Métodos pre-germinativos na emergência de plântulas de umbuzeiro (Spondias tuberosa Arruda Câmara)

Abstract

The umbu tree (Spondias tuberosa) is a species native to the Brazilian semi-arid region and is economically important, due to its nutritional value and the potential for various commercial uses that contribute to subsistence and the local economy. Although it is traditionally propagated by sexual and asexual methods, the emergence of pyrenes is slow and irregular due to the rigid seed coat. To optimize emergence and improve seedling production, this research aimed to evaluate the effect of different concentrations of the growth regulator ProGibb® on the emergence of umbuzeiro pyrene. In the trial, a completely randomized experimental design was used, with 4 replications and 25 seeds in each experimental unit. The treatments were arranged in a 2x2+3 factorial scheme, two conditions for handling pyrenes (without imbibition and with imbibition in water), four concentrations of the ProGibb® growth regulator (0; 1; 2; 3 mg L -1). Seven treatments were carried out: T1 (Without Distal Cutting and Without Water Soaking); T2 (Without distal cut and with water imbibition); T3 (With distal cut and without water imbibition); T4 (With distal cut and with water imbibition); T5 (With distal cut and with imbibition 50 mg of ProGibb®); T6 (With distal cut and with imbibition 100 mg of ProGibb®); and T7 (With distal cut and with imbibition 150 mg of ProGibb®).