Germinação de sementes e crescimento de Ormosia arborea em diferentes temperaturas e substratos

Abstract

-Olho-de-cabra species belonging to the Fabaceae family, distributed through of Atlantic rain forest and semideciduous stationary forest. Its wood is suitable for manufacture of furniture and tree recommended for urban forestry and also considered medicinal. Taking into account their potential use this work was developed with the objective of evaluates the effect of different temperatures and substrates on the germination rate and initial root growth. The seeds used in this experiment were collected in the Savannah areas, Mato Grosso do Sul state and submitted to constant temperatures of 20, 25, 30, 35 °C and alternating, 20-30 and 25-35 °C, in three substrates, sand, vermiculite and paper roll, in germination cameras. The statistical design was a completely randomized design and means were compared by Tukey test at 5%. The data indicated that the species need a period of time longer than 15 days for the formation of aerial part and that the development of its root system is faster. The obtained results show that the best temperatures to the seeds germination is 30 °C, sand, while the best seedling development was observed in the alternating temperature, 25-35 °C, also in sand, with its results statistically higher than other treatments. Key Words: Forest seeds, initial growth, Fabaceae, native species.Resumo -A espécie olho-de-cabra pertence à família Fabaceae, ocorrendo principalmente na Floresta Pluvial Atlântica e latifoliada semidecídua; sua madeira é indicada para construção de móveis e a árvore é recomendada para arborização urbana, além de ser considerada medicinal. Levando-se em consideração seu potencial de utilização, este trabalho foi desenvolvido com o objetivo de verificar o efeito de diferentes temperaturas e substratos sobre as taxas de germinação e crescimento radicular inicial. As sementes utilizadas foram coletadas em áreas de Cerrado, Mato Grosso do Sul e submetidas a seis temperaturas, constantes de 20, 25, 30 e 35 °C e alternadas, 20-30 e 25-35 °C, em três tipos de substratos, areia, vermiculita e rolo de papel, em câmaras de germinação. O delineamento estatístico utilizado foi o inteiramente casualizado e as médias comparadas pelo teste de Tukey a 5%. Os dados obtidos indicaram que a espécie necessita de um período de tempo maior que 15 dias para a formação de sua parte aérea e que o desenvolvimento do seu sistema radicular é mais rápido, com maior percentagem de germinação e vigor de sementes na temperatura de 30 °C, substrato areia. O melhor desenvolvimento das plântulas foi observado na temperatura alternada de 25-35 °C, também no substrato areia, sendo seus resultados estatisticamente superiores aos demais tratamentos. palavras chave: crescimento inicial, espécies nativas, Fabaceae, sementes Florestais.Resumen -La especie "olho-de-cabra", perteneciente a la familia de las Fabáceas, es típica de las selvas pluviales atlánticas y los bosques estacionales semidecíduos. Su madera es apropiada para la construcción de muebles y el árbol es recomendado para forestaciones urbanas, t...

Relationships between substrate and the mobilization of reserve with temperature during seed germination of Ormosia coarctata Jack.

“…This temperature range is the same as that of the environment where seeds were collected. Oliveira et al (2016) verified GSI values of Ormosia arborea seeds similar to those of the present study. According to the authors, 25-35 °C is the optimal germination temperature range for the species.…”

SEED GERMINATION AND SEEDLING FORMATION OF Eugenia stictopetala (MYRTACEAE) UNDER DIFFERENT ENVIRONMENTAL CONDITIONS

“…Evaluating seed germination of Ormosia arborea (Vell.) Harms, Oliveira et al (2016) indicated that the tested lower temperature, 20 °C, affected negatively the germination process, in correlation with the seeds kinetic energy decrease, a result similar to that found by this work.…”

TETRAZOLIUM AND INTERACTION OF TEMPERATURE AND LIGHT UNDER SEED GERMINATION IN Ormosia arborea (FABACEAE)

“…The lowest Mean germination time for seed germination occurred at 30 o C in the presence of light, while for the absence of light, the lowest mean germination time occurred at 25, 30, 35, and 20-30 o C. The temperatures of 25, 30, and 20-30 o C promoted faster germination speeds both in the absence and presence of light (Figure 1). In another study with the same species, the authors indicated the temperature of 30 o C as the best for seed germination on the substrate containing sand (Oliveira et al, 2016). O. arborea seeds require a long period to germinate, as do many native species.…”