Terroir 2014 banner
IVES 9 IVES Conference Series 9 International Terroir Conferences 9 Terroir 2014 9 Grape growing soils, topographic diversity 9 Temperature effects on the biosynthesis of aroma compounds in glera grapes

Temperature effects on the biosynthesis of aroma compounds in glera grapes

Abstract

This paper describes the first year results of a study that investigated the effects of altitude and related temperature parameters on the biosynthesis of aromas in the Italian cultivar Glera. 

The trial was carried out in a commercial vineyard planted on a steep slope in the Valdobbiadene area (North-East of Italy). Three sites were selected at three different altitudes, ranging from 200 m a.s.l. to 380 m a.s.l. In each site air and berry temperature were constantly monitored during the ripening period. Starting from veraisón, grape samples were collected from each site approximately every 10 days, and then analyzed to determine the ripening level (soluble solids, acidity, pH), the amount of aroma volatile compounds and the expression of some key genes involved in the terpenoid biosynthesis. 

Preliminary data collected in 2012 highlighted the strong influence that altitude exerts on both air temperature and fruit temperature during the ripening period. The lowest site recorded the lowest minimum night temperatures, about 2°C lower than the medium and high sites, and consequently the grape ripening in this site was notably delayed compared to the medium and high sites. A similar delay was not observed in the synthesis of aroma compounds. At harvesting, the three principal classes of compounds (terpenes, norisoprenoids and benzenoids) showed lower levels in the low site. However, comparing grape samples from the three sites at the same level of ripeness, the low one displayed significantly higher amounts for all the classes of aromas. 

Preliminary results from gene expression analysis showed that the linalool synthase VvPNLinNer1 was more expressed in samples collected from the medium site. This result correlated with the higher accumulation of linalool plus its derivatives in this site.

Download the PDF

DOI:

Publication date: July 31, 2020

Issue: Terroir 2014

Type: Article

Authors

Federica GAIOTTI (1), Fabiola MATARESE (2), Nicola BELFIORE (1), Fabrizio BATTISTA (1), Claudio D’ONOFRIO (2), Diego TOMASI (1)

(1) CRA Consiglio per la Ricerca e la Sperimentazione in Agricoltura – Centro di Ricerca per la Viticoltura, Viale XXVII Aprile 26, 31015 Conegliano (TV) – Italy 
(2) Department of Agriculture, Food and Environment – University of Pisa – Via del Borghetto 80, 56124 Pisa – Italy

Contact the author

 

Keywords

aroma compounds, temperature, altitude, climate

Tags

IVES Conference Series | Terroir 2014

Citation

Related articles…

Spatio-temporal analysis of grapevine water behaviour in hillslope vineyards. the example of corton hill, Burgundy

Hillslope vineyards show various and complex water dynamics between soil and plants, and in order to gain further insight into this phenomenon, 8 grapevine plots were monitored during three vintages, from 2010 to 2013, on Corton Hill, Burgundy, France.
Read More

Improvement of non-Saccharomyces yeast dominance during must fermentation by using spontaneous mutants resistant to SO2, EtOH and high pressure of CO2

AIM: A genetic study of four wine T. delbrueckii strains was done. Spore clones free of possible recessive growth‐retarding alleles with enhanced resistance to winemaking stressing conditions were obtained from these yeasts. METHODS: The genetic marker of resistance to cycloheximide (cyhR) allows easy monitoring of the new mutants obtained from these yeasts.

Read More

Are Farm to fork strategy goals reasonable and achievable? State of the art of Península de Setubal’s winegrowers

The European Union’s “farm to fork” strategy sets out several objectives to be achieved by farmers, who, among others, relate to increasing biodiversity, protecting soils and reducing the use of pesticides. At a time when the amendments to the national plans of Sustainable Use of pesticides are being discussed, it is important to understand what the Setúbal Peninsula region status is.

Read More

Effects of severe shoot trimming at different phenological stages on the composition of Merlot grapes

High concentration of sugars in grapes and alcohols in wines is one of the consequences of climate change on viticulture production in several wine regions. One of the options to alleviate this potential problem is to perform severe shoot trimming of the vines to limit the production of carbohydrates. Two different studies were performed in order to investigate the effects of severe shoot trimming on the composition of Merlot grapes; in a first study severe shoot trimming was performed at three different phenological stages (at berry set, at the beginning of veraison and at the end of veraison), while in a second study two trimming treatments (standard shoot trimming and severe shoot trimming performed at the end of veraison) were combined with two shoot densities in order to evaluate the relative impact of these treatments on Merlot grape composition.

Read More

Ripening characterization and modelling of Listan negro grape in Spain using a regression analysis

The professional winegrower usually selects the harvest date considering several elements, such as the vine stem and berry colour, the flavour, appearance and grain elasticity. Nowadays these elements have turned old fashioned.

Read More