| Autor: |
Santos GAND; Post-graduation Program in Tropical Agronomy, Federal University of Amazonas, Manaus, Amazonas, Brazil., Scherer Filho C; Post-graduation Program in Animal Science, Federal University of Amazonas, Manaus, Amazonas, Brazil., Schimpl FC; Federal Institute of Education, Science and Technology of Amazonas/Campus, Presidente Figueiredo, Amazonas, Brazil., Souza SCR; Department of Botany, Federal University of São Carlos, São Paulo, Brazil., Nina Junior ADR; Federal Institute of Education, Science and Technology of Amazonas/Campus, Humaitá, Amazonas, Brazil., Garcia RPO; Department of Plant Biology, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil., Silva JFD; Department of Animal and Plant Production, Federal University of Amazonas, Manaus, Amazonas, Brazil. |
| Abstrakt: |
Guarana ( Paullinia cupana Kunth var. sorbilis ) is a typically Amazonian plant of high economic value due to the compounds found in its seed. For guarana to reach the maximum productive potential, management practices such as weed control are necessary. The use of herbicides is a viable alternative, however, its drift may lead to adverse effects on the primary and secondary plant metabolisms and cause losses in crop production. This study evaluated the differential drift effects of glyphosate doses on the physiology of guarana plants and the production of compounds of economic interest in their seeds. Glyphosate doses (57.6, 115.2, 230.4, 460.8 g ae ha -1 ) were applied to adult guarana plants after the flowering period. The photosynthetic functions and metabolism effects were evaluated. Herbicide treatments led to oxidative stress due to increased lipid peroxidation and increased carbohydrate and amino acid in their leaflets. Despite this, glyphosate showed no effect on fruit production or the content of secondary metabolites of commercial interest in seeds. |
