Testes rápidos para avaliação da qualidade de sementes de girassol

• Ano de defesa: 2010
• Autor(a) principal: Caldeira, Carla Massimo
• Orientador(a): Carvalho, Maria Laene Moreira de
• Banca de defesa: Guimarães, Renato Mendes, Cícero, Silvio Moure
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: UNIVERSIDADE FEDERAL DE LAVRAS
• Programa de Pós-Graduação: DAG - Departamento de Agricultura
• País: BRASIL
• Palavras-chave em Português: Helianthus annuus L.; Germinação; Análise de imagem; Germination; Image analysis
• Área do conhecimento CNPq: CNPQ_NÃO_INFORMADO
• Link de acesso: https://repositorio.ufla.br/handle/1/4063

The sunflower (Helianthus annuus L.) is a potential crop for the use in biodiesel production, among other factors, for possessing high content of oil in seeds and ease of cold extraction. To ensure the stand establishment and high yield in the crop, the use of seeds of quality proven by fast and efficient methods is essential. However, in the literature few are the studies found for sunflower involving the use of tests to evaluate the quality of sunflower seeds. The test often used is that of germination which demands ten days for the obtaining of the results, according to the national and international rules of seed analysis. To check the possibility of reducing the evaluation time of the germination test of sunflower seeds, the substrates sand and paper and the constant temperatures 25 °C and 30 °C and the alternate ones 20-30 °C were tested. To estimate the vigor of sunflower seeds, the efficiency of the computerized system for seedling image analysis SVIS®, developed for soybean in comparison with the germination test and traditional tests of vigor evaluation, was verified. Evaluations were performed immediately after harvest and after storage under conventional storage conditions (25 ºC±2) for 4 months´ time. It follows that the finish of the germination test on the seventh day after sowing and that the use of the substrate sand at the temperature of 25 °C are conditions adequate for evaluation of sunflower seed germination. The computerized analysis of images of seedlings coming from the germination test with use of the SVIS® software, developed for soybean, not always presents results consistent with the traditional tests, that is, the response of the evaluation of vigor by the program depends on the cultivar used and on the characteristics of the lot such as its sanity.