Effects of aqueous smoke solutions and heat on seed germination of herbaceous species of the Sudanian savanna-woodland in Burkina Faso

Dayamba, Sidzabda Djibril; Sawadogo, Louis; Tigabu, Mulualem; Savadogo, Patrice; Zida, Didier; Tiveau, Daniel; Odén, Per Christer

doi:10.1016/j.flora.2009.12.017

Cited by 33 publications

(24 citation statements)

References 47 publications

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“…As already observed in herbaceous species of savannas (Dayamba et al . , ; Fichino et al . ) no fire‐related cue had a marked effect on seed germination.…”

Section: Discussionmentioning

confidence: 99%

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Diversity of germination strategies and seed dormancy in herbaceous species of campo rupestre grasslands

et al. 2015

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The effects of fire on the vegetation vary across continents. However, in Neotropical fire-prone grasslands, the relationship between fire and seed germination is still poorly understood, while their regeneration, especially after strong anthropogenic disturbance, is challenging for their conservation. In the present study, we assessed diversity of germination strategies in 15 dominant herbaceous species from Neotropical altitudinal grasslands (locally known as campos rupestres). We exposed seeds to several fire-related treatments. We also compared germination between regularly and post-fire fruiting species. Finally, we investigated the diversity of dormancy classes aiming at better understanding the biogeography and phylogeny of seed dormancy. Germination strategies varied among families. Velloziaceae and Xyridaceae produced non-dormant, fast-germinating seeds. Cyperaceae and Poaceae showed an extremely low or null germination due to a high proportion of unviable or embryo-less seeds.The seeds of campo rupestre grasslands are fire resistant, but there is no evidence that fire triggers germination in this fire-prone ecosystem. Although heat and charred wood did not promote germination, smoke enhanced germination in one grass species and decreased the mean germination time and improved synchrony in Xyridaceae and Velloziaceae. Fire had a positive effect on post-fire regeneration by stimulating fruit set in some Cyperaceae and Poaceae species. These species produced faster germinating seeds with higher germination percentage and synchrony compared to regularly fruiting Cyperaceae and Poaceae species. This strategy of dispersion and regeneration seems to be an alternative to the production of seeds with germination triggered by fire. Physiological dormancy is reported for the first time in several clades of Neotropical plants. Our data help advance the knowledge on the role of fire in the regeneration of Neotropical grasslands.

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“…As already observed in herbaceous species of savannas (Dayamba et al . , ; Fichino et al . ) no fire‐related cue had a marked effect on seed germination.…”

Section: Discussionmentioning

confidence: 99%

“…, ), African savannas (Dayamba et al . , ) and African fynbos (Keeley & Bond ). However, the effects of fire on the germination of herbaceous species in Neotropical grasslands and the effects of fire‐related cues remain poorly understood (Ribeiro et al .…”

Section: Introductionmentioning

confidence: 99%

Diversity of germination strategies and seed dormancy in herbaceous species of campo rupestre grasslands

et al. 2015

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“…A large number of studies have concluded that temperature increase and smoke from burning, or the interaction between them, can break seed dormancy (Brown ; Keeley & Fotheringham ; Dayamba et al . ) and can stimulate germination of herbaceous and woody species (Keeley ; Mucunguzi & Oryem‐Origa ; Keeley & Fotheringham ; Chou et al . ).…”

Section: Introductionmentioning

confidence: 99%

Effects of heat on the germination of sclerophyllous forest species in the highlands of Madagascar

et al. 2015

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International audienceThe effects of fire on germination have been extensively studied in many ecosystems. Several studies have shown that plant species in ecosystems frequently exposed to fire can survive through two main mechanisms: vegetative regeneration (re-sprouts) and recruitment of new individuals from a fire-resistant seed bank. In Africa, an increase in temperature can break seed dormancy and stimulate germination of some herbaceous and woody species. In Madagascar, the once widespread highland ecosystems dominated by woody species are now highly fragmented and dominated by anthropic grasslands and fields, with a significantly reduced area occupied by sclerophyllous forests referred to as ‘tapia woodlands’. Six species of this endemic vegetation type were studied: Abrahamia ibityensis (Anacardiaceae), Aphloia theiformis (Aphloiaceae), Carissa edulis (Apocynaceae), Pentachlaena latifolia (Sarcolaenaceae), Uapaca bojeri (Phyllanthaceae) and Vaccinium secundiflorum (Ericaceae). Germination tests were conducted (i) by soaking seeds in water for 24 h (imbibition) or (ii) by exposing the seeds to dry heat. Four different temperatures (40, 60, 80 and 120°C) were applied, and seeds were exposed for 10, 30, 60 and 90 min. To simulate hotter faster-burning fires, two higher temperatures (100 and 120°C) were also used by exposing seeds to dry heat for 5 min. The results did not reveal any significant effect of 24-h water imbibition on germination. For most species, germination decreased with increasing temperature of treatment using dry heat. Uapaca bojeri did not germinate under any treatment. Further studies on the biological and ecological characteristics of tapia woodland species in response to fire are needed to help guide conservation, management and restoration activities focusing on this endemic vegetation type

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“…Evidence of smoke-stimulated germination is scarce among plant species in grasslands of temperate (Tsuyuzaki and Miyoshi, 2009;Ghebrehiwot et al, 2012;Gonzalez and Ghermandi, 2012;Schwilk and Zavala, 2012) and tropical zones (Razanamandranto et al, 2005;Dayamba et al, 2010;Le Stradic et al, 2015). In our study, only S. byzantina positively responded to the smoke treatment, and this is the first record of smoke-stimulated germination in Central Anatolian steppe.…”

Section: Taxonmentioning

confidence: 40%

Fire-related germination and early seedling growth in 21 herbaceous species in Central Anatolian steppe

Tavşanoğlu

Çatav

Özüdoğru

2015

Journal of Arid Environments

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Effects of aqueous smoke solutions and heat on seed germination of herbaceous species of the Sudanian savanna-woodland in Burkina Faso

Cited by 33 publications

References 47 publications

Diversity of germination strategies and seed dormancy in herbaceous species of campo rupestre grasslands

Diversity of germination strategies and seed dormancy in herbaceous species of campo rupestre grasslands

Effects of heat on the germination of sclerophyllous forest species in the highlands of Madagascar

Fire-related germination and early seedling growth in 21 herbaceous species in Central Anatolian steppe

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