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Poster communications

Etude de la composition génétique et de la microstructuration spatiale de semis de Populus nigra, installés sur une nouvelle barre sédimentaire de Loire (France)

Abstract : Black poplar (Populus nigra L.) is a key species of the Loire riverine ecosystem and represents one biological marker of the sediment morphodynamics and fluvial metamorphosis of the river. This species is threatened by human impacts. The main objective of this work is to study small-scale spatial genetic structure of P. nigra seedlings on a new sandy-gravelly bar appeared after fluvial maintenance operations in a mosaic of five islands (13 hectares, included in the Conservation Unit of genetic resources of P. nigra, Loire River, Loiret, France). In September 2012, the vegetation of the central island was uprooted and the level lowered in order to maintain the flow capacity of the river. During 2013 spring and summer, the fresh sediments of the new bar were regularly surveyed to identify and geocode successive regeneration zones. In September 2013, 1550 seedlings (31 seedlings x 50 zones) were collected for genetic analysis using 11 microsatellites DNA markers. Genetic diversity was expressed in terms of percentage of polymorphic loci, observed and effective number of alleles, observed and expected heterozygosity and genetic differentiation (Fst). Although significantly different from zero, Fst within the 50 regeneration zones is very low and level of genetic diversity is comparable to parental populations (mature trees on the river banks). These results are discussed in terms of microtopography, water level fluctuation, phenology of seed dehiscence and sediment texture.
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https://hal.inrae.fr/hal-02742719
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  • HAL Id : hal-02742719, version 1
  • PRODINRA : 353174

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Sara Marin, Véronique Jorge, Vanina Guérin, Coraline Wintenberger, Marc Villar. Etude de la composition génétique et de la microstructuration spatiale de semis de Populus nigra, installés sur une nouvelle barre sédimentaire de Loire (France). I.S. Rivers, 2e conférence internationale "recherches et actions au service des fleuves et grandes rivières", Jun 2015, Lyon, France. Groupe de Recherche Rhône-Alpes sur les Infrastructures et l’Eau (GRAIE), 168 p., 2015, 2e Conference International I.S. Rivers Integrative Sciences Recherches et Actions "Recherches et actions au service des fleuves et grandes rivières. Integrative sciences and sustainable development of rivers". Programme et résumés. Programme and abstracts. ⟨hal-02742719⟩

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