ORAL PRESENTATION: Range-wide signatures of drought adaptation in two widespread European Fagaceae using environmental, genomic, and phenotypic data

Submitted by : Fady Bruno
Abstract type : Oral presentation
Session type : Conference session 1: GENOMES and the ENVIRONMENT
Author Speaker : Benjamin Dauphin

Information about other authors :

Benjamin Dauphin1, Isabelle Lesur2,3, Elisabet Martínez-Sancho1, Lars Opgenoorth1,3, Katrin Heer4, Ivan Scotti4, Christophe Plomion2, Felix Gugerli1, Santiago C. González-Martínez2, Christian Rellstab1


1Swiss Federal Research Institute WSL, Birmensdorf, Switzerland

2UMR BIOGECO, INRA, University of Bordeaux, F-33610 Cestas, France

3Philipps-Universität Marburg, Department of Ecology, Marburg, Germany 

4Philipps-Universität Marburg, Conservation Biology, Marburg, Germany

5INRA, URFM, Avignon, France

Abstract :

As a consequence of ongoing climate change, forests are increasingly subjected to temperature- and drought-induced stresses. The trend towards extremes in environmental conditions has led to increased mortality, for example in Europe, after the unprecedented heat waves and drought periods having occurred in recent years. Better understanding the impact of those extreme and rapid environmental shifts on tree populations is important i) to assess the adaptive potential of each population in regard to its future habitat, and ii) to characterise sources of adaptive genomic variation that ultimately might be used for assisted migration. Yet, little is known about the genetic mechanism underlying climate adaptation of tree species at the continental scale and about their capability to adapt to rapidly changing conditions given their long generation time. In this context, we investigated the genetic underpinnings of adaptation to drought resistancein the two ecologically and economically important European Fagaceae trees, Fagus sylvaticaand Quercus petraea, through a combined analysis of environmental, phenotypic, and genomic data. In the course of the H2020 project GenTree, we sampled twelve and nine population pairs in contrasting environments across Europe for F. sylvaticaand Q. petraea, respectively. Using climatic, topographic, and soil variables, we generated various drought indices to model ecological constraints at high spatial resolution (i.e. individual tree level), covering past and present local habitats of 600 and 490 individuals for F. sylvaticaand Q. petraea, respectively. Also, we utilised in situphenotype measurements and wood cores of individual trees to produce drought-related phenotypic traits derived from tree-ring series. An in-depth exome-capture sequencing provided about 17 (F. sylvatica) and 8 (Q. petraea) million SNPs. We carried out genotype–environment association analyses that allowed us to identify loci potentially under selection by drought-related environmental factors. Then, we will investigate phenotype–genotype associations to search for genes underlying important drought-related traits. Finally, we will discuss similarities and differences in adaptive signatures in the two related species and draw recommendations for forest management under future climate scenarios.

Bibliografic references :

Keywords : adaptation, Beech, climate, drought, dendro-phenotype, exome capture, Oak
: Dauphin_etal_GenTreeFinalConf.docx 17.39 kB