Efeito Da Temperatura E Substrato Na Germinação De Sementes De Apuleia Leiocarpa (Vogel) J.F. Macbr (amarelão)

Effect of temperature and substrate on the germination of Apuleia leiocarpa (Vogel) J.F. Macbr

(amarelão) seeds

Efeito da temperatura e substrato na germinação de sementes de Apuleia leiocarpa (Vogel) J.F. Macbr

(amarelão)

Anderson Cleiton José¹, Adriano Barros Coutinho², Eduardo Andrea Lemus Erasmo²

¹Universidade Federal de Lavras, (UFLA). Departamento de Ciências Florestais, Campus Universitário, CEP

37200-000, Caixa Postal 3037 - Lavras-MG. E-mail: [e-mail]

²Universidade Federal do Tocantins – Campus Universitário de Gurupi – UFT, Tocantins.

Recebido em: 29/08/2011 Aceito em: 30/09/2011

Abstract. This work aimed to evaluate the effect of different substrates and temperatures on the germination

of amarelão (Apuleia leiocarpa) seeds. It was used four types of substrates (between paper, over paper, paper

roll and sand) and five temperatures (constant: 20, 25, 30 and 35°C) and alternated (20/30°C). Germination

was evaluated daily after imbibition counting seeds with radicle protrusion of at least 2mm. It was calculated

the final percentage of germination and the indexes T50 and U7525 to estimate the speed and uniformity of

germination, respectively. It was not observed differences in the percentage of final germination between the

substrates in the temperatures of 25 and 30°C, However, when seeds were germinated at 30°C in paper roll

an increase in speed of germination (reduction of T50) was observed. Germination was not affected in the

tested temperatures, except for germination at 35°C, when a reduction in the percentage of final germination

was observed. However, despite the lack of effect of temperatures on the percentage of germination for the

majority of the tested temperatures, an effect on velocity and uniformity of germination was observed.

Higher speed and uniformity were achieved when seeds were incubated at 30°C. In conclusion, paper roll

and the temperature of 30°C (constant) are the best conditions for germination of A. leiocarpa seeds, which

provide higher percentage of germination, germination velocity and uniformity.

Keywords. Forest species, germination uniformity, speed of germination garapiá, grápia,

Resumo. Este trabalho teve como objetivos avaliar o efeito de diferentes substratos e temperaturas