A carregar...
Publicação
Impact of fire recurrence and induced water stress on seed germination and root mitotic cell cycle of Pinus pinaster aiton
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 2.44 MB | Adobe PDF |
Orientador(es)
Resumo(s)
Climate change will increase the frequency of drought, heat waves, and wildfires. We
intended to analyse how fire recurrence and/or induced water stress can affect seed germination
and root cell division in Pinus pinaster Aiton. Seeds from stands with no prior fire history and from
post-fire regeneration (in areas burnt once, twice, and thrice) in northern Portugal were germinated
in distilled water (control) and polyethylene glycol (PEG) to simulate water stress for four weeks,
followed by a recovery period. Roots were analysed cytogenetically. The germination index of the
Pinus pinaster seeds was not statistically influenced by the induction of osmotic stress, nor by the
fire recurrence of the stands. The mean germination time (MGT) was 10–29 days and 1–36 days
for the stress and recovery periods, respectively, and increased with PEG concentration. The 20%
PEG treatment inhibited root growth after germination. The 10% PEG treatment induced a high
frequency of cytogenetic anomalies, mostly in the sites which experienced fire exposure. While
fire recurrence did not affect the germination rate, it seemed to reduce the water stress response,
negatively impacting cell division and impair root growth
Descrição
Palavras-chave
cytogenetics drought germination mitosis polyethylene glycol maritime pine
Contexto Educativo
Citação
Ribeiro, S.; Gaspar, M.J.; Lima-Brito, J.; Fonseca, T.; Soares, P.; Cerveira, A.; Fernandes, P.M.; Louzada, J.; Carvalho, A. Impact of fire recurrence and induced water stress on seed germination and root mitotic cell cycle of Pinus pinaster aiton. Forests 2023, 14, 78
Editora
MDPI