1 research outputs found
Foliar application of yeast derivatives at veraison to grapevines and their effects on the chemical composition. A bibliographic review
Mestrado em Engenharia de Viticultura e Enologia / Instituto Superior de Agronomia. Universidade de Lisboa / Faculdade de CiĆŖncias. Universidade do PortoThe present work was aimed to elaborate a bibliographic review about the importance
and effects, in a viticultural and enological point of view, of a new and innovating product, the
LalVigneĆ¢, that consists in inactive dry yeast (Saccharomyces cerevisiae) derivatives. It was
discussed the ongoing challenges of climate change in wine industry, as the alterations of
flowering, veraison and harvest, emphasizing the changes in the ripening process, the
metabolism of the vine and also at sensorial level. It was referred in this work, some adaptation
measures, being the application of LalVigneĆ¢ the most important and the one which was
developed throughout the work.
Elicitation topic went deeper, being referred what elicitor is and its mode of action.
Bridging the gap between elicitors and its mode of action in vines, it was possible to develop
the work about LalVigneĆ¢. The LalVigneĆ¢ is an elicitor, consisting in inactive dry yeast
derivatives, with foliar application. The characteristics of LalVigneĆ¢, itās mode of action, the
advantages and disadvantages for viticulture and enology, as well as their side effects, were
described.
There are two types of LalVigneĆ¢, Mature and Aroma, whose application is made in
red and white grapes, respectively. Regarding the side effects, the use of LalVigneĆ¢ AROMA
had: improvements in the skin thickness; developments in the aroma precursors; no impact in
berry weight, Brix, pH or Tartaric acid; enhancements in the glutathione concentration;
increases in thiolic varieties as 3MH and 3MHA; and reduction of herbaceous or aggressive
character. The use of LalVigneĆ¢ MATURE had: improvements in the skin thickness; no impact
in berry weight, Brix, pH or tartaric acid; a reduction of herbaceous or aggressive character;
improvements in the concentration of extractable anthocyanins; improvements in the skin
tannins; and developments in the degree of polymerization. Several trials were compared in
this regardN/