Separação da dormência em sementes de maracujázeiro (Passiflora cincinnata mast)

Abstract

The species Passiflora cincinnata Mast, known as wild passion fruit or passion fruit from the caatinga, has plants used for ornamental purposes and as rootstocks due to their tolerance to water stress, the virus known as Cowpea aphid-borne mosaic virus (CABMV) and resistance to Phytophtora sp. The fruits from this species have culinary potential, such as juices, ice creams and jellies, in addition to medicinal properties. However, the use of seeds from native plants, accessibleto small producers, is one of the main obstacles to expansion due to uneven emergence, requiringthe use of techniques to overcome physical and physiological dormancy. With the aim of evaluating different products in overcoming dormancy in passion fruit seeds from the caatinga, the experiment was conducted in a greenhouse at the Federal University of Paraíba-UFPB, campus II, Areia-PB. The experimental design was completely randomized (CRD), with five treatments and four replicates, with 50 seeds per plot: T0- without immersion; T1- immersion of seeds in water for 24 hours; T2- immersion of seeds for 24 hours in the solution using the Stimulate® product at a concentration of 50mg/L of gibberellic acid; T3- immersion for 24 hours in the solution using the Matriz G® product at a concentration of 50mg/L of gibberellic acid; T4- immersion for 24 hoursin a solution using the Progib400® product at a concentration of 50mg/L of gibberellic acid. Sowing was carried out in polyethylene trays at a depth of one centimeter, in autoclaved sand. Theevaluated characteristics were: First count (PC); emergence (E); emergence speed index (IVE); average emergence time (TME). After obtaining the data, statistical analysis was performed, so that the means were compared by analysis of variance and, when significant, by Tukey's test at 5%probability. The seeds soaked for 24 h with Progib 400® at 15% and Stimulate® at 7% showed better emergence. Mechanical scarification associated with soaking with Progib 400® promotes better vigor and emergence rates. The application of Progib 400® is recommended for breaking dormancy of P. cincinnata seeds, as it increases vigor and seedling emergence.