Produção Nacional
Períodos de estratificação na germinação de sementes de alface (Lactuca sativa L.) sob diferentes condições de luz e temperatura
2012; UNIVERSIDADE ESTADUAL DE LONDRINA; Volume: 33; Issue: 3 Linguagem: Inglês
10.5433/1679-0359.2012v33n3p931
ISSN1679-0359
AutoresJennifer Búfalo, Amanda Cristina Esteves Amaro, Humberto Sampaio Araujo, Jaqueline Malagutti Corsato, Elizabeth Orika Ono, Gisela Ferreira, João Domingos Rodrigues,
Tópico(s)Soil Management and Crop Yield
ResumoLettuce seeds have a high sensitivity to variations in humidity and temperature of the environment where they germinate, therefore, studies with the aim of improve the germination and physiological performance of these have been conducted. Thus, the study aimed to evaluate the efficiency of pre-germination treatment stratification (5 °C) for different periods, and increase the uniformity of germination of lettuce seeds submitted to different conditions of light and germination temperatures. In the pre-germinative treatment, the seeds of lettuce (Lactuca sativa L.) var. American Great Lakes were placed in plastic boxes dark of the type "gerbox" and subjected to temperature stratification of 5 °C and the dark for 4, 8, 12 and 16 hours. After periods of stratification the seeds were submitted to germination tests which were transferred to plastic boxes type "gerbox" transparent (constant light) and dark (no light) and were maintained in a germination chamber B.O.D with light constant at temperatures of 20, 25, 30 and 35°C. The design used was the entirely randomized with four repetitions, in a factorial outline 5x4x2, five pre-germinative treatments, four germination temperatures and two light conditions. Stratification for 16 hours and temperatures of 20 and 25 °C stimulated the germination of lettuce seeds, providing a higher germination percentage, germination speed index and minor mean germination time. The presence of light resulted in increased germination at 0, 4, 8 and 12 hours of stratification.
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