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.

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…

First identification of a glycosylated fraction involved in mushroom-off-flavor in grapes: influence of B. cinerea, powdery mildew and C. subabruptus

An organoleptic defect, called fresh mushrooms off-flavor, appeared in wines and spirits since the 2000’s. Numerous researches demonstrated that octen-3-one, octan-3-ol and octen-3-ol

Biomass carbon and nitrogen input from cover crops in an irrigated vineyard in Okanagan Valley, Canada

The use of cover crops in vineyards has been encouraged by positive effects on wine grape yield and sensory attributes, and improved soil function. This study examined the efficacy of three alleyway and three undervine cover crop treatments in an organic vineyard in the semiarid Okanagan Valley, Canada in 2021.

Towards a regional mapping of vine water status based on crowdsourcing observations

Monitoring vine water status is a major challenge for vineyard management because it influences both yield and harvest quality. It is also a challenge at the territorial scale for identifying periods of high water restriction or zones regularly impacted by water stress. This information is of major importance for defining collective strategies, anticipating harvest logistic or applying for irrigation authorisation. At this spatial scale, existing tools and methods for monitoring vine water status are few and often require strong assumptions (e.g. water balance model). This paper proposes to consider a collaborative collection of observations by winegrowers and wine industry stakeholders (crowdsourcing) as an interesting alternative. Indeed, it allows the collection of a large number of field observations while pooling the collection effort. However, the feasibility of such a project and its interest in monitoring vine water status at regional scale has never been tested.

The objective of this article is to explore the possibility of making a regional map of vine water status based on crowdsourcing observations. It is based on the study of the free mobile application ApeX-Vigne, which allows the collection of observations about vine shoot growth. This information is easy to collect and can be considered, under certain conditions, as a proxy for vine water status. This article presents the first results obtained from the nearly 18,000 observations collected by winegrowers and wine industry stakeholders during 2019, 2020 and 2021 seasons. It presents the vine shoot growth maps obtained at regional scale and their evolution over the three vintages studied. It also proposes an analysis of the factors that favoured the number of observations collected and those that favoured their quality. These results open up new perspectives for monitoring vine water status at a regional scale but above they provide references for other crowdsourcing projects in viticulture.

The impact of delayed grapevine budbreak on lemberger wine sensory compounds under variable weather conditions

Spring freeze events threaten grape production globally. As grape buds emerge from dormancy in spring, freezing temperatures have the potential to damage green tissues, decreasing yield potential and compromising fruit quality by harvest.

Identifying best parameters to characterize genotypes capability of retaining adequate malic acid at harvest and in final wines

Under current climate change pressures, obtaining grapes with adequate acidity at harvest is one of the main challenges for growers, especially if the goal is producing sparkling wines. This issue arises from two main occurrences: i) higher temperatures enhance degradation of malic acid; ii) grape maturity may occur under suboptimal climatic conditions due to an advanced phenology.