Valutazione del diverso grado di tolleranza di varietà di Vitis vinifera tradizionalmente coltivate in Italia Centralea Plasmopara viticola ed Erysiphe necator
Author(s)
Paolocci, Marco
Date Issued
May 24, 2012
Type
Doctoral Thesis
Abstract
The attention for environmental safety and the wide market requirement of wines able to express
territory characteristics, increased the interest of researchers and viticulturist for local grape
varieties. Vitis vinifera local germplasm can includes minor varieties which characteristics are often
unknown with respect to genetic profile, viticultural and enological potential and level of resistance
to biotic stresses, particularly respect the widespread fungal pathogens downy mildew (Plasmopara
viticola) and powdery mildew (Erysiphe necator). The aim of this study was to characterize the
susceptibility to downy and powdery mildew of five grape varieties belonging to the enological
tradition of central Italy. Morphological features of leaf were analysed in the different varieties as
possible natural defence mechanisms. Field observations and laboratory experiments on leaf disks
and detached leaves were carried out to analyse the different susceptibility to the diseases.
Epifluorescence microscopy was applied to study pathogens growth on leaf tissues and the content
of stilbenes was assessed by HPLC in P. viticola inoculated leaves.
Results showed significant differences among grape varieties with respect to susceptibility to P.
viticola and E. necator. Trebbiano giallo and Romanesco varieties showed lower susceptibility to
the pathogens compared to Aleatico and Canaiolo nero. Epifluorescence technique allowed us to
determine differences among varieties with respect to the primary developmental stages of pathogen
infections.
Additional information
Dottorato di ricerca in Ortoflorofrutticoltura
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