Teste de envelhecimento acelerado em sementes de aveia preta

Abstract

sódio (NaCl), visando identificar o período de exposição e a temperatura para a classificação dos níveis de vigor de lotes dessas sementes. Foram utilizados cinco lotes de sementes, nos quais foram realizados testes para a caracterização da qualidade inicial de lotes (germinação, emergência de plântulas, condutividade elétrica, o comprimento de plântulas normais e massa de 1000 sementes), e estudado o envelhecimento acelerado tradicional (com água), com e sem tratamento fungicida, e o envelhecimento acelerado com solução saturada de sal (NaCl) por períodos de 24, 48, 72, 96 e 120 horas de condicionamento às temperaturas de 40, 43 e 45 o C. O teste de envelhecimento acelerado é adequado para estimar o vigor de sementes de aveia preta pelo procedimento tradicional (com e sem tratamento fungicida) ou com solução saturada de sal, ambos a temperatura de 40ºC por 24 horas.Termos para indexação: vigor, qualidade fisiológica, Avena strigosa Schreb. ACCELERATED AGING TEST IN BLACK OAT SEEDSABSTRACT -The present work had as its objective to study the traditional method of accelerated aging (with water), in black oats seeds with and without fungicid treatment, and the accelerated aging with saturated solution of salt (NaCl), by aiming to identify the exposition period and temperature that allow the classification of lots of black oats seeds in different vigour levels. The study was carried out by using five lots of black oats seeds. Tests were carried out to characterization of initial quality of the seed lots (tests of germination, seedlings emergency in the field, electrical conductivity, length of normal seedlings and mass of 1000 seeds) and the studies of accelerated aging consisted the traditional method (with water), with and without fungicid treatment, and accelerated aging with saturated solution of salt (NaCl) for periods of 24, 48, 72, 96 and 120 hours, conditioning at temperatures of 40, 43 and 45 o C. The studies concluded that the test of accelerated aging is adequated to evaluate the vigor of black oats seeds using the test of traditional accelerated aging (with and without treated seeds) or with saturated solution of salt, both at 40 o C during 24 hours.

Assessment of Seed Vigor Tests for Crambe abyssinica

“…The use of high quality seeds has a great importance to ensure a successful stand establishment. Seed vigor affects not only the stand establishment, but also has influences in plant growth, development and productivity (Souza et al, 2009). Thus, vigor tests evaluate seed behavior under adverse conditions and reflect more accurately field emergence potential, unlike germination test that provides light, temperature and humidity optimum conditions.…”

Foliar fungicide and environments on the physiological quality of oat seeds

“…Garcia and Menezes (1999), working with seeds of ryegrass, black oats and millet, observed that seed with low vigor have greater reduction of viability when subjected to conditions of high temperature and humidity, while more vigorous seeds usually retain their ability to produce normal seedlings and have high germination after being subjected to aging. According to the results observed by Souza et al (2009), who used the accelerated aging test to estimate the vigor of lots of black oats seeds, the germination percentage remained high within the commercial standards, ie, above 75%. This fact is extremely important, since one of the objectives of the test is to identify significant differences in the physiological quality of marketable lots, especially among those with similar germination.…”

New Vigor Methodology in Pearl Millet Seeds

“…The seed lots with the lowest vigor were 3 and 4. Souza et al (2009) stated that AA is the most drastic vigor test because of the increase in water content during the exposure period where water imbibition by the seed occurs at different speeds causing a great stress, that is, seed metabolism is exposed to high temperature and humidity.…”