Training systems, rootstocks and climatic conditions influence quality and antioxidant activity of ‘BRS Cora’ grape

Abstract

Environmental and production factors might affect grapevine physiology. Estimating these effects is essential for planning the harvest and predicting the quality of grapes. The aim of this study was to characterize the quality and antioxidant potential of ‘BRS Cora’ grapes with different training systems and rootstocks in production cycles of the second half of the year under tropical conditions. The experimental design was randomized blocks with sub-subdivided plots over time. Three training systems and two rootstocks were studied in production cycles referring to the second halves of 2017 and 2018. In 2017, the grapes of plants trained with lyre and vertical shoot positioning (VSP) had the highest soluble solids and sugars contents, and in 2018, this response occurred with the overhead trellis system. There was lower variation in titratable acidity between cycles of grapevines trained with VSP and lyre, as well as in those grafted onto ‘IAC 572’. In 2018, lyre with ‘IAC 572’ promoted higher pigment accumulation. Climatic conditions in 2017 provided a higher accumulation of polyphenols and antioxidant activity in grapes of plants trained with lyre with ‘IAC 766’. The efficiency of the training system within each cycle, associated with the effect of the rootstock, resulted in differentiated responses according to climatic conditions.

Non-Commercial Grapevines Hybrids Fruits as a Novel Food of High Antioxidant Activity

“…The highest antioxidant activity (AA) in the skins (measured by the DPPH method) was found for the Beta variety (4.34 mg TE/g f.m.). These results correspond with the study of Costa and Ferreira (2021) [ 24 ], who reported that fruits of the BRS Cora cultivar (which are similar in color at maturity to Beta) exhibit AA ranging from 3.6 to 4.64 mg TE/g f.m. We also found the highest AA value for fresh fruit pulp of white Michigan (1.89 mg TE/g f.m.…”

Impact of trellis systems and rootstocks on global phenolic composition and antioxidant activity of ‘Isabel Precoce’ grapes produced during rainy seasons in semi-arid region of Brazil

“…The differentiated response between harvest seasons confirms the results reported by Costa et al (2021), who studied grapevine cultivar 'BRS Cora' in a tropical climate and correlated environmental conditions with the accumulation of phenolics, which caused differences in the antioxidant activity of the grapes. Similar to total extractable polyphenols, grapevines grafted on 'IAC 766' trained to lyre produced grapes with higher antioxidant activity in season 2, with a higher solar radiation rate, according to the ABTS •+ capture method.…”

“…The adoption of this rootstock, which is widely recognized for its high vigor in tropical conditions, resulted in the highest soluble solids contents in berries. This might be explained by the higher uptake of light provided by the systems lyre and OTS systems, validating that the rootstock influences bunch quality even if responses vary according to the climatic conditions, scion cultivar, and trellis system adopted (Ferreira et al, 2019;Costa et al, 2021).…”

“…According to Costa et al (2021), grapevine cultivar 'BRS Cora' grafted onto 'IAC 766' trained to lyre accumulates more phenolic compounds as this system promotes a moderate stress when exposing grape bunches to radiation. Vigor might induce an increased canopy density, which influences the grape quality and the accumulation of phenolic compounds (Costa et al, 2021). Thus, it can be inferred that, in general, in plants trained with lyre enabled canopy opening and some bunch protection for adequate capture of incident light.…”

“…Therefore, due to the influence of trellis systems and rootstocks on berry quality and composition of grapevines cultivated in tropical regions (Costa et al, 2021), the stability of chemical compounds of commercial interest during the harvest seasons of the same period of the year must be understood. The possibility of lower variations in chemical compound contents, particularly sugars, organic acids, pigments and phenolics, ensures a predictable grape quality across harvests, and thus supports the characterization of typicality for grapes and their derivatives as juices when 'Isabel Precoce' and similar cultivars are grown.…”