Bottura, M.

Cappello, N.

Malacarne, M.

Moser, S.

Roman Villegas, T.

Stefanini, M.

English

Archivio istituzionale della ricerca - Fondazione Edmund Mach

22nd GiESCO International MeetingCornell University, Ithaca, USA, 2023RIPENING BEHAVIOUR AND GRAPE MUST QUALITY OF ELEVEN WHITE RESISTANT VARIETIESIN TRENTINOAuthors: Tomas Roman1*, Nicola Cappello1, Maurizio Bottura1, Sergio Moser, Marco Stefanini1, Mario Malacarne11Fondazione Edmund Mach, Via E. Mach n.1, 38010, San Michele all’Adige, Italia.*Corresponding author: tomas.roman@fmach.itAbstract:Context and purpose of the study -. In a situation of uncertainty towards the overall effect of climate change andthe reduction of pestice utilization on quality, the wine sector needs to maintain the profitability of producers,which inexorably depends on ensuring the quality of grapes and wines. Among the various alternatives that can beadopted, hybrid varieties carrying resistance genes are currently gaining the attention of researchers andproducers. Some of them are already a reality and are included in the national catalogue of some countries,selected by research institutes all over Europe. Although the area planted is still limited, the relevance of resistantvarieties is increasing, partly because they can be also a short-term solution in areas with high fungal pressure, fortheir use where pesticides conflict with sensitive inhabited areas or where the slope of cultivation makesmechanisation difficult. Even so, the estimated 70% reduction in fungal treatments that their use could bring, addsan important economic variable to the equation. The introduction of resistant genotypes in the wine chain still hasto overcome some challenges: commercial, regulatory (e.g. their authorisation in the Protected Designations ofOrigin) or technical, such as the adaptive response of the variety to different environments or the organoleptic andqualitative features of its wines. In view to adopt resistant varieties as a strategy, there is a clear need to analysethe adaptability of the different genotypes in situ. The purpose of the study was to monitore the ripeningbehaviour of eleven resistant varieties grown in Trentino, an alpine production area in the north-east of Italy, andthe main quality parameters of grapes at harvest, comparing results to those of Chardonnay, the most cultivatedvariety in Trentino.Material and methods – The main ripening parameters of twelve white varieties (Chardonnay, Bronner, Solaris,Johanniter, Souvignier Gris, Palma, Charvir, Valnosia, Muscaris, V2, V10 and V11) were weekly monitored for 5consecutive years (2016-2021) during the last month before harvest. Vines were grown in two experimental plotslocated in the floor of the Adige valley: Navicello (220 m above sea level) and Girelli (195 m), managed with verticalshoot positioned trellis system on alluvional soils. Grapes were harvested at technological maturity for theproduction of white wine ensuring, at least, 12 % v/v.Results – Depending on the variety and vintage, the range of soluble solids varied between 17.5 and 27.5 ºBrix,parameter for which some varieties, like Muscaris, Souvignier Gris and V1, always exceeded that of Chardonnay atharvest. pH ranged from below 2.8 to over 3.6 units, being Muscaris, Valnosia and Johanniter those with thehighest pH and Charvir, Palma and V2 normally placed under the median value of Chardonnay. The total acidity(expressed as tartaric acid) varied from a concentration below 5 g/L up to exceed 10 g/L, however, with differentacidic profiles. In general, the concentration of malic acid of resistant varieties was lower respect to Chardonnay,and tartaric acid higher. At this regard, some phenotypes showed an acidity degradation curve slower thanChardonnay during the last stages of ripening, like V11, Bronner or Palma. Mean differences on the harverst daybetween the earliest (Solaris) and the latest (V10) exceeded 40 days.Keywords: Resistant varieties, ripening, must quality, adaptation

Ripening behaviour and grape must quality of eleven white resistant varieties in Trentino

https://openpub.fmach.it/bitstream/10449/83306/1/2023%20GiESCO%20Roman.pdf

Ripening behaviour and grape must quality of eleven white resistant varieties in Trentino

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