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Previous issue date: 2007-06-11 === O trigo é uma gramínea, cujas sementes apresentam alta germinação. Estes trabalhos tiveram como objetivo estudar a germinação, o vigor e o armazenamento de sementes de trigo. No estudo do envelhecimento acelerado e experimento foi conduzido no delineamento experimental inteiramente casualizado, com quatro repetições de 25 sementes. Foram avaliadas as temperaturas (41, 43, 45ºC) e o período de exposição adequado (zero, 24, 48, 72 e 96 horas) para a avaliação de sementes de trigo da cultivar Aliança. Conclui-se que: o envelhecimento acelerado de sementes de trigo na
temperatura de 41 °C e tempos de exposição de 24 e 48 horas são os mais indicados; sob temperatura de 43 °C recomenda -se utilizar 24 horas de exposição das sementes;
a temperatura de 45 °C é letal. No capítulo dois com o objetivo de avaliar a qualidade fisiológica das seis cultivares de trigo o experimento foi conduzido em delineamento
experimental inteiramente casualizado, com quatro repetições de 50 sementes, em esquema fatorial 6x3x7, sendo seis cultivares de trigo (Timbaúva, CPAC 98308, CPAC 96306, CPAC 9617, Aliança e PF 950407) x três tipos de embalagens (pano, plástico e papel) x sete períodos de armazenamento (zero, dois, quatro, seis, oito, dez e doze meses). No armazenamento, foram avaliados os tipos de embalagens, a emissão da raiz primária com 2 mm de comprimento e o desenvolvimento da radícula para eixos embrionários, em seguida analizou-se a massa seca das plântulas. Conclui-se que: As sementes de trigo da cultivar CPAC 98308 apresenta boa armazenabilidade nas condições do município de Ibitirama; a perda da capacidade germinativa das sementes das seis cultivares se dá após seis meses nas embalagens de pano e papel e aos oito meses na embalagem plástica; a redução da qualidade fisiológica das seis cultivares de trigo tem início a partir do quarto mês de armazenamento nas embalagens de pano e papel e a partir do sexto mês na embalagem plástica; a deterioração foi verificada nas sementes da embalagem de pano aos oito meses, na de papel aos seis meses e na
embalagem plástica aos doze meses. === The wheat is a grassy one, whose seeds present high germination. These works had had as objective to study the germination, the vigor and the storage of wheat seeds.
In the study of the accelerated aging and experiment casualizado was lead in the completely randomized design, with four replications of 25 seeds. The temperatures (41,
43, 45ºC) and the adequate period of exposition (zero, 24, 48, 72 and 96 hours) for the evaluation of seeds of wheat of cultivating had been evaluated Alliance. One concludes
that: with the accelerated aging of seeds of wheat in the Temperature of 41°C for periods of 24 and 48 hours of treatment were the more indicated for the wheat aging;
under temperature of the 43°C was recommended 24 hour s of exposition. Treatment of the seeds with accelerated aging using temperature of 45ºC determined the death of the
seeds, culminating with deterioration. In chapter two with the objective to evaluate the physiological quality of the six to cultivate of wheat the experiment was lead in experimental completely randomized design, with four repetitions of 50 seeds, in factorial project 6x3x7, being six to cultivate of wheat (Timbaúva, CPAC 98308, CPAC 96306, CPAC 9617, Alliance and PF 950407) x three types of packings (cloth, plastic and paper) x seven periods of storage (zero, two, four, six, eight, ten and twelve months). In the storage, the types of packings, the emission of the primary root with 2
mm of length and the development of radicule for axles had been evaluated embryonic, after that it was analysis dry mass of seedlings. One concludes that: the seeds wheat of
cultivating CPAC 98308 present good storage in the conditions of the city of Ibitirama; the loss of the germinative capacity of the seeds of the six after to cultivate if it gives to
six months in the packings of cloth and paper and to the eight months in the plastic packing; the reduction of the physiological quality of the seeds of the six to cultivate of
wheat has beginning from the sixth month and in the plastic packing; deterioration was verified in the seeds of the cloth packing to the eight months, in the one of paper to the
six months and in the plastic packing to the twelve months.
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