Terroir 2010 banner
IVES 9 IVES Conference Series 9 Comparison of the free radical-scavenging activity in infected oidium and sound dolcetto grape cultivar grown in a terroir of Central Italy

Comparison of the free radical-scavenging activity in infected oidium and sound dolcetto grape cultivar grown in a terroir of Central Italy

Abstract

The importance of polyphenols, which are present in many vegetables and grapes too, is well-know and documented. Specific research works about the red grape and its derivative juices and wines show that the antioxidant and/or antiradical activities are directly correlated with the complex polyphenol matrix. The content of polyphenols in grapes is clearly affected by agroecological factors: the cultivar, climatic condition, the effect of geographic origin of grapes, soil, chemistry, fertilization, and the degree of maturation. Aim of this work was value the radical-scavenging activity of polyphenols extract from skins and seeds of Dolcetto cultivar derived from infected Oidium grape and from the same sound grape. Infested Dolcetto grapes and sound Dolcetto grapes were grown in same terroir and with same training system (cordon spur).
The antiradical activity was determined by assay of free radical– 2,2 Diphenyl-1-picryl-hydrazyl (DPPH) method and total polyphenols content was determined by Folin – Ciocalteu method. Data show significant increase of total polyphenols both in skins and seeds from infected Oidium Dolcetto grape with respect to skin and seed total polyphenols from sound grape. To the contrary antioxidant activity calculated as value of ARP (1/EC50 P/D) in infected grape decreased significantly respecting sound grape. Therefore a possible relationship between the change composition of polyphenols in infected grapes and antioxidant property is suggested. While the antioxidant activity, calculated as micromoles of Trolox/g sample, increase in skins and seeds from infested Oidium grape with respect to skins e seeds from sound grape.

Download the PDF

DOI:

Publication date: December 3, 2021

Issue: Terroir 2010

Type: Article

Authors

F. Cecchini (1), B.Giannini (2)

(1) Researcher CRA Unità per le produzione enologiche dell’Italia Centrale via Cantina sperimentale,1 -00049
Velletri (Roma), Italy
(2) Biology student CRA Unità per le produzione enologiche dell’Italia Centrale via Cantina sperimentale, 1 – 00049 Velletri (Roma), Italy

Contact the author

Keywords

Skins, seeds, Oidium, antioxidant activity, polyphenols

Tags

IVES Conference Series | Terroir 2010

Citation

Related articles…

Talking about terroir

When talking about terroir, scientists and lay wine tasters, very much including wine journalists and wine growers, too often talk past one another.

Read More

AOC Saint-Romain, Hautes-Côtes-de-Beaune, Burgundy: analysis of a “terroir”

The abbreviation AOC designates, since 1905 in France, wines which characteristics and reputation are due to a proper “terroir”. The delimitation of such “terroirs” consists in a technical and statutory procedure which has developed by steps.

Read More

Effects of Silver Thiosulphate and Salicylic Acid on the long-term maintenance of the embryogenic callus of Vitis vinifera

New Plant Breeding Techniques (NPBTs) have the potential to revolutionize the genetic improvement of grapevine. However, the practical application of these techniques is limited by several challenges, such as the difficulty in generating embryogenic calluses, maintaining their competence during in vitro cultivation, and regenerating plants without defects. To overcome these challenges, we conducted a study to test the effect of two treatments on callus cultures derived from different grapevine varieties, with and without embryogenic competence. The tested substances were Silver Thiosulphate (STS) an ethylene inhibitor, and Salicylic Acid (SA), an elicitor with different effects depending on the concentration of use beyond the ethylene inhibitor activity.

Read More

Under trellis cover crop induces grapevine tolerance to bunch rot

Botrytis bunch rot occurrence is one of the most important limitations for the wine industry in humid environments. A positive correlation between grapevine growth and susceptibility to fungal pathogens has been found. In theory the effect of grapevine vegetative growth on bunch rot expression results from direct effects (cluster architecture, nitrogen status among others) and indirect ones (via microclimate). However, a reduction in bunch rot incidence can be achieved in some circumstances without major vine growth reduction. The present study was aimed to test the general hypothesis that bunch rot susceptibility is affected by vine vigor, but other factors associated with grapevine vegetative expression could be even more relevant.

Read More

Stomatal restrictions to photosynthesis in grapevine cultivars grown in a semiarid environment

Diurnal changes in the leaves of field-grown grapevine (Vitis vinifera L.) cultivars Syrah and Tempranillo were followed over summer 2009 with respect to gas exchanges. Net photosynthetic rate (AN) of both cultivars rapidly increased in the morning, decreasing slowly until the late afternoon, when reached the lowest values.

Read More