GERMINAÇÃO DE SEMENTES DE EMBIRUÇU (Pseudobombax grandiflorum (Cav.) A. Robyns) EM DIFERENTES ESTÁDIOS DE MATURAÇÃO E SUBSTRATOS

Abstract

ResumoO objetivo deste trabalho foi avaliar a germinação de sementes de embiruçu (Pseudobombax grandiflorum (Cav.) A. Robyns), colhidas em vários estádios de maturação, utilizando-se diferentes substratos. Os estádios avaliados foram 30, 60 e 80 dias após a antese (DAA) e os substratos utilizados foram papel, areia e vermiculita. O delineamento experimental utilizado foi o inteiramente casualizado (DIC), num esquema fatorial 3 x 3 (três períodos de maturação x três substratos), com quatro repetições de 25 sementes, sendo a comparação entre as médias dos tratamentos efetuada pelo teste de Tukey (α = 0,05). A vermiculita favoreceu maior porcentagem e velocidade de germinação das sementes com 60 DAA, enquanto sementes com 80 DAA germinaram igualmente nos três substratos, embora a areia tenha proporcionado maior velocidade de germinação nesse estádio. Palavras-chave: Pseudobombax grandiflorum; espécie florestal; teor de água; formação de sementes; vigor. Abstract Germination of embiruçu (Pseudobombax grandiflorum (Cav.) A. Robyns) seeds in different phases of maturity and substrates.The objective of this research was to evaluate the germination of embiruçu seeds harvested in different phases of maturity in different substrates. The evaluated phases were 30, 60 and 80 days after the anthesis (DAA) and the substrates used were paper, sand and vermiculite. The experimental design utilized was the completely randomized (DIC), in a 3 x 3 factorial scheme (three periods of maturity x three substrates), with four replications of 25 seeds. The comparison among the averages of the treatments was made using the Tukey test (α = 0,05). Vermiculite favored higher percentage and velocity of germination of seeds with 60 DAA, while seeds with 80 DAA similarly germinated in the three substrates, although sand had proportionate higher velocity of germination in this phase.

Substrates and temperatures in the germination of Eriotheca gracilipes seeds

“…Coville) seed germination at different temperatures and substrates, which concluded that for this species the biggest speed and uniformity of germination (FCG) was possible achieved using paper as a substrate and at 30 °C. Similar results were also associated with GSI obtained by Lopes et al (2008), who evaluated the physiological quality of P. grandiflorum seeds sown in vermiculite and sand and also with those found by Mondego et al (2014), in which is possible to observe that the most rapid and uniform germination of P. marginatum occurred when vermiculite was used as substrate.…”

“…At high temperatures, the sand is not able to maintain the moisture, with better efficiency in moderate temperature due to its low retention and poor distribution of water, excessively draining with the characteristic of dry at the upper portion (ALVINO; RAYOL, 2007 These results are in agreement with those obtained by Zamith and Scarano (2006), as well as by Lopes et al (2008) with other species from the Bombacaceae family, where the maximum germination percentage (95%) was observed for Pseudobombax grandiflorum (Cav.) A. Robyns.…”

“…Similarly, Barbosa et al (2004) studying other species from the Bombacaceae family, such as Ochroma lagopus Sw. and Lopes et al (2008) with P. grandiflorum found that the substrate paper are indicated in the evaluation of seeds physiology quality. Consequently, the speed and uniformity of germination are desirable characteristics, since the longer the seedling remains in the early stages of development, more it will be submitted to adverse environmental conditions, including susceptible to fungi (MARTINS et al, 2012), frequently present in covered seed by the fibers (MONDEGO et al, 2014).…”

Desempenho Germinativo De Sementes De Leucena: Avaliação De Substratos E Lâminas De Água

“…Em experimento com a espécie Pseudobombax grandiflorum (Cav.) A. Robyns, Lopes et al (2008), observaram que a velocidade do processo de germinação também sofreu influência de substrato, alcançando portanto, valor de IVG da ordem de 1,875. Desse modo, Heydecker (1972) enfatiza que alto vigor constitui-se como um dos pré-requisitos básicos para se obter um estabelecimento de plântulas, sendo esta uma condição necessária para tolerar estresses ambientais.…”

Physiological ripening of Anadenanthera colubrina (Vellozo) Brenan seeds

“…This leads to the increase in demand for native species of seeds in order to use them in natural resources restoration and conservation programs (Prudente et al, 2012), besides the search for more information about their best germination and propagation conditions (Varela et al, 2005). There are still restrictions on the knowledge about the quality of forest seeds, a characteristic that can be influenced by the ripening point in which they are (Lopes et al, 2008), as the harvesting time does not always coincide with its maximum vigor and the crop, before or after seed ripening, can influence the plant formation and seed loss (Borges and Borges, 1979).…”