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

Autor(es)

Fichino, Betania ; Fidelis, Alessandra ; Schmidt, Isabel ; Pivello, Vania

• Tipo de documento: Artigo Científico
• Fonte: Acta Botanica Brasilica; v. 26, n. 2, p. 4-pg., 2012-04-01.

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
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado