Germinação e armazenamento em sementes de Handroanthus impetiginosa (Mart. ex DC.) Mattos

Abstract

This study was conducted at the Seed Analysis Laboratory of the Federal University of Mato Grosso, campus of Sinop, in order to evaluate the germination and storage of seeds of purple ipe (Handroanthus impetinginosa). Therefore, collected seeds is in the municipality of Sinop - MT in 2015. The work was divided into two stages: first the seeds were submitted to germination test with four replications of 25 seeds each in gerbox boxes containing nutrient agar at temperatures ranging from 20ºC, 25ºC, 30ºC and 30/25 ° 12/12h photoperiod for determining the optimum temperature. For the realization of the second stage took data in the first. 2 treatments were divided in 4 replications of 25 seeds for the determination of the germ content in different containers (polyethylene and paper). The seeds contained in those packages were subjected to freezing condition in -21ºC temperature for 90 days in a conventional freezer. Later 90 days the seeds were submitted to germination tests at 30 ° C temperature (temperature obtained in the first step). The germinated seeds were counted daily for subsequent calculation of germination speed index (GSI) (procedure performed for both steps). A completely randomized design and the results were submitted to analysis of variance and test (Tukey at 5% probability) using the SISVAR Software 5.6 to compare the means of the variables percentage of germination and IVG. The seeds of purple ipe showed higher germination rates with the temperature 30 ° C and polyethylene packaging (99%). The storage in cold storage at -21ºC temperature for 90 days was effective to maintain its preservation of physiologic, thus being considered an orthodox species.