Teste de Condutividade Elétrica em Lotes de Sementes de Schinus molle L.

Abstract

RESUMOEste experimento objetivou avaliar a eficiência do teste de condutividade elétrica para determinar a qualidade fisiológica de lotes de sementes de Schinus molle. No estudo foram utilizados três lotes de sementes armazenados por diferentes períodos (1, 8 e 12 meses), avaliando-se duas quantidades de sementes (50 e 100) e três volumes de água (25, 50 e 75 mL) para obtenção da solução de embebição e posterior leitura da condutividade elétrica. Foi realizado também o teste de germinação para melhor interpretação dos resultados. Observou-se que os três volumes de água permitiram diferenciar os três lotes para as duas quantidades de sementes utilizadas. O lote com menor período de armazenamento apresentou os menores valores de condutividade elétrica, apresentando melhor qualidade fisiológica e confirmando os resultados do teste de germinação. O teste de condutividade elétrica mostrou-se eficiente para a diferenciação de lotes de sementes de Schinus molle, podendo ser conduzido a 25 °C, com o uso de 50 sementes embebidas em 25 mL de água por 24 horas.Palavras-chave: aroeira, testes de vigor, sementes florestais. Electrical Conductivity Test in Batches of Schinus molle L. Seeds ABSTRACTThe objective of this study was to evaluate the efficiency of the electrical conductivity test to determine the physiological characteristics of lots of Schinus molle seeds. In the test, we used three lots of seeds stored for different periods of time, and evaluated two quantities of seeds and three volumes of water to obtain the soaking solution for subsequent reading of electrical conductivity. For conductivity, three volumes of water showed evidence of differences between the three lots for the two quantities of seeds. The lot with shorter storage period presented the lowest electrical conductivity and better physiological quality, confirming the results of the germination test. Thus the electrical conductivity test is efficient in differentiating batches of Schinus molle seeds, and it can be conducted at 25 °C, using 50 seeds soaked in 25 mL of water for 24 hours.

PHYSIOLOGICAL AND BIOCHEMICAL CHANGES IN BRAZILIAN PEPPER (Schinus terebinthifolius Raddi) SEEDS DURING STORAGE

“…Corte et al (2010) reported a decrease from 97 to 57% in the viability of Melanoxylon brauna seeds during storage, which corresponded to a concomitant increase in conductivity. Likewise, electrical conductivity was an efficient indicator of Schinus molle seed quality (Delazeri et al, 2016). In this species, samples with shorter storage times had higher germination percentage and lower conductivity.…”

Análise de sementes de Lupinus albescens Hook. & Arn

“…According to the results of seed imbibition analysis for 96, 120 and 144 hours, the electrical conductivity test evidenced a higher volume of leached solutes at the beginning of the storage of seeds wrapped in a plastic zip lock bag stored in the refrigerator. According to Silva et al (2014b) and Delazeri et al (2016), the high volume of solute leached in the solution, and consequently the high electrical conductivity value, are directly related to a lower seed vigor. On the other hand, from 30 days, as the electrical conductivity contents decrease, we verified an increase in the vigor of seeds stored in laboratory and in refrigerator, that is, an increase in the percentage of germination.…”

Electrical Conductivity Test for Measurement of White Clover Seeds Vigor

“…The germination test is routinely carried at undertaking producing seeds laboratories, in order to evaluate the seed lots quality. However, laboratory testspresent ideal conditions (Delazeri et al, 2016;Rigo et al, 2018), differently from what occurs on the field when seeds are planted, where conditions may be adverse, revealing inferior germination rates (Grzybowski et al, 2015;Gehlling et al, 2018).…”