Qualidade e potencial antioxidante de cultivares de uvas para mesa influenciados por diferentes porta-enxertos em condições tropicais

Abstract

In vines growing in temperate regions, only one harvest per year is possible, due to the occurrence of low temperatures during autumn-winter, whereas in tropical conditions the plant has its physiological processes favored. Considering theses aspects, research has been carried out aiming to recommend better cultivars for regions of tropical climate that produce grapes throughout the year, with economic potential and insertion in the international market. In the sub-middle region of São Francisco Valley, grapevine is one of the most important culture, emphasizing the seedless cultivars. However, these cultivars have irregular production, intensive labor and many management techniques. This study aimed to determine the influence of different rootstocks on quality and antioxidant capacity of new table grape cultivars with potential for production in the Sub-middle region of São Francisco Valley. Three cultivars were studied, according to their productive performance indicated in previous researches, namely: A Dona, BRS Clara and Arizul. They were evaluated on the rootstocks IAC 313, IAC 572, IAC 766, SO4, Paulsen 1103 and Harmony, in two seasons. Under regional conditions, quality was influenced by the season and is enhanced by some rootstocks in 'A Dona' grapes. The production from March to July 2017 favored the quality of 'BRS Clara' grapes, evidenced by lower solid solids/titratable acidity (SS/TA) ratio, higher berry mass and antioxidant activity. The quality of 'Arizul' grapes was also better in that productive cycle, showed by larger berries, lower acidity and SS/TA ratio and better color indexes.