Temperatura e substrato na germinação de sementes e no crescimento inicial de plântulas de Sapindus saponaria (Sapindaceae)

Abstract

resumo -Sapindus saponaria é uma árvore da família Sapindaceae com madeira moderadamente pesada, dura, de baixa durabilidade natural, utilizada na construção civil e fabricação de caixotaria, além de possuir uso medicinal. Ocorre no Brasil desde o Pará até o Rio Grande do Sul, em florestas pluviais e semideciduais. O objetivo deste trabalho foi avaliar a germinação das sementes e crescimento de plântulas em diferentes temperaturas e substratos, com frutos e sementes coletados no Pantanal de Miranda, Mato Grosso do Sul. As sementes foram submetidas às temperaturas constantes de 20, 25, 30 e 35°C e alternadas de 20-30 e 25-35°C (substrato papel) e posteriormente, nas mesmas temperaturas, substratos areia, vermiculita e rolo de papel, com quatro repetições de 25 sementes por tratamento em câmara de germinação. O delineamento experimental foi o inteiramente casualizado. A análise conjunta dos dados indicou que ocorreu interação (F significativo) entre os tratamentos (substratos x temperatura) para as diferentes variáveis (germinação, IVG e TMG). Em relação ao crescimento das plântulas, os valores de F também indicaram que ocorreu efeito significativo nas interações entre tratamentos. Levando-se em consideração a percentagem de germinação, IVG, TMG, tamanho e normalidade das plântulas, o tratamento entre papel a 30°C foi o que proporcionou melhor resultado. palavras-chave: SementeS FloreStaiS; pantanal; Saboneteira.TemperaTure and subsTraTe influence in seeds germinaTion and seedling formaTion of SapinduS Saponaria (sapindaceae).absTracT -Sapindus saponaria is a tree belonging to the Sapindaceae family and the wood of this tree is moderately heavy, hard and with low natural durabilty, and it is used to building and manufactura of crates, besides possessing medicinal use. It occurs in Brazil from Pará to Rio Grande do Sul, in rainforests and semideciduous forests. The aim of this work was to evaluate seed germination and the initial growth of seedlings in S. Saponaria at different temperatures and substrates using fruits and seeds collected in the Pantanal de Miranda, Mato Grosso do Sul state, Brazil. The seeds were subjected to constant temperatures of 20, 25, 30 and 35°C and alternating temperatures of 20-30 and 25-35°C (paper substrate) and subsequently, at the same temperatures, substrates sand, vermiculite and paper roll, with four replications of 25 seeds per treatment in a germination chamber. The experiment had a randomized design. The F values obtained for germination indicates that there was significant effect of substrate and temperaturesover the different variables (germination, AGT and GSI). In relation to seedling growth, the F values also indicated that there was significant effect on the interactions between treatments. Taking in consideration the germination, AGT, GSI, size and normality of seedlings, the treatment between paper, 30°C was what provided better development.

Environmental stress, future climate, and germination of Myracrodruon urundeuva seeds 1

“…The ability to germinate under extreme conditions allows the geographical and temporal distribution of a species, therefore optimizing its survival (Oliveira et al, 2017). So, the success of a species in heterogeneous environments relies on its plasticity (Lima et al, 2010).…”

Emergence and Initial Development of Erythroxylum pauferrense Seedlings under Different Substrates

“…However, the treatments with the lowest PCE values may have been characterized by low substrate moisture, making seed swelling difficult [17]. These results indicate that the most suitable substrate is the one that promotes a faster and more uniform emergence [23].…”

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

“…Normally the optimal temperature for cell division is approximately 30 ° C for most species and the results obtained for Eugenia stictopetala confirmed that this temperature was also the most adequate for its germination and initial growth. Oliveira and Pereira (2014) and Oliveira et al (2017), evaluating the best conditions for seed germination and initial formation of Guibourtia hymenaefolia (Moric.) J. Léonard seedlings, collected in areas of Serra de Bodoquena and Sapindus saponaria L., obtained in Pantanal, Mato Grosso also showed that the temperature of 30 °C was one of the most suitable for the evaluated species.…”