Germinação de sementes de Aspidosperma subincanumMart. ex A. DC em diferentes temperaturas

Abstract

RESUMO:Aspidosperma subincanum é uma espécie arbórea utilizada em projetos de recuperação de áreas degradadas e como planta medicinal. Levando-se em consideração a importância da espécie, o presente trabalho teve como objetivo definir a temperatura ideal para a germinação de suas sementes. O material vegetal foi coletado na região do Pantanal de Miranda, Mato Grosso do Sul. As sementes foram colocadas em caixas plásticas transparentes em câmara de germinação e submetidas às temperaturas constantes de 20, 25, 30 e 35°C e alternadas de 20-30 e 25-35°C. O delineamento experimental foi inteiramente casualizado, com quatro repetições por tratamento, sendo as médias comparadas pelo teste de Tukey a 5%. A temperatura ideal para a germinação de Aspidosperma subincanum foi a 25°C, com o maior índice de velocidade de germinação, 18,8. Temperaturas mais elevadas (30 e 35°C) causaram a morte dos embriões. Palavras-chave: Pantanal, crescimento de plântulas, guatambuABSTRACT: Germination of Aspidosperma subincanum Mart. ex A. DC seeds at different temperatures. The Aspidosperma subincanumem is a tree species used in the recovery of degraded areas projects and as a medicinal plant. Taking into account the importance of the species, the current study aimed to determine which would be the ideal temperature for the germination of their seeds. The plant material was collected in the Pantanal of Miranda, Mato Grosso do Sul. The seeds were placed in transparent boxes in germination chambers and submitted to constant temperatures of, 20, 25, 30 and 35°C and alternated at 20-30 and 25-35°C, with four replicates per treatment. The statistical design was a completely randomized one. The averages were compared by Tukey test at 5%. The ideal temperature for germination of Aspidosperma subincanum was 25°C. The high temperatures (30 and 35°C) have caused the death of embryos.

Methodology for seed germination and vigor tests of Bowdichia virgilioides

“…For seedlings of S. obtusifolium (Roem & Schult.) T. D. Penn, the highest RL were obtained at 30 ºC while subjected to white light, and at 20-30 ºC under far-red light and at absence of light (Silva et al, 2014), while for Aspidosperma tomentosum Mart seedlings, temperatures of 25 and 30 ºC under the white light regime favored root development (Oliveira et al, 2011).…”

Quality of seeds of jatobá-do-cerrado processed and stored in diferents forms

“…The rheological properties of xyloglucans and galactomannans determine their use as emulsifiers, dispersants, and thickeners (MATUDA; MARIA NETO, 2005;OLIVEIRA et al, 2011).…”

“…Thus, it is important to collect seeds at the time of dispersion, to store them and to plant them when the soil is sufficiently moist in the rainy season. This practice can increase seed germination and lead to the establishment of uniform seedlings (FONSECA et al, 2005;OLIVEIRA et al, 2011;CARVALHO;NAKAGAWA, 2012). This method is particularly important for the restoration of open areas, where the desiccation of seeds and seedlings is more critical.…”

“…This method is particularly important for the restoration of open areas, where the desiccation of seeds and seedlings is more critical. Another advantage of delayed dispersal is to reduce the time in which the seeds are available for predators, which is another major obstacle for the germination of seeds and consequently, for forest regeneration (OLIVEIRA et al, 2011).…”

“…For conventional systems of genebanks, the stockpiles of seeds are stored under controlled conditions at a temperature of 10º C and 40% relative humidity. Even though the seeds in these databases are kept for a reasonable time, this does not prevent the erosion of genetic species, considering that the metabolism of seeds is completely blocked only at temperatures below -130°C (CARVALHO, 2005;OLIVEIRA et al, 2012).…”