Alelopatia em acículas verdes de Pinus elliottii: subsídios para a ecologia de invasão

Abstract

There is vast knowledge about the management of planted forests of Pinus, which has returned to production, but little is known in the intrinsic terms related to the dynamics of the invasion of species. Allelopathy is one factor that acts directly on the survival and evolution of the species. Therefore, this study aims to evaluate the allelopathic potential of green needles of Pinus elliottii in the germination and and early growth of Lactuca sativa L. (lettuce). The experiment was conducted in a completely randomized design with the treatments distributed in factorial (2x5), shape extraction (distilled water and ethanol) x extracts concentrations (0, 5, 10, 15 and 20%) in six repetitions under conditions temperature, humidity and light controlled. The evaluations were performed at regular time intervals 24 hours, from 0 to 240 hours. From the collected data, four things were determined: the percentage of germination, emergence speed index, average time of emergency, length and dry mass of seedlings. The aqueous extract of needles of P. elliottii presented inhibitory property on germination, emergency speed index and initial growth of Lactuca sativa, where the effect increased as the concentration increased.