Global warming is endangering maintenance of optimal grape composition in white varietals aimed at sparkling wine making due to difficulties to maintain adequate acidity and fresh aromas. These troubles are being faced by the main white varietal of the Colli Piacentini district, named Ortrugo. Its vegetative and reproductive behavior was compared over 3 years with that of other minor autochthonous white varietals. Criteria set for adequate grape composition under sparkling vinification (total soluble solids at 20–21 Brix) and titratable acidity (TA)≥ 6.5 g/L combined with Principal Component Analysis (PCA) on the measured variables allowed a thinnning down of the initial group of 17 to 7 varietals including Ortrugo, Bucalò, Barbesino, Lecco, Melara, Santa Maria and Molinelli. PCA isolated Ortrugo’s behavior for inadequacy to maintain sufficient TA at harvest mostly due to extremely low malic acid concentration
Frioni, T., Bertoloni, G., Squeri, C., Garavani, A., Ronney, L., Poni, S., Gatti, M., Biodiversity of local Vitis vinifera L. germplasm: a powerful tool towards adaptation to global warming and desired grape composition, <<FRONTIERS IN PLANT SCIENCE>>, 2020; 11 (11): 1-20. [doi:10.3389/fpls.2020.00608] [http://hdl.handle.net/10807/155989]
Biodiversity of local Vitis vinifera L. germplasm: a powerful tool towards adaptation to global warming and desired grape composition
Frioni, Tommaso
;Squeri, Cecilia;Garavani, Alessandra;Poni, Stefano;Gatti, Matteo
2020
Abstract
Global warming is endangering maintenance of optimal grape composition in white varietals aimed at sparkling wine making due to difficulties to maintain adequate acidity and fresh aromas. These troubles are being faced by the main white varietal of the Colli Piacentini district, named Ortrugo. Its vegetative and reproductive behavior was compared over 3 years with that of other minor autochthonous white varietals. Criteria set for adequate grape composition under sparkling vinification (total soluble solids at 20–21 Brix) and titratable acidity (TA)≥ 6.5 g/L combined with Principal Component Analysis (PCA) on the measured variables allowed a thinnning down of the initial group of 17 to 7 varietals including Ortrugo, Bucalò, Barbesino, Lecco, Melara, Santa Maria and Molinelli. PCA isolated Ortrugo’s behavior for inadequacy to maintain sufficient TA at harvest mostly due to extremely low malic acid concentration
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