Maturação fisiológica de sementes de Luffa operculata (L.) Cogniaux

• Ano de defesa: 2016
• Autor(a) principal: Araujo, Paulo Costa
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraíba; Brasil; Ciências Fitotecnia e Ciências Ambientais; Programa de Pós-Graduação em Agronomia; UFPB
• Palavras-chave em Português: Cabacinha; Germinação; Dormência tegumentar; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/123456789/14533

Luffa operculata (Cucurbitaceae) is a native plant in Brazil and often occurs in some states of the north and northeast, whose fruits are rich in some active principles such as isocucurbitacina and buchinina, which are effective in treating some diseases, particularly respiratory, as sinusitis and rhinitis. The principal way of spreading this Cucurbitaceae is through its seeds, which should have high physiological quality for the maximum germination occurs, so that the period of physiological maturity point becomes extremely important. Given these considerations above, this study aimed to evaluate the physical and physiological changes in fruits and seeds of Luffa operculata harvested in 2013 and 2014 with different maturity stages, to identify the physiological maturation point of seeds and detect the time when these become dormant. The experiment was conducted in the experimental field of the horticulture sector and the physical and physiological tests at the Laboratory of Seed Analysis (LAS), both belonging to the Center of Agricultural Sciences of the Federal University of Paraíba (CCA-UFPB), in Areia - PB. To determine the physiological maturation point of seeds it was evaluated the water content and size of fruits and seeds and also the external color of the fruit, also it was evaluated the germination and vigor tests (percentage, first count and germination speed index, length and dry mass of the hypocotyl and roots of the seedlings). The experimental design was completely at random and evaluated factors consisted of seeds with and without lopping and also the days after anthesis. The highest percentage of germination occurred at 45 and 42 days after flowering to seed lopped or not, respectively, in 2013; while the following year was at 35 and 29 days the seeds with and without lopping respectively. The size of the fruits is not a appropriate index for determining the maturity point. L. Operculata seeds should be harvested between 50 and 60 days after anthesis, however it is recommended that they be submitted to the lopping of the integument since cutaneous dormancy impedes the germination.