LOPES, J. A.; LOPES, Joseudo Alves.
Resumo:
In the Caatinga, semi-arid region, the plants underwent physiological adaptations to
vegetation under conditions of high temperatures and water deficiency. In this region
are endemic species with potential still little studied. Among the species of timber and
ecological importance, there is Aspidosperma pyrifolium Mart., Popularly known as
Pereiro. The evaluation of the physiological quality of seeds can be performed
through feasibility tests such as germination test and tetrazolium test, and it is
necessary for Pereiro. The objective of this work was to evaluate the viability of
Aspidosperma pyrifolium seeds by standard germination and Tetrazolium tests. In
the first, the effect of substrates and temperatures on seed germination was tested,
totaling 15 treatments. Seed viability through the tetrazolium test was tested using
two soaking times (8 and 10 hours), two immersion times (3 and 6 hours) and
tetrazolium solution concentrations (0.075%, 0.5% and 1% ), Using a completely
randomized design, in the 2x2x3 factorial arrangement. In the germination test it was
observed that the paper roll and vermiculite substrates had a statistically equal
performance. The highest percentages of germination were obtained at constant
temperatures (25 and 30ºC) and alternated (25-30ºC). In the tetrazolium test, the
imbibition and concentration factors alone were decisive in the results. The imbibition
time of 10 hours presented better results, regardless of the immersion time and the
concentrations. The joint analysis of the studied factors shows the imbibition time of
10 hours with the solution concentration of 0.075% as ideal because it is more
economical. It was verified that both tests are efficient for evaluating the viability of
Pereiro seeds.
