INFLUÊNCIA DA LUMINOSIDADE E FERTILIZANTES NOS TEORES DE METILXANTINAS E COMPOSTOS FENÓLICOS EM FOLHAS DE ERVA-MATE

Abstract

The Mate Tea (Ilex paraguariensis A. St.-Hil.) is a climax species adapted to low light, and that is why is more cultivated in consortium with other species of woods and more intensively that their traditional exploration. To maintain adequate levels of productivity, it is necessary the use of a fertilizer that gives nutritional intake to plants. The levels of substances of plant secondary metabolism as methylxanthines and phenolic compounds may be affected by this type of intensive management since the shading and fertilization influence the physiology of the plant. Aiming the determination of the levels of totals methylxanthines and phenolic compounds, produced under relative brightness of 30, 45 and 60%, and conventional fertilization (N, P 2 O 5 and K 2 O 15-05-30) and slow release (N, P 2 O 5 and K 2 O 15-08-12), this study was proposed for two growing seasons 2011 e 2012. The fertilization of mate tea associated with the apparent brightness levels did not promote increased levels of totals methylxanthines and phenolic compounds. The apparent brightness of 30% established the best indicator to obtain methylxanthines, and the conventional fertilization had the highest fertilization production of methylxanthine, when subjected to the apparent brightness of 30 and 45 %. There was an increase of the content of phenolic compounds of the growing season 2011 to 2012 promoted by the fertilization treatment with FLL and FC under the apparent brightness of 30% and 60%.