"Aroeira-do-sertão" (Myracrodruon urundeuva Fr. All.) is a tree species that has great economic value due to the chemical properties of its bark, which has high tannin content. On account of the predatory exploitation it has been placed in the official list of threatened species of the Brazilian flora, in the vulnerable category. Micropropagation has been considered an important form of multiplication of this species in the search for an alternative for its sustainable exploitation. This study was conducted with the aim of inducing callus from leaf segments using 2,4-D and characterizing them according to their morphological and biochemical aspects. The obtained results indicate that it is possible to induce callus from leaf segments of M. urundeuva using 2,4-dichlorophenoxyacetic (2,4-D). The obtained calluses were compact and non-embryogenic, with average values of 43.32 mg g-1 total soluble sugars, 23.62 mg g-1 reducing sugars, 3.157 mg g-1 total protein, 3.147 mg g-1 free-form amino acids and 0.914 mg g-1 phenolic compounds in the fresh matter.
"aroeira"; callus formation; SEM; biochemical analyses
