298 resultados para Quebra de dormência


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Annonaceae seeds are known by presenting dormancy mechanisms, whose reports ranging from coating impermeable to the physiological dormancy. By this way, the present study aimed to evaluate water uptake in Annona diversifolia Saff and Annona purpurea Moc & Sessé ex Dunal seeds. For this study, seeds were placed under immersion in distilled water, and used four replicates of 25 seeds of each species, which were weighed during the 480 hours that were immersed. To determine the place of purchase of water, Annona diversifolia seeds were sealed with paraffin at different locations. Based on the results, seeds from both species reached the phases I and II of water uptake, which indicates they are not hard; however, germination (Phase III) was not reached. Annona diversifolia seeds completed Phase I with, 50h and Annona purpurea with 70h from imbibitions begin, which shows that even slowly, water is acquire.

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Populations of carrot seeds with superior physiological quality and storage potential are of interest to seed companies and growers. Thus, we verified the efficiency of some tests for the selection of carrot populations with greater vigor and longevity of seeds. Seeds of 50 carrots progenies of different half-brothers from Brasilia cultivar were evaluated for the mass of one hundred seeds, the first count, germination, dormancy, accelerated aging with water and saturated NaCl solution. The seeds were stored at moisture contents of 6.1±0.3% in hermetic packaging at temperatures of 15 and 25°C for 12 months and germination was evaluated quarterly. The experimental data were evaluated for variance and phenotypic, genotypic and environmental heritability, coefficient of variation and genetic gain from selection. Selection based on the mass should not be used because it would increase the occurrence of dormancy in seeds of the next generation. The test of the first count, germination and accelerated aging in water or saline solution saturated may be used to select populations of carrot seeds of higher vigor and longevity. The estimated gain genetic selection for germination after 12 months storage at 25°C was 14%.

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Pós-graduação em Engenharia Elétrica - FEIS

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Pós-graduação em Serviço Social - FCHS

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Pós-graduação em Ciência dos Materiais - FEIS

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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The school participation is a prerequisite for the construction of knowledge, learning and development. Neurological deficits may affect child's ability to explore the environment and engage in typical activities. Considering the importance of encouraging professionals in the field of education to conduct simple adjustments in school activities of daily life, this study aimed to adapt, with low cost materials, resources of entertainment and educational for children with neuromotor disorders . It was objects of this study eight resources prescribed and designed for three children diagnosed with cerebral palsy: domino, puzzle, memory game, moving magnetized alphabet, crossword, doll body scheme, adaptation of pencils for writing and bracelet sinker.The analysis of these resources occurred in the parameters of conventional design and management skills, followed by identifying the limiting conditions of the motor skills of the cases observed, indicating the materials used in the adaptation and possible uses. This study provides subsidy for implementation of teaching strategies in the care of students with neuromotor disorders.

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Pós-graduação em Educação Escolar - FCLAR

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Pós-graduação em Física - FEG

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Física - FEG

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Pós-graduação em Ciência e Tecnologia de Materiais - FC