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Providing knowledge about seed germination ecology to boost establishment success in revegetation projects: case study of Heteropogon contortus

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Université de la Réunion

Campus du Moufia

POSTERS

(2)

Island Biology

Book of Abstracts

Posters

Third International Conference

on Island Ecology, Evolution and Conservation

8-13 July 2019 University of La R´eunion

Saint Denis, France

(3)

124

Providing knowledge about seed germination ecology to boost

establishment success in revegetation projects: case study of

Heteropogon contortus

C´edric Leperlier ∗† 1,2, Jean-No¨el Eric Riviere 1, Agathe Allibert 1, Dominique Dessauw 1,

St´ephane Lacroix 2, Isabelle Fock-Bastide 1

1 Peuplements v´eg´etaux et bioagresseurs en milieu tropical (UMR PVBMT) – Facult´e des Sciences et

techniques - Universit´e de La R´eunion 15 avenue Ren´e Cassin CS92003 97744 Saint-Denis C´edex 9 pour le Cirad Station de Ligne-Paradis - 7 chemin de l´IRAT - 97410 Saint-Pierre, R´eunion

2SCEA P´epini`ere du Th´eˆatre – CS 51013 Chemin de la Vanille 97434 Saint-Gilles les Bains, R´eunion

Dry lands including savannas cover an important proportion of terrestrial areas and are home for more than a third of global population. However, changes in land use and climate are causing severe species loss in these habitats. In a geographically limited area such as Reunion Island, revegetation projects including native species could allow to counter human-driven habitat degradation. Neverthe-less, lack of knowledge, especially regarding native seed germination ecology often hinders their use for revegetation purposes. The aim of our study was to provide information about seed germination ecology of Heteropogon contortus (Poaceae), the dominant and noticeable savannas species of Reunion Island. Through germination experiments carried out in controlled lab conditions, dormancy and light requirements of H. contortus seeds were assessed over a 3-year storage period. In addition, the effects of smoke water solutions on H. contortus seeds germination capacity were determined. During the first year, seeds germinate in low proportions, consistent with a dormancy phenomenon. Moreover, between one and two years, germination percentages are higher in light than in darkness, suggesting they are photoblastic (i.e. require light for germination). Interestingly, seeds treated with smoke water solutions germinated in higher proportions than control seeds in both daily light and darkness during the two first years of storage. The germination strategies (dormancy and photoblasty) set up by H. contortus are likely driven by harsh conditions found in arid habitats such as savannas. While dormancy could help avoiding germination in the drier season, photoblasty would be linked to an adaptation to fire, indicating that its environment is suitable for its establishment. The methods we used to treat seeds could be adopted for large-scale H. contortus habitats revegetation projects, due to their low cost, their efficiency and their reproducibility.

Keywords: Heteropogon contortus, germination, physiological dormancy, photoblasty, smoke, infused wa-ter, revegetation

∗ Speaker †

Corresponding author: cedric.leperlier@cirad.fr

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