| Texto completo | |
| Autor(es): |
Zirondi, H. L.
;
Ooi, M. K. J.
;
Fidelis, A.
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Plant Biology; v. 26, n. 6, p. 11-pg., 2024-06-28. |
| Resumo | |
In fire-prone ecosystems, plant traits are influenced by the fire regime, thus reproduction and establishment can be altered by this disturbance. Changes in fire frequency and history can therefore influence seed and germination traits. We investigated the effects of short-term fire exclusion on seed and germination traits of species from tropical open savannas. Seeds from 27 species were collected from two areas with distinct fire histories: recently and frequently burned (RB) or unburned for 5 to 7 years (E). Seeds from both areas underwent germination trials under optimal conditions for 30 days. Also, 10 species were exposed to high temperature treatments (100 or 200 degrees C) and seed and germination traits measured. Comparisons were then made for each trait, analysing each species separately, between the two areas. Approximately 85% of species studied had at least one of their germination traits altered in the RB area compared to the E area. Clear differences included lower viability and faster germination in seeds from RB areas. Seed traits of 70% of measured species differed between the two areas. Our results show species-specific trait response to different fire histories. For example, faster germination and lower viability of seeds from RB plots suggest selection for faster maturing individuals and differences in resourcing, respectively, under a regime of frequent fire. This study provides insights into fire effects on regeneration responses of tropical savanna species and also points to the need for more studies evaluating the effects of fire history on seed traits. Our results show Cerrado species-specific trait responses to different fire regimes, including alterations in seed and germination traits after short-term fire exclusion. image (AU) | |
| Processo FAPESP: | 15/06743-0 - Como a época do fogo afeta a vegetação do cerrado? |
| Beneficiário: | Alessandra Tomaselli Fidelis |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |
| Processo FAPESP: | 19/09903-0 - Atributos adaptativos ao fogo de sementes de espécies do cerrado |
| Beneficiário: | Alessandra Tomaselli Fidelis |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 18/08017-3 - Atributo de sementes em ecossistemas inflamáveis |
| Beneficiário: | Heloiza Lourenço Zirondi |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Mestrado |
| Processo FAPESP: | 17/16149-4 - O efeito do fogo na fenologia, atributos de sementes e germinação de espécies de cerrado |
| Beneficiário: | Heloiza Lourenço Zirondi |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |