Atividade da enzima Catalase durante a fase de repouso hibernal em pereiras cultivadas na região Sul do Brasil

Abstract

The main problem of expansion is the question of adapting this fruit in mild winter conditions. Where the main problem is the question of adapting this fruit in mild winter conditions. Based on this, it is fundamental to study the dynamics of dormancy, in order to select cultivars that best adapt to the mild winter conditions found in Brazil, as well as their physiological behavior when there is no requirement in the number of cold hours served . The aim of this study was to study the enzyme Catalase and to relate its behavior to the dynamics of three cultivars (20th century, Shinseiki and Santa Maria) cultivated in Pelotas, RS, aiming at a better adaptation of the culture. . In the period from May to September / 2017 collections of segments of adult plants with x years were carried out, containing from two to four buds. Later this plant material was taken to the Biochemistry Laboratory of UFPel, where extractions and quantification of the enzyme Catalase were carried out. The experimental design was completely randomized blocks, with three cultivars and five collection seasons, with three replicates, each replicate consisting of three floors. It was concluded that there is a clear influence of the genetic factor on the activity of Catalase among the cultivars tested and that frequent temperature fluctuations, characteristic of the state of Rio Grande do Sul, are the reason why the pear buds do not fall into deep dormancy during the Winter. The development of the present work allowed to understand that in conditions of variability in the time, the entrance of the gems to the dormancy stage varies with the cultivar, being important information for the decision making in the selection of the cultivars.