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Seed germination ecophysiology of the wild pineapple, Ananas ananassoides (Baker) L.B.Sm. (Bromeliaceae) Ecofisiologia da germinação de sementes do ananás, Ananas ananassoides (Baker) L.B.Sm.(Bromeliaceae)

By Fernando Augusto Oliveira Silveira, Jean Carlos Santos and Geraldo Wilson Fernandes


In this study we investigated the effects of light, temperature, and storage on seed germination of the wild pineapple Ananasananassoides, an understorey species found in cerrado woodlands. Seeds were germinated at temperatures of 15, 20, 25, 30 and 35 ºC and a 12-hr photoperiod and continuous darkness for 30-d. Seeds were photoblastic and the optimum temperatures for germination were 25 and 30 ºC. Seeds stored for 12-mo at room temperature and at 4 ºC were set to germinate at optimum conditions. Germinability of stored seeds did not differ from that of recently collected seeds, regardless of storage temperature, indicating their physiological potential for seed bank formation. Our results suggest that as in tropical rainforests, light may be an important factor controlling recruitment from seed banks for small-sized species from the cerrado woodlands.<br>Neste estudo foram investigados os efeitos da luz, temperatura e armazenamento na germinação de sementes do ananás, Ananasananassoides, uma bromélia de sub-bosque de cerradão. As sementes foram submetidas aos testes nas temperaturas de 15, 20, 25, 30 e 35 ºC em fotoperíodo de 12 horas e escuro contínuo por 30 dias. As sementes foram consideradas fotoblásticas e as temperaturas ótimas para germinação foram 25 e 30 ºC. Sementes armazenadas por 12 meses a temperatura ambiente e a 4 ºC foram colocadas para germinar nas condições ótimas e apresentaram germinabilidade e tempo médio de germinação similares à sementes recém-coletadas independente da temperatura de armazenamento, demonstrando potencial fisiológico para formação de banco de sementes. Os resultados sugerem que de forma similar às florestas tropicais, a luz pode ser um importante fator que controla o recrutamento de plântulas a partir do banco de sementes para espécies de sementes pequenas de cerradão

Topics: armazenamento, banco de semente, Cerrado, fotoblastismo, recrutamento, Cerrado, photoblastism, recruitment, seed bank, seed storage, Botany, QK1-989, Science, Q, DOAJ:Botany, DOAJ:Biology, DOAJ:Biology and Life Sciences
Publisher: Sociedade Botânica do Brasil
Year: 2010
DOI identifier: 10.1590/S0102-33062010000400026
OAI identifier: oai:doaj.org/article:d05a1866fe7c4ed2b3ad326dc780bf2d
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