PHOTOSYNTHETIC PIGMENTS, AMINO ACID AND PROTEIN IN PLANTS YOUNG GRAVIOLA SUBMITTED TO WATER DEFICIT

Abstract

ABSTRACT: The soursop is a tropical climate plant and is cultivated in the North, Northeast, Midwest and Southeast of Brazil. The suspension fluid causes changes in the biochemical processes of the plant. This study aims to determine the effect of water stress on the content of photosynthetic pigments in the concentrations of free amino acids and soluble proteins in young plants of soursop. The experiment was conducted in a greenhouse at the Federal Rural University of Amazonia - UFRA, Campus Capitão Poço-PA. Being used soursop seedlings were subjected to two water regimes: irrigated (control) and drought, the experimental design was completely randomized with 15 replications, totaling 30 experimental units. The results were applied to analysis of variance and the averages compared by Tukey test at 5% significance level. The content of photosynthetic pigments were reduced in plants that were subjected to water deficit when compared to the control, concentrations of amino acids in plants with increased stress and protein concentrations decreased in soursop plants subjected to water deficit when they were compared with plants control.   KEY-WORDS: biochemical processes, concentrations, tropical climate.