Soil seed bank characteristics in two central African forest types and implications for forest restoration

Douh, Chauvelin; Daïnou, Kasso; Loumeto, Jean Joël; Moutsambote, Jean-Marie; Tosso, Félicien; Forni, Éric; Gourlet‐Fleury, Sylvie; Doucet, Jean‐Louis

doi:10.1016/j.foreco.2017.12.012

Cited by 47 publications

(72 citation statements)

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“…https://doi.org/10. (Finance code 001) to J.P. Ribeiro-Oliveira and Conselho Nacional de Desenvolvimento Científico e Tecnológico 309718/ 2018-0 to E. A. Amaral da Silva.themselves in an area [3][4][5][6]. Thus, when we understand how the soil seed bank works, we do not only outline strategies for in situ conservationism of species, but also ex situ (germplasm banks).…”

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What happens when the rain is back? A hypothetical model on how germination and post-germination occur in a species from transient seed banks

et al. 2020

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We hypothesize that by simulating the natural priming in seeds of a species that forms transient seed banks it is possible to clarify molecular aspects of germination that lead to the recruitment of seedlings when the next rainy season begins. We used seeds of Solanum lycocarpum as a biological model. Our findings support the idea that the increment of seed germination kinetics when the rainy season returns is mainly based on the metabolism and embryonic growth, and that the hydropriming, at the end of seed dispersion, increases the germination window time of these seeds by mainly increasing the degradation of galactomannan of the cell wall. This can improve the energy supply (based on carbon metabolism) for seedling growth in post-germination, which improves the seedling's survival chances. From these findings, we promote a hypothetical model about how the priming at the end of the rainy season acts on mRNA synthesis in the germination of seeds from transient banks and the consequence of this priming at the beginning of the following rainy season. This model predicts that besides the Gibberellin and Abscisic Acid balance (content and sensitivity), Auxin would be a key component for the seed-seedling transition in Neotropical areas.Seed collection was performed under authorization number SISGEN AB0EB45. OPEN ACCESS Citation: Souza BLd, Ribeiro-Oliveira JP, Bravo JP, Dias GF, Silva EAAd (2020) What happens when the rain is back? A hypothetical model on how germination and post-germination occur in a species from transient seed banks. PLoS ONE 15 (2): e0229215. https://doi.org/10.(Finance code 001) to J.P. Ribeiro-Oliveira and Conselho Nacional de Desenvolvimento Científico e Tecnológico 309718/ 2018-0 to E. A. Amaral da Silva.themselves in an area [3][4][5][6]. Thus, when we understand how the soil seed bank works, we do not only outline strategies for in situ conservationism of species, but also ex situ (germplasm banks). In this context, several reports have brought light to the functionality of these banks, relying mainly on longevity and the germination-dormancy balance of seeds [e.g., 7 and their references]. However, we still know little about what affects this germination-dormancy balance from a molecular point of view. A strategy to fill this gap is to cross classic physiological measurements of the germination ecophysiology with key components of the gene expression involved in embryo growth [8].A limiting factor to perform a crosstalk between gene expression and germination ecophysiology would be that laboratory protocols are not very representative of what happens in the field from an ecological point of view. However, this barrier is being overcome by the idea that detailed laboratory protocols for sampling communities and performing germination experiments can produce significant characters that are as enlightening as those obtained in field experiments. Therefore, if we have these protocols, we will be able advance the understanding of functional plant traits [see 9]. For example, the interruption of...

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What happens when the rain is back? A hypothetical model on how germination and post-germination occur in a species from transient seed banks

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“…Nos deux types forestiers répondent à la même logique. Douh et al (2018) ont mis en évidence des banques de graines, toutes espèces confondues, plus abondantes dans la forêt à Celtis que dans la forêt à Manilkara.…”

Section: Variation De La Banque De Graines Du Sol D'e Suaveolens En unclassified

“…La forêt à Manilkara serait plus âgée que la forêt à Celtis Douh et al, 2018). En effet, Morin-Rivat et al (2016) ont observé dans les sols de la forêt à Manilkara une moindre abondance de charbon de bois et de tessons de poterie, lesquels sont des indicateurs d'activités anthropiques anciennes.…”

Section: Variation De La Banque De Graines Du Sol D'e Suaveolens En unclassified

“…Cette dernière hypothèse semble toutefois peu vraisemblable dans notre cas car d'autres graines dormantes et a priori moins résistantes que celles d'E. suaveolens (par exemple, Nauclea diderrichii) ont été observées dans la banque du sol de la forêt à Manilkara (Douh et al, 2018).…”

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“…Les rares études effectuées en la matière démontrent pourtant une forte densité de graines viables dans le sol, au moins jusqu'à 20 cm de profondeur, les horizons plus profonds n'ayant pas encore été étudiés (Douh et al, 2018).…”

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Banque de graines du sol et déterminants de la germination du tali, Erythrophleum suaveolens (Guill. & Perr.) Brenan

Douh¹,

Gorel²,

Daïnou³

et al. 2019

Bois for. trop.

