Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Effects of high temperatures on the germination of Syngonanthus nitens seeds: implications for management

Texto completo
Autor(es):
Fichino, Betania ; Fidelis, Alessandra ; Schmidt, Isabel ; Pivello, Vania
Número total de Autores: 4
Tipo de documento: Artigo Científico
Fonte: Acta Botanica Brasilica; v. 26, n. 2, p. 508-511, APR-JUN 2012.
Citações Web of Science: 11
Resumo

(Effects of high temperatures on the germination of Syngonanthus nitens seeds: implications for management. This study aimed to assess the effects of fire on germination of golden-grass (Syngonanthus nitens (Bong.) Ruhland, Eriocaulaceae) seeds. Seeds collected in Jalapao (Tocantins, Brazil) were exposed to heat shock treatments at 60 degrees C, 100 degrees C, 150 degrees C and 200 degrees C, for 1; 3; and 5: For each treatment and control five replications were used (20 seeds each). Seeds were put on Petri dishes and placed inside germination chambers set at 28 degrees C, 12h/12h, for 40 days. Germination rates were analyzed by two-factorial ANOVA, using randomization tests. Most treatments showed high germination rates (>85%), except for 200 degrees C/3' (50%), and 200 degrees C/5, which showed germination rates that were significantly lower (4.5%, P<0.05). The results indicated that S. nitens seeds were not stimulated or killed by high temperatures, except when an extreme temperature and time of exposure were combined (200 degrees C/5'). When wet grasslands burn, where S. nitens grows, the fire passes very quickly over the area and the temperature during the fire may not exceed 150 degrees C. Under these conditions, our results suggest that S. nitens seeds can potentially survive most fires. These findings are essential for making management recommendations for this species, which has high commercial value. (AU)

Processo FAPESP: 08/10049-9 - Efeitos do fogo na dinâmica da vegetação campestre do cerrado no Parque Estadual do Jalapão: uma abordagem funcional
Beneficiário:Alessandra Tomaselli Fidelis
Linha de fomento: Bolsas no Brasil - Pós-Doutorado