Dynamics of seeds germination of imbuya (Ocotea porosa Nees et Martius ex. Nees, Lauraceae ) progenies within populations of Paraná and Santa Catarina

Abstract

Imbuya (Ocotea porosa Nees et Martius ex. Nees, Lauraceae) is a species menaced of extinction. In 2003, Embrapa Florestas began a program for its conservation exsitu collecting germplasm at Colombo, Bocaiuva - Paraná state, Canoinhas and Caçador - Santa Catarina state, Brazil. Seeds were immersed in sulphuric acid 70% against dormancy of tegument. Low germination index were obtained, varying from 9,70% to 18,19% (june-october, 2003) due to the sulphuric acid. Inversely, seeds from Bocaiuva and Caçador not submitted to the treatment with sulphuric acid presented germination of 47% and 71%, respectively for these localities. Germination along this period increased from the 6th to the 7th month after sown. Beginning of germination occurred until 200 days after sown, varying considerable between progenies and provenances, showing that selection of progenies with high germination and capable to germinate until 100 days after germination will be important.