title: A method to detect and quantify Phaeomoniella chlamydospora and Phaeoacremonium aleophilum DNA in grapevine-wood samples.
abstract: Grapevines are sensitive to a wide range of fungal pathogens, including agents such as Phaeomoniella chlamydospora and Phaeoacremonium aleophilum that cause tracheomycosis. In the present study, a procedure for DNA extraction from grapevine woody tissue is first evaluated and shown to be suitable for quantitative analysis. Next, a multiplex real-time PCR method targeting the β-tubulin gene of the pathogens and the actin gene of plant material is developed and its quantitative capability is verified. This protocol was evaluated in inoculated grapevine-wood samples and in young vines from a nursery and was found to be reliable and highly specific. Results obtained from inoculated cuttings show that the fungal colonization process must be considered regardless of the wood phenotype. An analysis of samples of young vines from the nursery shows that a high rate of contamination occurs at the basis of plants and that this contamination is associated with low quantitative values. This finding provides evidence that in vine nurseries, these fungi may be efficient soil-borne pathogens.
authors.affiliation: Loire Viti Vini Distribution (LVVD), Z.A du Landreau, 49610, Mozé sur Louet, France.
authors.forename: Jérôme
authors.initials: J
authors.lastname: Pouzoulet
authors.forename: Nathalie
authors.initials: N
authors.lastname: Mailhac
authors.forename: Christel
authors.initials: C
authors.lastname: Couderc
authors.forename: Xavier
authors.initials: X
authors.lastname: Besson
authors.forename: Jean
authors.initials: J
authors.lastname: Daydé
authors.forename: Marie
authors.initials: M
authors.lastname: Lummerzheim
authors.forename: Alban
authors.initials: A
authors.lastname: Jacques
mesh_terms: D001203:Ascomycota / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D017931:DNA Primers / Q000235:genetics; D004271:DNA, Fungal / Q000235:genetics*; D010935:Plant Diseases / Q000382:microbiology*; D016133:Polymerase Chain Reaction / Q000379:methods*; D027843:Vitis / Q000382:microbiology*; D014934:Wood / Q000382:microbiology*
chemical_list: D017931:DNA Primers; D004271:DNA, Fungal