Mecanismos fisiológicos, bioquímicos, antioxidantes e crescimento em mudas de Tachigali vulgaris L.G. Silva & H.C. Lima submetidas à deficiência hídrica.

Abstract

It is very likely that heat waves will occur more frequently and last longer, precipitation events will become more intense and frequent and in some regions of the Amazon occurred decrease in water availability, which in turn will directly affect the duration and intensity flooding and drought station. The experiment was conducted in a greenhouse Studies Laboratory of Biodiversidade of Higher Plants EBPS / UFRA, the experimental design was completely randomized in a factorial 3 x 2 (three times: zero, five and ten days of water suspension, and two water conditions: control and drought stress), with four repetitions, totaling 24 experimental units (one plant / pot). It is applied to the ANOVA results and when significant difference, the means were compared using the t test adopting the 5% level of probability through the statistical package (7.7 beta Assistat, 2015). The CRA, gas exchange and growth variables were strongly affected by factors related to soil water availability especially when the conditions deficiency advanced. Reflected in carbon metabolism and nitrogen, with reduction in nitrate concentrations, starch and nitrate reductase; increase in ammonium concentration, proline, sucrose, amino acids and carbohydrates. And also committed the antioxidant activity of plants, since they were able to quickly launch the defense system, both enzymatic (SOD, APX and CAT), the non-enzymatic (carotenoids), the latter showed no increase in activity . However, failing to reduce oxidative damage resulting in the death of them.