We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
P43 -Can nitrogen nutrition affect the grapevine resistance to downy mildew?
- Authors
Ricciardi, Valentina; Marcianò, Demetrio; Massafra, Annamaria; Maddalena, Giuliana; Marone Fassolo, Elena; Masiero, Simona; Failla, Osvaldo; De Lorenzis, Gabriella; Toffolatti, Silvia Laura
- Abstract
Downy mildew (caused by Plasmopara viticola) is a disease that strongly affect grapevine. To date, the use of fungicide is still the most effective way to prevent the spreading of the pathogen. However, concerns about the safety and the environmental impact of the fungicides make the search of new solutions an urgent problem. Nitrogen nutrition can be one of this. Indeed, P. viticola, that lack of some nitrogen related pathways, can take advantage of plant nitrogen. In this work, we hypothesized that P. viticola could suffer the absence of nitrogen, making the susceptible Pinot Noir cultivar less susceptible to the pathogen. Pinot noir plants were grown in hydroponic solutions with five different nitrogen concentrations (0, 0.05, 1, 2 and 5 mM) and leaf nitrogen content, photosynthetic performance, P. viticola sporulation and gene expression of four nitrogen-related genes (VvLBDIc3, VvLBDIf5, VvLBDIIa3 and VvLBDIIb2) were estimated at three different time points. Leaf nitrogen content, photosynthetic performance and disease severity were reduced at the 0 mM treatment. Nitrogen treatments modulated the expression of genes analysed. VvLBDIc3, VvLBDIf5 and VvLBDIIa3 were overexpressed at low nitrogen concentrations, suggesting a role during nitrogen starvation. While, VvLBDIIb2 was underexpressed at low nitrogen concentrations. A correlation between disease severity and gene espression has been highlighted. These data demonstrated that decrease in nitrogen content can have a positive impact on the incidence of downy mildew, stressing the importance to manage the vineyard nitrogen nutritional status and suggesting an appropriate use of fertilizers, with a beneficial impact for environment and human health.
- Subjects
DOWNY mildew diseases; GRAPES; PINOT noir; NITROGEN; NUTRITION; NUTRITIONAL status; STARVATION
- Publication
Julius-Kühn-Archiv, 2022, Issue 470, p125
- ISSN
1868-9892
- Publication type
Article