Initial performance of 'Rebo' wine grapes on different rootstocks and at various planting densities

O objetivo deste trabalho foi avaliar a influência de diferentes porta‑enxertos e densidades de plantio sobre o desempenho inicial da produtividade e da qualidade de uvas da cultivar Rebo, cultivada em região de alta altitude do estado de Santa Catarina, Brasil. Realizou-se um delineamento experimental de blocos ao acaso, em arranjo fatorial 5×3. Os tratamentos consistiram da combinação de cinco porta-enxertos ('101-14 Mgt', 'IAC 572', 'Paulsen 1103', 'Harmony' e 'VR 043‑43') com a uva Rebo e de três espaçamentos entre plantas (1,0, 1,2 e 1,5 m). As avaliações ocorreram durante as safras 2018/2019 e 2019/2020. Avaliaram-se as variáveis produtivas iniciais e as características físico-químicas das uvas. O porta-enxerto '101‑14 Mgt' apresentou a brotação mais precoce, e os porta-enxertos 'VR043-43' e 'IAC 572', as mais tardias. Os porta‑enxertos '101‑14 Mgt' e 'VR043-43' proporcionaram maior produtividade. Os espaçamentos de 1,0 e 1,2 m entre plantas aumentaram a produtividade inicial da vinha. Os porta-enxertos '101‑14 Mgt' e 'Harmony' contribuíram para diminuir a acidez total do mosto. O desempenho inicial da produtividade e da qualidade da uva vinífera 'Rebo' é favorecido pelo porta-enxerto '101-14 Mgt' às densidades de plantio de 1,0 a 1,2 m.The objective of this work was to evaluate the influence of different rootstocks and planting densities on the initial performance of the yield and quality of the Rebo grapes cultivars grown in a high altitude region of the state of Santa Catarina, Brazil. An experimental design with randomized complete blocks was carried out in a 5×3 factorial arrangement. The treatments consisted of the combination of five rootstocks ('101-14 Mgt', 'IAC 572', 'Paulsen 1103', 'Harmony', and 'VR 043-43') with the 'Rebo' grape, and of three spacing between plants (1.0, 1.2, and 1.5 m). The evaluations took place during the 2018/2019 and 2019/2020 crop seasons. The initial yield variables and the physicochemical characteristics of the grapes were evaluated. The '101-14 Mgt' rootstock provided early shoots, and the 'VR043‑43' and 'IAC 572' rootstocks the latest shoots. The '101-14 Mgt' and 'VR043-43' rootstocks provided a higher yield. Plant spacing at 1.0 and 1.2 m increased the initial yield of the vineyard. The '101-14 Mgt' and 'Harmony' rootstocks contributed to the lower total acidity of must. The initial performance of the yield and quality of 'Rebo' wine grape is favored by the '101-14 Mgt' rootstock at the planting densities of 1.0 to 1.2 m

Qualidade de morangos submetidos à radiação UV-C pré-colheita

The objective of this work was to evaluate the influence of the use of UV-C radiation at an intensity of 0.53 KJ m-2, during strawberry (Fragaria x ananassa) cultivation, on the physicochemical and phytochemical parameters of the fruits. The used experimental design was completely randomized, in a single-factor arrangement with 11, 19, 29, and 39 UV-C applications and without UV-C application. The hue of the fruits was smaller at the end of the study period. pH varied in strawberries that received 39 applications of UV-C, and the soluble solids content differed with 19 applications. Antioxidant activity was lower in fruits with 11, 19, and 29 UV-C applications, whereas vitamin C content was lower only in fruits that received 29 applications. The use of UV-C radiation at an intensity of 0.53 KJ m-2, during strawberry cultivation, affects the physicochemical and phytochemical parameters of the fruits, but does not cause losses in their quality.O objetivo deste trabalho foi avaliar a influência do uso de radiação UV-C na intensidade de 0,53 KJ m-2, durante o cultivo de morango (Fragaria x ananassa), sobre os parâmetros físico-químicos e fitoquímicos dos frutos. O delineamento experimental utilizado foi inteiramente casualizado, em arranjo unifatorial, com 11, 19, 29 e 39 aplicações de UV-C e sem aplicação de UV-C. A tonalidade dos frutos apresentou menor ângulo ao final do período de estudo. O pH variou em morangos que receberam 39 aplicações de UV-C, e o conteúdo de sólidos solúveis diferiu com 19 aplicações. A atividade antioxidante foi menor nas frutas com 11, 19 e 29 aplicações de UV-C, enquanto o teor de vitamina C foi menor apenas nas frutas que receberam 29 aplicações. O uso de radiação UV-C de 0,53 KJ m-2, durante o cultivo de morango, afeta os parâmetros físico-químicos e fitoquímicos dos frutos, mas não leva à perda de sua qualidade

