FRA) ORCID: 0000-0003-1243-0887

Source : Cirad-Agritrop (https://agritrop.cirad.fr/597305/)

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