Histological and ultrastructural characterization of coffee resistance to Colletotrichum kahawae : [PB659]

Loureiro Andreia A., Silva M.D.C., Varzea Victor, Moncada P., Bertrand Benoît, Nicole Michel. 2008. Histological and ultrastructural characterization of coffee resistance to Colletotrichum kahawae : [PB659]. In : 22nd International Conference on Coffee Science. ASIC. Montpellier : ASIC, 1040-1044. ISBN 2-900212-21-9 International Conference on Coffee Science. 22, Campinas, Brésil, 14 Septembre 2008/19 Septembre 2008.

https://www.asic-cafe.org/conference/22nd-international-conference-coffee-science

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Résumé : The growth of Colletotrichum kahawae Waller and Bridge and the early responses it induced in hypocotyls with different levels of resistance were investigated by light and transmission electron microscopy. Fungal penetration occurred through melanized appressoria directly into the epidermal cell walls with formation of an infection vesicle. Plant susceptibility involved the intra- and intercellular ramification of the infection vesicle in the living host cells. This brief period of biotrophy was followed by the necrotrophic fungal growth and the production of symptoms (dark sunken lesions with sporulation). In the necrotrophic phase, colonization of host cells by the fungus was associated with severe walls alterations and death of the host protoplasts. The more resistant genotypes were characterized by a restricted fungal growth associated with hypersensitive-like host cell death, modifications in the cell walls (thickness and autofluorescence) and early accumulation of phenolic compounds, such as flavonoides and hydroxycinnamic acid derivatives.

Mots-clés Agrovoc : Coffea arabica, Colletotrichum

Mots-clés complémentaires : Colletotrichum kahawae

Classification Agris : H20 - Maladies des plantes
F30 - Génétique et amélioration des plantes

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