New bacterial agents to limit Colletotrichum gloeosporioides development on mango

Taibi Ahmed, Meile Jean-Christophe, Dieudonné Hugo, Korsten Lise, Chillet Marc, Remize Fabienne. 2020. New bacterial agents to limit Colletotrichum gloeosporioides development on mango. Advances in Microbiology, 10 (12) : 691-712.

Résumé : Mango anthracnose disease forms typical irregular-shaped black necrotic spots on the fruit peel of mature fruit and is caused by Colletotrichum gloeosporioides. In order to improve the disease control with a limited use of fungicides, new microbial agents able to limit the growth of the pathogen were searched in the indigenous natural flora of mango surface. In order to find a suitable biocontrol agent, a screening was applied to 305 epiphytic bacteria isolated from the carposphere of 17 mango cultivars sampled from eight locations on Reunion Island. The screening approach involved a first step based on the ability of the isolates to form a biofilm, to grow under fruit storage conditions, and to interfere with the development of C. gloeosporioides. In a second step, the capability of selected isolates to limit C. gloeosporioides in vitro mycelial growth and conidia germination was assessed and species identified. The most effective bacteria belonged to the Enterobacter, Pantoea, Kosakonia and Leuconostoc genera, but for some of them, their safe use has to be demonstrated. Efficacy in vivo, performed on wounded mature mango fruit, was limited, probably because of the wounding inoculation strategy favoring the pathogen. Future biocontrol treatments should focus on preharvest applications to enhance the protective benefit.

Mots-clés Agrovoc : anthracnose, Glomerella cingulata, Mangifera indica, agent de lutte biologique, maladie des plantes, lutte biologique, lutte après récolte, lutte biologique contre les maladies

Mots-clés géographiques Agrovoc : La Réunion, France

Mots-clés complémentaires : Colletotrichum gloeosporioides, bactérie épiphyte

Mots-clés libres : Anthracnose, Epiphytic Bacteria, Antagonism

Classification Agris : H01 - Protection des végétaux - Considérations générales
H20 - Maladies des plantes
Q02 - Traitement et conservation des produits alimentaires
J11 - Manutention, transport, stockage et conservation des produits d'origine végétale

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

Auteurs et affiliations

• Taibi Ahmed, CIRAD-PERSYST-UMR Qualisud (REU)
• Meile Jean-Christophe, CIRAD-PERSYST-UMR Qualisud (REU) ORCID: 0000-0002-6747-2104 - auteur correspondant
• Dieudonné Hugo, Université de Montpellier (FRA)
• Korsten Lise, University of Pretoria (ZAF)
• Chillet Marc, CIRAD-PERSYST-UMR Qualisud (REU)
• Remize Fabienne, Université de la Réunion (REU)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/597315/)

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