Teores de antocianinas, fenóis totais, taninos e ácido ascórbico em uva 'bordô' sobre diferentes porta-enxertos

Abstract

This study aimed to evaluate the content of anthocyanins, total phenols, tannins and ascorbic acid in grape grown onto '420A', 'IAC-766' and 'Ripária-of-Traviú' rootstocks in three different harvest periods. The experiment was conducted in 'Bordo' grapes vineyard in Missal city, Paraná West, in the 2007/2008 harvest. The rootstock effect was evaluated in three periods after flowering: 90 days, with ripening berries, tending to a definite purple; 100 days, with berries completely purple, and 110 days, with berries overripening. The experiment was arranged in a split plot design in randomized blocks. The variables soluble solids, titratable acidity, total phenols index, anthocyanins, tannins and ascorbic acid were analyzed. The results showed that in the rootstocks '420A' and 'IAC-766', the 'Bordô' grape showed similar responses for anthocyanins, tannins, acidity and soluble solids accumulation, but the contents of phenolic compounds in the pulp and epidermis of berries were higher in '420A'. On the rootstock 'Ripária-do-Traviú', the 'Bordô' grape showed lower accumulation of anthocyanins, total phenols and tannins in the epidermis. Higher accumulations of ascorbic acid were found in 'Bordô' grapes on the rootstock 'IAC-766'. There is evidence suggesting that the 'Ripária-do-Traviú' rootstock as inferior to others in nutritional and enological aspects.