Mecanismos ecofisiológicos e bioquímicos de plantas jovens de Parkia pendula (willd.) Benth. ex Walp urb. submetidas à deficiência hídrica.

Abstract

The Parkia pendula (Willd.) Benth. ex Walp. is a forest species that when subjected to adverse conditions, develops physiological and biochemical mechanisms of tolerance to water stress. Thus, the objective was to increase knowledge about the mechanisms of Visgueiro responses by studying aspects physiological and biochemical eco seeking a better understanding of the strategies developed by this species under water stress process. The experiment was conducted in a greenhouse at the Federal Rural University of Amazonia, and the physiological and Biochemical analyzes performed on Biodiversity Studies Laboratory in Higher Plants, Belém, Pará. The young plants used were bought at AIMEX, approximately seven months of age, measuring 10-15 cm in height, and placed in plastic pots with a capacity of 7,5L. The substrate used was loamy black soil. The experimental design was completely randomized in subdivided plots 2x3 (two water conditions: control and water stress, and three evaluation times) totaling 30 experimental units, in which each experimental unit consisted of a plant / pot. The experimental results were submitted to analysis of variance, and when found significant differences in means were compared by Tukey test at 5% significance level. The relative water content in plants subjected to water stress significantly reduced over time, compared to plants subjected to water supply. The suspension of irrigation for 10 days was sufficient to alter the metabolism of plants Visgueiro, increasing the total soluble carbohydrate concentrations and sucrose concentrations in leaves and roots, free ammonium concentrations, glycine and proline as the amino acid concentrations and total soluble antioxidant enzymes in shares valued reducing their growth measures, the concentrations of total soluble protein, nitrate and nitrate reductase activity in the leaves and roots. However, it can be seen that the species under test even with a reduction in its water content held on its active carbon metabolism. However, it can be seen that the species under test even with a reduction in its water content held on its active carbon metabolism. Nitrogen Metabolism indicators and oxidative system analyzed were efficient to evaluate the metabolic state of Visgueiro plants subjected to water stress.