Katharina Birgit Budde
AgreenSkills session, year: 2nd session, 2016
Receiving laboratory: BIOGECO Biodiversity, Genes and Communities, Bordeaux Aquitaine
Country of origin : Denmark
Hybridization and adaptive allele sharing in tropical keystone tree species complexes in relation to drought stress (HYBADAPT)
In highly diverse tropical forests closely related species often occur in sympatry and sometimes interbreed. Hybridization is a common mechanism with wide-ranging impacts on the evolution of plant biodiversity and adaptation. In our project, we study to what extent multiple tropical tree species hybridize and share adaptive alleles, resulting in “collective evolution” of the species complexes. Our central hypothesis is that hybridization between species may allow the spread of adaptive alleles beyond species borders (especially in rare species), facilitating a rapid evolutionary response to environmental change. The combination of rising temperatures and declining precipitation due to anthropogenic global change has led to increasing drought risk also in many tropical forests around the globe. Our project therefore focusses on the role of adaptive allele sharing in two tropical tree species complexes and its evolutionary importance for response to drought stress. We use novel sequencing technology and bioinformatic tools to characterize the genomics of two independent tree species assemblages of occasionally hybridizing non-model tree species: (a) Symphonia (Clusiaceae), widespread and endemic to Madagascar and (b) Lecythis/Eschweilera (Lecythidaceae), an ecologically diverse species complex widespread in the Neotropics.
Q1. How are tree species (taxa) delimited in the Symphonia and Lecythis/Eschweilera complexes and what are the phylogenetic relationships between taxa?
Q2. What is the extent of hybridization in the Symphonia and Lecythis/Eschweilera complexes?
Q3. What is the extent of adaptive allele sharing in sympatric species of the Symphonia and Lecythis/Eschweilera complexes? Which genes are involved in drought adaptation and do drought stress response genes introgress faster than neutral control genes?
I am interested in ecological population genetics and genomics of tree species and the effect of abiotic and biotic interactions. During my PhD at the Center of Forest Research in Madrid, I studied the influence of fire events and past climatic oscillations on the demographic history, spatial genetic structure and local adaptation of natural tree populations. Afterwards, I was a postdoc at the University of Copenhagen and investigated resistance of Nordmann fir trees to adelgid feeding using transcriptome data.
Since September 1st 2016 I investigate adaptive allele sharing in tropical tree species complexes at INRA-Université de Bordeaux, mixed research unit BioGeCo. Tropical ecosystems and their astonishing species richness have always attracted my attention. I studied a year at the University of Costa Rica and I conducted field work in Cameroon and Madagascar and I am very happy to resume my research on tropical tree species now.
*Budde KB, González-Martínez SC, Navascués M, Burgarella C, Mosca E, Lorenzo Z, Zabal-Aguirre M, Vendramin GG, Verdú M, Pausas JG, Heuertz M (2017) Increased fire frequency promotes stronger spatial genetic structure and natural selection at regional and local scales in Pinus halepensis Mill. Annals of Botany, doi:10.1093/aob/mcw286.
Budde KB, Nielsen RN, Ravn HP, Kjaer ED (2016) The natural evolutionary potential of tree populations to cope with newly introduced pests and pathogens – lessons learned from forest health catastrophes in recent decades. Current Forestry Reports, 2, 18-29.
Ojeda F, Budde KB, Heuertz M, Segarra-Moragues JG, González-Martínez SC. (2016) Biogeography and evolution of seeder and resprouter forms of Erica coccinea (Ericaceae) in the fire-prone Cape fynbos. Plant Ecology, 217, 751.
*Scotti I, González-Martínez SC, Budde KB, Lalagüe H (2015). Fifty years of genetic strudies. What to make of the large amount of variation found within populations? Annals of Forest Sciences, 73, 69-75.
*Budde KB, Heuertz M, Hernández-Serrano A, Pausas J, Vendramin GG, Verdú M, González-Martínez SC. (2014) In situ genetic association for serotiny, a fire-related trait, in Mediterranean maritime pine (Pinus pinaster Aiton). New Phytologist, 201, 230-241.
*Hardy O, Born C, Budde KB, Dainou K, Dauby G, Duminil J et al. (2013). Comparative phylogeography of African rain forest trees: A review of genetic signatures of vegetation history in the Guineo-Congolian region. Comptes Rendus Geoscience, 345, 284–296.
*Budde KB, González-Martínez SC, Hardy OJ, Heuertz M (2013). The ancient tropical rainforest tree Symphonia globulifera L. f. (Clusiaceae) was not restricted to postulated Pleistocene refugia in Atlantic Equatorial Africa, Heredity, 111, 66-76.
Pinzauti F, Sebastiani F, Budde KB, Fady B, González-Martínez SC, Vendramin GG (2012) Nuclear microsatellites for Pinus pinea (Pinaceae), a genetically depauperate tree, and their transferability to P. halepensis. American Journal of Botany, 9, E362-E365
Budde KB, Gallo L, Marchelli P, Mosner E, Liepelt S, Ziegenhagen B, Leyer I (2010). Wide spread invasion without sexual reproduction? A case study on European willows in Patagonia, Argentina. Journal of Biological Invasions, 13, 45-54.