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Cette étude évalue l’abondance des graines d’Erythrophleum suaveolens dans la banque de semences du sol des forêts denses humides d’Afrique centrale. Les travaux ont été menés au Nord-Congo dans deux types forestiers : la forêt à Celtis sur des sols argilo-sableux à sablo-argileux et la forêt à Manilkara sur des sols sableux. Les tiges d’E. suaveolens (dhp ≥ 10 cm) ont été inventoriées dans deux blocs de 400 ha, et les structures diamétriques de leurs populations ont été comparées. En outre, 80 fosses (2 x 40 fosses par type de forêt) ont été creusées au pied de 20 arbres (10 par forêt), sur trois couches contiguës de 10 cm chacune, soit à une profondeur totale de 30 cm, et l’abondance des graines dans la banque de semences du sol a été évaluée. La dormance des graines récoltées a été testée par des essais de germination après traitement au H2SO4 et cinq graines prélevées jusqu'à une profondeur de 20 cm dans la forêt à Celtis ont été utilisées pour estimer leur âge par spectroscopie de masse par accélérateur (AMS). Dans les deux types forestiers, les structures diamétriques présentent une distribution gaussienne, illustrant un déficit de régénération. Alors que les densités de tiges (dhp ≥ 10 cm) sont proches, avec 0,85 et 1,05 tige/ha respectivement, dans la forêt à Celtis et la forêt à Manilkara. Les densités de graines sont significativement plus élevées dans la forêt à Celtis (8,55 graines/m2) que dans la forêt à Manilkara (0,15 graine/m2). Le pourcentage maximum de germination obtenu était de 19,1 % pour des graines n’ayant subi aucun traitement. Les lots traités à l’acide ont présenté de moindres taux de germination. Ces graines semblent pouvoir se conserver une dizaine d’années au moins dans la banque du sol. Les facteurs pouvant influencer les variations de densité des graines sont discutés et des recommandations sylvicoles sont formulées.

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The puzzling ecology of African Marantaceae forests

Pouteau,

Picard,

Doumenge

et al. 2024

American J of Botany

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Marantaceae forests are tropical rainforests characterized by a continuous understory layer of perennial giant herbs and a near absence of tree regeneration. Although widespread in West‐Central Africa, Marantaceae forests have rarely been considered in the international literature. Yet, they pose key challenges and opportunities for theoretical ecology that transcend the borders of the continent. Specifically, we ask in this review whether open Marantaceae forests and dense closed‐canopy forests can be considered as one of the few documented examples of alternative stable states in tropical forests. First, we introduce the different ecological factors that have been posited to drive Marantaceae forests (climate, soil, historical and recent anthropogenic pressures, herbivores) and develop the different hypotheses that have been suggested to explain how Marantaceae forests establish in relation with other vegetation types (understory invasion, early succession after disturbance, and intermediate successional stage). Then, we review the underlying ecological mechanisms that can explain the stability of Marantaceae forests in the long term (tree recruitment inhibition, promotion of and resilience to fire, adaptive reproduction, maintenance by megaherbivores). Although some uncertainties remain and call for further empirical and theoretical research, we found converging evidence that Marantaceae forests are associated with an ecological succession that has been deflected or arrested. If verified, Marantaceae forests may provide a useful model to understand critical transitions in forest ecosystems, which is of particular relevance to achieve sustainable forest management and mitigate global climate change.

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Soil seed bank characteristics in two central African forest types and implications for forest restoration

Cited by 47 publications

References 55 publications

What happens when the rain is back? A hypothetical model on how germination and post-germination occur in a species from transient seed banks

What happens when the rain is back? A hypothetical model on how germination and post-germination occur in a species from transient seed banks

Banque de graines du sol et déterminants de la germination du tali, Erythrophleum suaveolens (Guill. & Perr.) Brenan

The puzzling ecology of African Marantaceae forests

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