Ação do ácido 5-aminolevulínico como atenuador em plantas jovens de jatobá (Hymenaea courbaril. L.) submetidas a diferentes dosagens de cádmio

Abstract

Environmental contamination by heavy metals is one of the main issues of modern times, primarily affecting soils and potentially reaching the population through natural processes via contaminated water and food. Cadmium is among these metals, capable of bioaccumulating in living organisms. In this context, the aim of this study was to assess the application of 5- aminolevulinic acid as a mitigator of cadmium stress in plant tissues in young jatob· plants. The experiment was conducted in the greenhouse of the Institute of Agricultural Sciences. The design was randomized complete blocks with a 3x2 factorial scheme, with 3 concentrations of cadmium chloride: control (0), 15, and 30 mg L-1, and 2 concentrations of 5-aminolevulinic acid (ALA): control (0) and 100 mg L-1, resulting in 6 treatments, totaling 30 plants. The analyzed variables were proline, total soluble amino acids, total soluble carbohydrates, sucrose, free ammonium, and total soluble proteins. Both concentrations of cadmium negatively affected the evaluated biochemical variables, with roots being the most affected organs by this toxicity. Despite the varied results obtained in the interaction between Cadmium and 5-Aminolevulinic Acid, it can be observed that it positively affected stress, either by inhibiting toxicity or enhancing the defense mechanism of the plants.