Pathotyping citrus ornamental relatives with Xanthomonas citri pv. citri and X. citri pv. aurantifolii refines our understanding of their susceptibility to these pathogens
2022
Licciardello, Grazia | Caruso, Paola | Bella, Patrizia | Boyer, Claudine | Smith, Malcolm W. | Pruvost, Olivier | Robène, Isabelle | Cubero, Jaime | Catara, Vittoria | Università degli studi di Catania = University of Catania (Unict) | Consiglio per la Ricerca in Agricoltura e l’analisi dell’economia agraria = Council for Agricultural Research and Economics (CREA) | Università degli studi di Palermo | Peuplements végétaux et bioagresseurs en milieu tropical (UMR PVBMT) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Université de La Réunion (UR)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Bundaberg Research Station | Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria (INIA [Espagne]) | European Commission;EC;UE;http://dx.doi.org/10.13039/501100000780 | European Project: 618127,EC:FP7:KBBE,FP7-ERANET-2013-RTD,ARIMNET2(2014)
Source Agritrop Cirad (https://agritrop.cirad.fr/601037/)
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Afficher plus [+] Moins [-]anglais. Xanthomonas citri pv. citri (Xcc) and X. citri pv. aurantifolii (Xca) are causal agents of Citrus Bacterial Canker (CBC), a devastating disease that severely affects citrus plants. They are harmful organisms not reported in Europe or the Mediterranean Basin. Host plants are in the Rutaceae family, including the genera Citrus, Poncirus, and Fortunella, and their hybrids. In addition, other genera of ornamental interest are reported as susceptible, but results are not uniform and sometimes incongruent. We evaluated the susceptibility of 32 ornamental accessions of the Rutaceae family belonging to the genera Citrus, Fortunella, Atalantia, Clausena, Eremocitrus, Glycosmis, Microcitrus, Murraya, Casimiroa, Calodendrum, and Aegle, and three hybrids to seven strains of Xcc and Xca. Pathotyping evaluation was assessed by scoring the symptomatic reactions on detached leaves. High variability in symptoms and bacterial population was shown among the different strains in the different hosts, indicative of complex host–pathogen interactions. The results are mostly consistent with past findings, with the few discrepancies probably due to our more complete experimental approach using multiple strains of the pathogen and multiple hosts. Our work supports the need to regulate non-citrus Rutaceae plant introductions into areas, like the EU and Mediterranean, that are currently free of this economically important pathogen.
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