Viabilidade de embriões de macaúba [Acrocomia aculeata (Jacq.) Lood. Ex Mart.] e babaçu (Orbignya phalerata Mart.) em função da maturação e secagem dos frutos

• Ano de defesa: 2013
• Autor(a) principal: Rubio Neto, Aurélio
• Orientador(a): Pires, Larissa Leandro
• Banca de defesa: Sibov, Sérgio Tadeu, Seleguini, Alexsander, Pereira, Flávia Dionísio, Sales, Juliana de Fátima, Guimarães, Fabiano
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Agronomia (EAEA)
• Departamento: Escola de Agronomia e Engenharia de Alimentos - EAEA (RG)
• País: Brasil
• Palavras-chave em Português: Desidratação; Tolerância à dessecação; Micropropagação; Tetrazólio; Produção de mudas
• Palavras-chave em Inglês: Dehydration; Desiccation tolerance; Micropropagation; Tetrazolium; Seedling production
• Área do conhecimento CNPq: CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/3729

The objective of this study was to evaluate the physiological quality of embryos of babassu (Orbignya phalerata Mart.) and macaw palm [Acrocomia aculeata (Jacq.) Lood. Ex Mart.] according to the drying speed in order to optimize the already existing drying process as well as to propose a more efficient method for the in vitro establishment of macaw palm and babassu. It was observed that for both species under study, the temperature of 37±2°C promoted loss of water less than 57±2°C. However, it was more efficient because it did not inhibit the embryo during this process, ensuring high germination rates, even in seeds with 9% of water content for babassu and 19% for macaw palm. The adoption of the tetrazolium test, initially proposed for macaw palm, which uses salt at 0.5% and imbibition for 4 hours, allowed to distinguish different classes of vigor also in the babassu. Drying at 37°C favored the extraction of intact seeds and consequently the removal of embryo for in vitro culture of macaw palm. There was no difference in the in vitro germination of embryos extracted from fruit with different colors of the epicarp, which was approached as different maturity classes of macaw palm. The in vitro germination of embryos was enhanced with the addition of 30-40 g L-1sucrose in the culture medium. Thus, it is found that drying the fruit of babassu and macaw palm at 37°C ensures effectiveness in the process, since it allows better extraction of seeds or embryos which enable to achieve high in vitro germination rate within 60 days, making the time for production of seedlings much shorter.