Germination and dessication of Hancornia speciosa Gomes seeds

Abstract

ABSTRACT:The aim of this work was describe the germination and evaluate the desiccation and reduction in desiccation sensitivity of Hancornia speciosa Gomes seeds. Initially, we evaluated the germination characteristics and morphophysiological aspects of seedlings. The seeds in the first experiment were subjected to fast desiccation (activated silica gel) and slow desiccation (laboratory conditions) until the water content reached 40%, 30%, 20%, and 15% ± 2%. To reduce the desiccation sensitivity, in the second experiment, the seeds were soaked in polyethylene glycol (PEG) at potentials of -0.1 and -0.3 MPa for 120 h, with or without abscisic acid (ABA) (10 -4 µM), and subsequently subjected to fast desiccation until a water content of 15% was reached, based on the results from the first experiment. The seed vigor in both experiments was evaluated by the primary root protrusion tests, percentage of normal seedlings, germination speed index, length and mass (shoot, underground, and total). Seedlings of H. speciosa feature a stem-like xylopodium structure. The seeds were tolerant to water reduction up to 15% by fast desiccation and 30% by slow desiccation. Moreover, priming was not efficient in reducing the desiccation sensitivity of H. speciosa seeds.

Physical and physiological quality of mangaba seeds obtained by different processing methods

“…The vigor that was indirectly determined by the length of the seedlings did not differ for the two processing methods that were used. This finding has implied that the detections of high vigor for the seeds in this study when considering the values that were observed for seedling lengths, were higher than those that have been reported in the literature for mangaba seeds that have been previously studied, such as 13.46 cm (4.96 cm aerial part, and 8.5 cm root) (Santos et al, 2010) and 16.21 cm (Dresch et al, 2016).…”

Overcoming Hancornia speciosa seed recalcitrance: harvest season and storage time

“…Water content is directly related to seed viability in desiccation-sensitive species, including H. speciosa (Oliveira and Valio 1992), which is dispersed with 48-56% of water content, and a reduction to 38% or below causes a gradual loss in viability (Santos et al 2010). A reduction of H. speciosa seed water content to 15% led to a decrease of 30% in radicle protrusion in a previous study (Dresch et al 2016). Consequently, due to the species' desiccation sensitivity, maintaining high-water content in an osmoprotective solution during storage may be bene cial for its prolonged viability.…”

Advances and perspectives in the propagation of mangabeira (Hancornia speciosa Gomes) - review on a tropical fruit tree with socioeconomic importance

“…• H. speciosa seeds can be preserved for up to 50 days in preservative solutions developed for this purpose. (Santos et al, 2010;Masetto e Scalon, 2014;(Dresch et al, 2016;Nunes et al 2022c)…”