Germinação de sementes de Aspidosperma tomentosum Mart. (Apocynaceae) em diferentes temperaturas
2011; UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL; Volume: 9; Issue: 3 Linguagem: Inglês
ISSN
1679-2343
AutoresAdemir Kleber Morbeck de Oliveira, Jonatham Wesley Ferreira Ribeiro, Kelly Cristina Lacerda Pereira, Cássila Andréia Araújo Silva,
Tópico(s)Soil Management and Crop Yield
ResumoThe species Aspidosperma tomentosum is a tree belonging to the family Apocynaceae, distributed by Cerrado. Wood heavy, moderately resistant, is used in making furniture, decorative objects, and is considered medicinal. The aim of this study was to evaluate seed germination and initial radicle growth at different temperatures. The seeds were subjected to constant temperatures of 20, 25, 30 and 35°C and alternating, 20-30 and 25-35°C, with four replicates of 25 seeds per treatment (100 per test), germinated in transparent boxes in germination chambers, with photoperiod of twelve hours of white light. The statistical design was completely randomized and the averages compared by Tukey test at 5%. The results showed a higher percentage of germination at temperatures of 20, 25 and 25-35°C, reaching 100%, 91% and 91% respectively, indicating that these temperatures are more effective in promoting germination. But the largest vigor was found only in the temperature of 20oC with index of velocity of germination, 6.5 and average time of germination, 5.1 days. But the greater length of radicles was observed at temperatures of 25 and 30oC (20.6 and 23. 5 mm) and the allocation of dry mass, similar for all treatments, except 35°C, with less weight, indicating that this species has very specific requirements for its growth.
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