Allelopathic effect of Pequi and Cagaita leaf extract on Tamboril seed germination

Abstract

The interaction in natural forests involves various ecological factors, since the array tree health in the production of propagating material to preventing germination of certain species by means of alelopáticos compounds. Thus, the objective of this study was to evaluate the allelopathic effect of hydroalcoholic extract of leaves of Caryocar brasiliense and Eugenia dysenterica on seed germination of Enterolobium contortisiliquum. Germination test was performed in completely randomized design, with four replicates of 25 seeds each, being the treatments: T1 = witness (distilled water); T2 = E. dysenterica in the concentration of 0.75%; T3 = E. dysenterica in the concentration of 1.5%; T4 = C. brasiliense on concentration of 0.75%; T5 = C. brasiliense on concentration of 1.5%. We evaluated the germination rate, germination speed index, as well as the number of normal, abnormal seedlings and dead. The results showed that the Cagaita extracts in two concentrations and of Pequi in lower concentration influenced negatively in the germinal process. The Pequi extract at a concentration of 1.5% was responsible for the largest number of abnormal seedlings. On the sixth day, it was possible to check larger difference in the germination speed index among the treatments.