Natural Infection of Cashew (Anacardium occidentale) by Xanthomonas citri pv. mangiferaeindicae in Burkina Faso

Zombré C., Sankara Philippe, Ouédraogo Souleymane, Wonni Issa, Boyer Karine, Boyer Claudine, Terville Marie Annabelle, Javegny Stéphanie, Allibert Agathe, Vernière Christian, Pruvost Olivier. 2016. Natural Infection of Cashew (Anacardium occidentale) by Xanthomonas citri pv. mangiferaeindicae in Burkina Faso. Plant Disease, 100 (4) : 718-723.

https://doi.org/10.1094/PDIS-10-15-1137-RE

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Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : Xanthomonas citri pv. mangiferaeindicae is the causal agent of bacterial canker of mango ( Mangifera indica , Anacardiaceae), a disease of inter- national importance. Since the original description of the bacterium in the 1940s, the status of cashew ( Anacardium occidentale , Anacardia- ceae) as a host species has been unclear. Here, we report the first outbreak of a cashew bacterial disease in Burkina Faso (Western Africa) where X. citri pv. mangiferaeindicae recentlyemergedon mango. A comprehen- sive molecular characterization, based on multilocus sequence analysis, supplemented with pathogenicity assays of isolates obtained during the outbreak, indicated that the causal agent on cashew in Burkina Faso is X. citri pv. mangiferaeindicae and not X. citri pv. anacardii , which was previously reported as the causal agent of a cashew bacterial leaf spot in Brazil. Pathogenicity data supported by population biology in Burkina Faso suggest a lack of host specialization. Therefore, the inoculum from each crop is potentially harmful to both host species. Symptoms induced on cashew leaves and fruit by X. citri pv. mangiferaeindicae and nonpig- mented strains of X. citri pv. anacardii are similar, although the causative bacteria are genetically different. Thus, xanthomonads pathogenic on cashew may represent a new example of pathological convergence in this bacterial genus.

Mots-clés Agrovoc : Anacardium occidentale, Xanthomonas campestris citri, Mangifera indica, identification, pathotype, symptome

Mots-clés géographiques Agrovoc : Burkina Faso

Mots-clés complémentaires : Xanthomonas citri pv mangiferaeindicae, Xanthomonas citri pv. anacardii, Émergence

Classification Agris : H20 - Maladies des plantes

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

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