Rootstock competition and planting spacing for cv. ‘VERMENTINO’ in an altitude region of Santa Catarina

Rootstock adequacy and planting density are necessary for new grapevine varieties in new regions. The objective of this work was to select the rootstock that confers the best productive performance to the ‘Vermentino’ variety, and to adjust the ideal spacing for this combination. The experimental design used was randomized blocks in a 5x3 factorial scheme, in which the treatments studied consisted of the combination of five rootstocks (‘101-14 Mgt’, ‘Harmony’, ‘IAC 572’, ‘Paulsen 1103’, and ‘VR 043-43’) and three spacings between plants (1.0, 1.2 and 1.5 m). The phenological cycle of the plants and the productive and quality characteristics of the grapes were evaluated during 2018/19, 2019/20, and 2020/21 harvests. Bud break of ‘Paulsen 1103’ and ‘VR 043-43’ rootstocks occurred the latest in 2019/20 and 2020/21. ‘101-14 Mgt’ and ‘Paulsen 1103’ rootstocks induced the highest yields in 2019/20 and 2020/21. The 1.0 m spacing between plants provided the highest productivity in all seasons. Thus, it can be concluded that the ‘Paulsen 1103’ and ‘VR 043-43’ rootstocks delayed bud break and decreased phenological sub-periods. ‘Paulsen 1103’ and ‘101-14 Mgt’ rootstocks contributed to increase the productivity; the ‘IAC 572’ rootstock presented the lowest contribution to the polyphenols content and antioxidant activity, and the 1.0 m spacing between plants resulted in greater productivity of the vineyard

Quality of juices from different grape cultivars obtained by distinct extraction systems

The objective of the present work was to evaluate the physicochemical and sensory quality of juices from different grape cultivars resulting from two extraction methods. Juices from eight grape cultivars (‘Bordô’, ‘SCS 421 Paulina’, ‘BRS Carmem’, ‘Concord’, ‘BRS Cora’, ‘Isabel’, ‘Isabel Precoce’ and ‘BRS Violeta’) were prepared using two extraction systems: an integral suquifier; an adapted heat exchanger. Physicochemical determinations, such as soluble solids, pH, titratable acidity, ratio (relation between soluble solids and titratable acidity), reducing sugars, density, turbidity, color, total polyphenols, anthocyanins and antioxidant activity, were evaluated in the obtained juices. Sensory assessment of the juices was also carried out based on the attributes “pleasant aroma”, “unpleasant aroma”, “acidity”, “sweetness”, “balance”, “body”, “astringency” and “overall impression”. The soluble solids content was higher when the integral suquifier was used, while total acidity was lower when the adapted heat exchanger was used for ‘BRS Carmem’ and ‘BRS Violeta’ grape cultivars. The “overall impression” of the juices showed no difference between the treatments for most grape cultivars. According to the physicochemical and antioxidant activity evaluations, the integral suquifier had superior results than the adapted heat exchanger for ‘SCS 421 Paulina’, ‘BRS Carmem’, ‘Concord’ and ‘Isabel Precoce’ grape cultivars. Sensorially, the extraction methods used did not influenced the acceptance of the juices, except for ‘BRS Carmem’, which showed greater appreciation when extracted by the integral suquifier, and for ‘Bordô’, which was more appreciated when extracted by the adapted heat exchanger method