Teste de condutividade elétrica em sementes de Monjoleiro (SENEGALIA POLYPHYLLA (DC.) BRITTON & ROSE) classificadas por tamanho

• Autor(a) principal: Nemoto, Julia Marques
• Data de Publicação: 2021
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/216416
• topic: Florestais; Sementes -fisiologia; Testes; Controle de qualidade

Seed technology has sought to improve the procedures for evaluating the quality of seeds, with the improvement of achieving results that show the potential performance of a lot, highlighting, in particular, studies related to vigor tests. In this work the aim of this study was to evaluate the physiological quality of Senegalia polyphylla (monjoleiro) seeds by electrical conductivity test. Seeds of six size classes, according to retention in a set of round sieve sieves of sizes <15, 15, 16, 17, 18 and >18, had their water content determined and were subjected to germination and conductivity tests electrical (CE). The germination test was carried out at 25 oC and 12h photoperiod, in a completely randomized design (DIC) with 5 replicates of 25 seeds per treatment. The CE test was conducted at 20 and 25 oC, with seeds soaked in 75 and 100 ml of deionized water for 10 periods (2, 4, 6, 8, 10, 12, 24, 48, 72 and 96h). This experiment was conducted in DIC, for each temperature, with six replications of 25 seeds per treatment, in a split-plot scheme, with the plots consisting of a 2 x 6 factorial (2 soaking volumes and 6 seed size classes) and the subplots by periods of imbibition. Data were subjected to analysis of variance, followed by comparison of means by Tukey test or polynomial regression analysis. Smaller seeds (P<15) have lower physiological quality than the others. EC increases with increasing seed temperature and soaking period and decreases with increasing soaking volume and seed size. The 24-hour period, regardless of the soaking volume at 20 oC, allowed the separation of seed lots at vigor levels compatible with the germination test.