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ResumoA utilização de inseticidas no tratamento de sementes cresce a cada safra em decorrência do ataque progressivo de diferentes espécies de insetos-pragas. O objetivo deste trabalho foi avaliar a influência do fipronil e tiametoxam no desempenho fisiológico das sementes de soja sob armazenamento. O delineamento experimental utilizado foi inteiramente casualizado com quatro repetições, distribuído em esquema fatorial (4 x 3 x 2), utilizou-se quatro cultivares (BMX MAGNA RR, BMX Potência RR, NK 3358 RR e NK 7059 RR), três tratamentos de sementes (fipronil e tiametoxam e uma testemunha sem inseticida), em dois períodos de armazenamento (zero e 180 dias após a colheita). A qualidade fisiológica das sementes foi avaliada pelos testes: germinação (primeira contagem e contagem final), envelhecimento acelerado, frio modificado, comprimento de plântula e raiz. Diante dos resultados obtidos, pode-se inferir que os inseticidas fipronil e tiametoxam influenciam negativamente a qualidade fisiológica das sementes de soja submetidas ao armazenamento por 180 dias. Os inseticidas após o período de armazenamento afeta negativamente o comprimento de raiz.Palavras-chave: germinação; Glycine max; inseticidas; vigor.

-The objective of this study was to evaluate physiological quality, content, and activity of antioxidants, in soybean seeds subjected to accelerated aging during different periods. Seeds of cultivars BRS 258, BRS 262 and BRS 268, subjected to accelerated aging during 12, 24, 36 and 48 hours and non-aged seeds were used. After each aging period, the seed were evaluated by tests of: germination; first count and tetrazolium. The total of phenolic compounds, total flavonoides, total of isoflavones, and activity for eliminating ABTS•+ radicals were quantified. There were differences among cultivars according to vigor and viability only after seeds were aged. Cultivars BRS 158 and BRS 268 have shown better seed physiological quality in each aging period; however, not presenting higher amounts of isoflavones and efficiency in removing free radicals. For all cultivars, the values for total of phenolic compounds, as well as total of flavonoids have shown quadratic positive behavior; the values for isoflavones remained constant and the vigor and viability showed contrary trend to activity of antioxidant agents.

-The objective in this research was to evaluate the isoflavone content and the physiological quality of seed from conventional and transgenic soybean cultivars before and after 180 days of storage. Twenty one soybean cultivars: CD 202, CD 206, CD 208, CD 213RR, CD 214RR, CD 215, CD 216, CD 217, CD 218, CD 221, BRS 184, BRS 185, BRS 214, BRS 244RR, BRS 245RR, BRS 246RR, BRS 255, BRS 257, BRS 258, BRS 261 and BRS 262, grown in the 2005/2006 crop season, were assayed. The seeds were packed in Kraft paper bags and stored at room temperature under laboratory conditions. Seeds were evaluated with respect to their germination and vigor (first germination count, accelerated aging and tetrazolium test) and their total isoflavone contents and respective aglycon forms (daidzein, genistein and glycitein),glycosides (daidzine, genistine and glycitine) and malonyl conjugates. A completely randomized block design with six replications with the treatments set out within a subplot scheme (21 cultivars x 2 storage periods) was used. The F-test was used to compare means between storage periods and the Scott-Knott test to compare cultivars for each storage period, both with a 95% probability. It was concluded that isoflavone contents differ between cultivars and show a distinct behavior throughout storage. isoflavonas totais e suas respetivas formas agliconas (daidzeína, genisteína e gliciteína), glicosídeos (daidzina, genistina e glicitina) e seus conjugados malonil. O delineamento experimental utilizado foi o inteiramente casualizado com 6 repetições e tratamentos dispostos no esquema de parcelas subdivididas (21 cultivares x 2 tempos de armazenamento). Para a comparação de médias entre tempos de armazenamento, utilizou-se o teste F e para comparações de cultivares para cada tempo de armazenamento utilizou-se o teste de agrupamento de Scott-Knott, ambos com 95% de probabilidade. Pelos resultados foi possível concluir que os teores de isoflavonas diferenciam-se entre as cultivares e possuem comportamento distinto ao longo do armazenamento.Termos para indexação: agliconas, Glycine max, daidzina, genistina, vigor.