 IVES 9 IVES Conference Series 9 Macrowine 9 Macrowine 2021 9 Grapevine diversity and viticultural practices for sustainable grape growing 9 Application of treatments to delay the ripening of grape varieties cultivated in valpolicella

Application of treatments to delay the ripening of grape varieties cultivated in valpolicella

Abstract

AIM: Winegrape cultivars are particularly sensitive to temperature and recent changes in climate have advanced the onset of berry ripening, resulting in unbalanced fruit composition at harvest. High temperatures during ripening result in berries with increased sugar concentration, reduced acidity and colour and unwanted or underdeveloped aroma compounds. To reduce the negative effects of climate change, several adaptation strategies, represented especially by viticultural practices, have been proposed. In this work we tested and compared the effect of two different treatments aimed to delay ripening of the most important grape varieties cultivated in Valpolicella (Verona, Italy).

METHODS: Clusters of Corvina and Corvinone, cultivated in Valpolicella, cordon trained, cane pruned, were treated one week before veraison with 1-Naphthaleneacetic acid (NAA), a synthetic auxin. On another block of vines of the same cultivars in the same vineyard, a postveraison defoliation treatment was applied, with the effect of removing about 30-40% of the leaves thus creating a vertical window without leaves above the bunch area. The dynamic of the main ripening parameters was monitored over the course of maturation and yield and yield components were determined at harvest.

RESULTS:Leaf removal had a very limited effect on delaying the accumulation of sugars in berries, which was the main scope of the trial, compared to berries from untreated vines. On the other hand, the NAA treatment greatly impacted the ripening dynamic of both varieties, postponing the accumulation of sugars and anthocyanins and the decrease in acidity. The effect was more pronounced in Corvinone than in Corvina.

CONCLUSIONS

The results evidenced that a relevant delay of ripening time can be obtained by treating clusters of the main grape varieties cultivated in Valpolicella with auxin-based products. On the contrary, the leaf defoliation treatment only weakly affected the ripening dynamics, possibly due to the remobilization of reserves from the perennial organs of the plant.

DOI:

Publication date: September 2, 2021

Issue: Macrowine 2021

Type: Article

Authors

Giovanni Battista Tornielli

University of Verona, Ron SHMULEVIZ, University of Verona

Contact the author

Keywords

climate change, valpolicella, ripening, auxin, defoliation

Citation

Using unmanned aerial vehicle with multispectral camara to efficiently and precisely monitor the incidence of downy mildew and technical maturity of beibinghong (vitis amurensis Rpru.) grapes

Multispectral unmanned aerial vehicle (UAV) has been successfully applied in monitoring vine vegetative growth, however, there are still potential relationships between remote sensing vegetation indexes (vis) and vine condition or grape quality, so it is worthy a deeper investigation to make a better use of UAV. One of the purposes of the study is to find out vis that could denote the severity of downy mildew (DM), so that precise and differentiated control strategies would be adopted subsequently.

A.O.C. huile d’olive de Nyons et olives noires de Nyons

Application of an in vitro digestion model to study the bioaccessibility and the effect of the intestinal microbiota on the red wine proanthocyanidins

Proanthocyanidins are important phenolic fraction for wine quality, contributing to astringency, bitterness and color. Their metabolism begins in the mouth and continues throughout the gastrointestinal tract; however, most of them are accumulated in the colon where are metabolized by the intestinal microbiota, giving rise to a whole series of phenolic acids that may have greater activity at physiological level than the precursors[1]. This study aimed to evaluate in vitro the bioaccessibility of proanthocyanidins in a red wine developed by Bodegas Pradorey, as well as to evaluate the potential effect of intestinal microbiota on polyphenols metabolism identifying and quantifying secondary metabolites.

Effect of the plant sink/source balance on the chemical content of red table grapes (Vitis vinifera L.).

PPhloem transport of assimilates provides the materials needed for the growth and development of reproductive structures, storage and developing organs, and has long been recognized as a major determinant in crop yield.

Subsurface irrigation: a means to reduce chemical and water inputs in vineyards

Grape growers around the world are seeking to reduce their reliance on herbicides. However, traditional alternatives to chemical weed control do not always integrate seamlessly into established vineyard operations. Employing nonchemical weed management often requires trellis alterations, purchasing or hiring new equipment, and depending on region, may significantly increase tractor passes required to reach desired level of weed control. Critical thinking and thoughtful strategies are necessary to minimize expenditures and maintain quality during the transition away from herbicides. In this trial, irrigation was installed underground in an effort to minimize water loss due to evaporation, better direct the water to the vines, and reduce weed growth in the difficult to control undervine area.