Specificity of Resistance and Tolerance to Cucumber Vein Yellowing Virus in Melon Accessions and Resistance Breaking with a Single Mutation in VPg
Desbiez, Cecile (Institut national de recherche pour l'agriculture, l'alimentation et l'environnement)
Domingo Calap, María Luisa (Centre de Recerca en Agrigenòmica)
Pitrat, Michel (Institut national de recherche pour l'agriculture, l'alimentation et l'environnement)
Wipf-Scheibel, Catherine (Institut national de recherche pour l'agriculture, l'alimentation et l'environnement)
Girardot, Grégory (Institut national de recherche pour l'agriculture, l'alimentation et l'environnement)
Ferriol, Inmaculada (Centre de Recerca en Agrigenòmica)
Lopez-Moya, Juan Jose (Centre de Recerca en Agrigenòmica)
Lecoq, Hervé (Institut national de recherche pour l'agriculture, l'alimentation et l'environnement)

Data:	2022
Resum:	Cucumber vein yellowing virus (CVYV) is an emerging virus on cucurbits in the Mediterranean Basin, against which few resistance sources are available, particularly in melon. The melon accession PI 164323 displays complete resistance to isolate CVYV-Esp, and accession HSD 2458 presents a tolerance, i. e. , very mild symptoms despite virus accumulation in inoculated plants. The resistance is controlled by a dominant allele Cvy-11, while the tolerance is controlled by a recessive allele cvy-2, independent from Cvy-11. Before introducing the resistance or tolerance in commercial cultivars through a long breeding process, it is important to estimate their specificity and durability. Upon inoculation with eight molecularly diverse CVYV isolates, the resistance was found to be isolate-specific because many CVYV isolates induced necrosis on PI 164323, whereas the tolerance presented a broader range. A resistance-breaking isolate inducing severe mosaic on PI 164323 was obtained. This isolate differed from the parental strain by a single amino acid change in the VPg coding region. An infectious CVYV cDNA clone was obtained, and the effect of the mutation in the VPg cistron on resistance to PI 164323 was confirmed by reverse genetics. This represents the first determinant for resistance-breaking in an ipomovirus. Our results indicate that the use of the Cvy-11 allele alone will not provide durable resistance to CVYV and that, if used in the field, it should be combined with other control methods such as cultural practices and pyramiding of resistance genes to achieve long-lasting resistance against CVYV.
Ajuts:	Ministerio de Economía y Competitividad AGL2016-75529-R Agencia Estatal de Investigación PID2019-105692RB-I00 Ministerio de Economía y Competitividad SEV-2015-0533 Agencia Estatal de Investigación CEX2019-000902-S
Nota:	Altres ajuts: CERCA Programme/Generalitat de Catalunya
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Disease control and pest management ; Disease resistance ; Ecology and epidemiology ; Evolution ; Fitness ; Infectious clone ; Ipomovirus ; Resistance-breaking ; Tolerance ; Virology ; VPg
Publicat a:	Phytopathology, Vol. 112, Num. 5 (April 2022) , p. 1185-1191, ISSN 0031-949X

DOI: 10.1094/PHYTO-06-21-0263-R

Postprint 32 p, 2.4 MB

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