title: Contrasting Susceptibilities to Flavescence Dorée inVitis vinifera, Rootstocks and WildVitisSpecies.
abstract: Flavescence dorée (FD) is a quarantine disease of grapevine, involving interactions between the plants, leafhopper vectors, and FD phytoplasma. Characterizing the susceptibility of vine varieties could limit disease propagation. After extensive surveys in vineyards, we showed that Cabernet Sauvignon (CS) is highly susceptible, with a high proportion of symptomatic branches and phytoplasma titers, in contrast to Merlot (M). Localized insect transmissions and grafting showed that phytoplasma circulate in the whole plant in the CS cultivar, but in M they are restricted to the transmission point. Insect-mediated transmission under high confinement mimicking natural conditions confirmed these phenotypes and allowed the classification of 28Vitisaccessions into three distinct categories, according to the percentage of infected plants and their phytoplasma titers. Reduced symptoms, low phytoplasma titers, and low percentages of infected plants were found to be associated in theVitis viniferacultivars tested. Interestingly, the low susceptibility of M was observed for one of its parents, i.e., Magdeleine Noire des Charentes. Rootstocks and theirVitisparents, although having high percentages of infected plants and intermediate to high phytoplasma titers, shared a symptomless response. This is troubling, because rootstocks can constitute a silent reservoir of contamination in mother plants or when they grow wild nearby vineyards. Altogether, data suggest distribution of genetic traits within theVitisgenus involved in insect-mediated phytoplasma transmission, multiplication, circulation, and symptom development.
authors.affiliation: UMR 1332 Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Université de Bordeaux Villenave-d'Ornon, France.
authors.forename: Sandrine
authors.initials: S
authors.lastname: Eveillard
authors.affiliation: UMR 1332 Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Université de Bordeaux Villenave-d'Ornon, France.
authors.forename: Camille
authors.initials: C
authors.lastname: Jollard
authors.affiliation: UMR 1332 Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Université de Bordeaux Villenave-d'Ornon, France.
authors.forename: Fabien
authors.initials: F
authors.lastname: Labroussaa
authors.affiliation: UMR 1332 Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Université de Bordeaux Villenave-d'Ornon, France.
authors.forename: Dima
authors.initials: D
authors.lastname: Khalil
authors.affiliation: UMR 1131 Santé de la Vigne et Qualité du Vin, Institut National de la Recherche Agronomique, Université de Strasbourg Colmar, France.
authors.forename: Mireille
authors.initials: M
authors.lastname: Perrin
authors.affiliation: UMR 1332 Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Université de Bordeaux Villenave-d'Ornon, France.
authors.forename: Delphine
authors.initials: D
authors.lastname: Desqué
authors.affiliation: UMR 1332 Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Université de Bordeaux Villenave-d'Ornon, France.
authors.forename: Pascal
authors.initials: P
authors.lastname: Salar
authors.affiliation: UMR 1332 Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Université de Bordeaux Villenave-d'Ornon, France.
authors.forename: Frédérique
authors.initials: F
authors.lastname: Razan
authors.affiliation: UMR 1287 Ecophysiologie et Génomique Fonctionnelle de la Vigne, Institut National de la Recherche Agronomique, Université de Bordeaux Villenave-d'Ornon, France.
authors.forename: Cyril
authors.initials: C
authors.lastname: Hévin
authors.affiliation: UMR 1287 Ecophysiologie et Génomique Fonctionnelle de la Vigne, Institut National de la Recherche Agronomique, Université de Bordeaux Villenave-d'Ornon, France.
authors.forename: Louis
authors.initials: L
authors.lastname: Bordenave
authors.affiliation: UMR 1332 Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Université de Bordeaux Villenave-d'Ornon, France.
authors.forename: Xavier
authors.initials: X
authors.lastname: Foissac
authors.affiliation: UMR 1131 Santé de la Vigne et Qualité du Vin, Institut National de la Recherche Agronomique, Université de Strasbourg Colmar, France.
authors.forename: Jean E
authors.initials: JE
authors.lastname: Masson
authors.affiliation: UMR 1332 Biologie du Fruit et Pathologie, Institut National de la Recherche Agronomique, Université de Bordeaux Villenave-d'Ornon, France.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Malembic-Maher
keywords: Scaphoideus titanus; genetic traits; grapevine; phytoplasma; symptoms; transmission