Efeito da qualidade da luz sobre a germinação de sementes de Parkia multijuga Bentham

Abstract

Several factors are essential for species perpetuate their seeds and complete their life cycle, in this context, light acts as a prime factor. The present study aimed to evaluate the germination of Parkia multijuga seeds under four different light conditions. For each treatment, 4 replicates with 20 seeds each were used, which were placed in gerbox boxes, with filter paper as substrate. Afterwards the same were conditioned in germination chamber with established temperature between 25 and 27 °C and photoperiod of 12 h light / 12 h dark. The tested light conditions were white light (control), red, red/blue and absence of light. The analyzed variables were percentage of germination and germination speed index (GSI). Statistical analyzes were performed in the SISVAR program, when analyzes of variance were significant, the comparisons between the means of the treatments were performed by the Tukey test, both at the 5% probability level. It was verified that P. multijuga seeds can be classified as neutral or light-indifferent photoblastic seeds, because they are indifferent to the light conditions, germinating in the presence of light or on its absence. The highest percentages of seed germination (100%) were found in red/blue and red light treatments. The highest value of GSI was found in the red/blue treatment (3.28 seeds/day).