Testes para avaliação da qualidade fisiológica de sementes de pinhão manso (Jatropha curcas L.)

• Ano de defesa: 2009
• Autor(a) principal: Oliveira, Glauter Lima
• Orientador(a): Dias, Luiz Antonio dos Santos
• Banca de defesa: Alvarenga, Antônio de Pádua , Araújo, Roberto Fontes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Fitotecnia
• Departamento: Plantas daninhas, Alelopatia, Herbicidas e Resíduos; Fisiologia de culturas; Manejo pós-colheita de
• País: BR
• Palavras-chave em Português: Pinhão manso; Jatropha curcas L.; Germinação; Envelhecimento acelerado
• Palavras-chave em Inglês: Pinhão manso; Jatropha curcas L.; Germination; Accelerated aging
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA::PRODUCAO E BENEFICIAMENTO DE SEMENTES
• Link de acesso: http://locus.ufv.br/handle/123456789/4514

The use of good quality seeds in the current agricultural scenery is without a doubt an important, if not, the most important factor to obtain the success desired for any cultivated crop. Therefore, starting from this point, this research had as objectives to establish appropriate methodology to the germination test in seeds of pinhão manso, with views to its validation and inclusion in the RAS, besides trying the to adjust a methodology for the accelerated aging test for the evaluation of pinhão manso seeds vigor. For so much two experiments were conducted for 18 months in the routine laboratory in seeds of the Federal University of Viçosa seeking to reach the proposed objectives. The first experiment to be accomplished was the adjustment of the methodology for the germination test, where four lots of pinhão manso seeds obtained in different harvested times, this seeds were treated with fungicidal product and submitted to the germination in different substrates (sand and paper) and temperatures (20, 25, 30 and 20-30ºC). Daily counting of the number of normal seedlings obtained during the period of the experiment were made in order to establish the best time to carry out the first and final counting. The completely randomized design with four replicates in a subdivided plot design was adopted to carry out the experiment, comparing the means obtained with the treatments by the test of Tukey at level of 5% of probability. In the second experiment were also used four lots of seeds of pinhão manso obtained from parceled harvests, demonstrating high initial germination, where these lots were submitted to the following tests: germination, first germination count, germination at low temperature, cold test in paper towel (10ºC/7 days and 25ºC /5 days) and percentage and index of emergency, besides the accelerated aging test at 100% UR in the temperatures of 42 and 45ºC for 48, 72 and 96 hours. It can be concluded with this work that both substrates used to the germination test can be adopted to conduct the test. The temperatures that best expressed the germination potential in seeds of pinhão manso were the 25 and 30ºC, and best period to carry out the of the first and final germination count are at seven and 12 days after the begin of the test. The best combination found to conduct the accelerating aging test is conducting at 42ºC for 48 hours, and when the seeds were exposed to the temperature of 45ºC for 96 hours it caused deterioration of the seeds, making it unviable to the classification in levels of vigor.