METHYLXANTHINS AND TANNINS CONTENT IN YOUNG LEAVES OF GUARANAZE CULTIVARS UNDER DIFFERENT PRODUCTION SYSTEMS

• DOI: 10.22533/at.ed.1593982328113

• Palavras-chave: Caffeine, Theobromine, Epicatechin, Catechin, Fertilization, Paullinia cupana.

• Keywords: Caffeine, Theobromine, Epicatechin, Catechin, Fertilization, Paullinia cupana.

• Abstract:

  Young leaves of seven guarana cultivars were collected (April/2019), in the Amazonian municipalities of Maués, Presidente Figueiredo and Manaus, from ten plants/cultivar, in each location, in three different production systems (Embrapa production system; production system adopted by Jayoro and integrated production system). The samples were dried in a forced ventilation oven and the extraction and quantification of caffeine, theobromine, catechin and epicatechin followed the methodology proposed by Schimpl et al. (2014) and Machado et al. (2018). A two-factor ANOVA without repetition was performed. The factors were guarana tree cultivars and production system, with averages of cultivar repetition and production system of the municipalities where guarana tree is cultivated. There were no significant differences between cultivars for caffeine, theobromine and epicatechin content. In turn, catechin discriminated the cultivars into three groups; the cultivar BRS CG Amazonas presented the highest content (2.67%), followed by BRS CG Andirá (1.60%) and the group consisting of the cultivars BRS CG Maués, BRS CG Cereçaporanga, BRS CG Luzeia, BRS CG Mundurucânia and, BRS CG Saterê, the last five not having differed from each other. Caffeine and epicatechin showed no differences between the Production Systems, whereas, for theobromine, the Integrated Production System presented the highest content (5.71%), with the Jayoro and Embrapa Production Systems in second place, not differing between yes. Catechin revealed a higher content in the Embrapa Production System, with the Integrated Production and Jayoro systems in second place, not differing from each other. This information can contribute to the understanding of preference and non-preference, as mechanisms of susceptibility and resistance, respectively, of guarana genotypes in the relationship with insect pests, in the process of herbivory. Likewise, it can help to elucidate the fungus’ preference: Colletotric