Efeito da secagem e de diferentes temperaturas na germinação de sementes de Protium widgrenii Engler

Abstract

Protium widgrenii Engler (Burceraceae) known as "almecega-vermelha", is a native species that occurs in many forest formations Minas Gerais to Rio Grande do Sul and is considered usefull in mixed plantings used for restoration of depleted areas of permanent preservation. The objective of this work was to study the effect of dessecation and the different termic regimes on seed germination. Were used seed with initial humidity of 51% and seeds dessecated until 13% humidity, were submitted to a cold pre-treatment (5ºC/24 hours) and distributed in three rolls of germtest paper and maintained in a germination chamber, type BOD under different temperatures (15, 25, 35ºC constant, dark and 30-20ºC, Day/Night. Seeds with 51% humidity presented higher and lower germination at 25ºC and 35ºC and higher and lower IVG at 25ºC and 15ºC, respectively. Using dessecation at 13% humidity, the seeds at 15ºC showed the lowest IVG and germination. Final germination percentage at 15ºC was higher in seeds with 51% humidity and lower IVG at 25ºC in desseccted seeds.