GERMINATIVE PERFORMANCE OF MULUNGÚ SEEDS (Ormosia grossa Rudd) AFTER DORMANCY OVERCOMING

Abstract

Ormosia grossa Rudd is an Amazonian species that presents bicolor seeds, allowing its exploration for handicraft and decoration making. This paper aimed to analyze the influence of different methods to overcome dormancy on the germinative performance of Ormosia grossa seeds. To conduct the experiment, the following treatments were established: T1= scarification with 80-grit sandpaper and water immersion at room temperature for 24 hours; T2= puncturing and water immersion at room temperature for 24 hours; T3= scarification with 80-grit sandpaper; T4= puncturing; T5= immersion in water heated to 80 ºC for five minutes, and T6= Control - seeds without any treatment. The seeds germinate slowly and irregularly. Depending on the treatment, germination started between 10 and 32 days and, if there is no adequate pre-germinative treatment to overcome dormancy, it can exceed such time. The phytomass performance and seedling lengths were superior in the T1 and T2 treatments. The scarification by abrasiveness and puncturing treatments are efficient to overcome dormancy, thus increasing the speed (3.76 and 3.12) and germination percentage (98% and 96%) after ten days. The control was 0.01 (IVG), and germination of 37%. Therefore, it is recommended the method of scarification with sandpaper followed by seed imbibition in water at room temperature for 24 hours, as it provides the best seedling performance and germination.

Determination of physical properties and viability in different colors of Pueraria seeds

“…It is essential to report that some authors relate the seed format to some survival mechanisms of the species when in adverse situations. For example, the shape of the seeds is consistently linked to the longevity of the seeds in soil seed banks (PINHEIRO et al, 2021), explaining the tolerance to fire or heat of seeds recovered after fires (RUPRECHT et al, 2015). Furthermore, directional selection results from the choice of dispersers when selecting fruits and seeds (HEELWRIGHT, 1993;SOBRAL et al, 2014;RIBEIRO et al, 2016).…”

“…It is widely used in the Amazon, intercropped with crops and soil cover (PINHEIRO et al, 2017). In addition, germinative processes influenced by quiescence and dormancy also reflect the absence of viable seed germination (PINHEIRO et al, 2021). However, germination requires mechanisms that offer ideal conditions to achieve optimum seedling development.…”