2016
DOI: 10.1590/0102-33062016abb0246
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The effect of simulated heat-shock and daily temperature fluctuations on seed germination of four species from fire-prone ecosystems

Abstract: Seed germination in many species from fi re-prone ecosystems may be triggered by heat shock and/or temperature fl uctuation, and how species respond to such fi re-related cues is important to understand post-fi re regeneration strategies. Th us, we tested how heat shock and daily temperature fl uctuations aff ect the germination of four species from fi re-prone ecosystems; two from the Cerrado and two from the Mediterranean Basin. Seeds of all four species were subjected to four treatments: Fire (F), temperatu… Show more

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Cited by 18 publications
(12 citation statements)
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“…S1), supporting the explanation of sensitivity cycling to physical dormancy breaking. Zupo et al 29 also found that seeds of C. albidus exposed to fire plus summer temperatures decreased germination in comparison to seeds only exposed to fire, but results were not explained. Probably, their results can also be explained in terms of sensitivity cycling.…”
Section: Discussionmentioning
confidence: 96%
See 1 more Smart Citation
“…S1), supporting the explanation of sensitivity cycling to physical dormancy breaking. Zupo et al 29 also found that seeds of C. albidus exposed to fire plus summer temperatures decreased germination in comparison to seeds only exposed to fire, but results were not explained. Probably, their results can also be explained in terms of sensitivity cycling.…”
Section: Discussionmentioning
confidence: 96%
“…The combined effect of heat shock and the typical high temperatures of the summer season is even more unknown than their isolated effects 17,21,29 . In Mediterranean habitats, seed dispersal occurs frequently during the summer, when seeds have to withstand the high soil temperatures before their germination in autumn or winter and eventual wildfire, which typically occurs during the summer in these areas.…”
mentioning
confidence: 99%
“…A particular gap in restoration research, little is known about the role of fire in the reproduction and establishment of savanna grassland plants. Initial studies on heat shock simulated in the laboratory suggest that fire does not break seed dormancy, stimulate germination, or kill the seeds (Le Stradic et al ., ; Fichino et al ., ; Zupo, Baeza & Fidelis, ), whereas in field experiments, although many seeds died, fire indirectly promoted germination of surviving seeds, by reducing vegetation cover, which increased soil surface temperature fluctuation (Daibes et al ., ). In a laboratory study of grasses of southern Africa, Ghebrehiwot et al .…”
Section: Restorationmentioning
confidence: 99%
“…Each replicate consisted of 20 seeds depending on seed availability (Supplementary Data Table S4). To avoid misinterpretation with soil temperature fluctuations, which reach up to 60 °C (Zupo et al, 2016;Daibes et al, 2017), lower temperatures were not tested. Therefore, we applied 100 °C as a typical fire-related heat dose (e.g.…”
Section: Heat Shocks and Germination Proceduresmentioning
confidence: 99%