Post-doctoral research position in Kelp life history, evolution and selection for aquacultureExternal

Evolutionary Biology and Ecology of Algae

News Overview

Contact: Myriam Valero
E-mail: valero [at] sb-roscoff.fr
Deadline: May 10, 2017

A two-year postdoctoral research position is available immediately at the Roscoff Marine Laboratory (RML), UMI "Evolutionary Biology and Ecology of Algae" in France. The aim of the project is to use a combination of crossing experiments and genetic analyses in order to improve basic knowledge of life history traits evolution in brown algae and to implement kelp selection for aquaculture. This position is funded in the context of the EU GENIALG project (H2020-EU-BG-01-2016, ID 727892).

Artificial selection is crucial to algal aquaculture development, and contrarily to many terrestrial plant species, selection process in seaweed is in infancy, particularly in Europe. The aim of the GENIALG project is to implement basic research for selection process in seaweed aquaculture incorporating rigorous evolutionary thinking into it.  Generally, seaweed populations are characterized by large level of genetic differentiation suggesting that populations are adapted to their local environment. In this context, parents that are too similar genetically may suffer from reduced crossing compatibility due to inbreeding depression, whereas crosses between parents that are too different genetically may lead to an outbreeding depression by disrupting adaptive complexes. An intermediate optimal outcrossing distance is therefore expected as a compromise between inbreeding depression and outbreeding depression. In addition, seaweeds display complex life cycles, involving an alternation of haploid and diploid individuals. The consequences of such cycles for the reproductive system have been little studied experimentally. In particular, inbreeding depression is expected to be reduced as deleterious mutations are removed from the genome during the haploid phase.

 

The objective of this project is to address these questions combining crossing experiments with genetic analyses, in particular quantitative trait locus (QTL) and genome-wide association studies (GWAS) in the kelp Saccharina latissima. The effects of crosses on reproductive success will be investigated by examining the evolution of crossing compatibility with increasing geographic distance. The number of fertilizations and abortion rate will be measured in single-male crosses in laboratory conditions, as estimates of prezygotic and early postzygotic compatibility between mates. Segregating families will be generated by carrying out intraspecific crosses between selected strains of S. latissima and the progeny will be phenotyped under controlled conditions to identify novel strains with characteristics of industrial interest. Several parameters will be taken into account, including growth characteristics, biomolecule content (e.g. lipids, polysaccharides, proteins, amino acids) and stress and disease resistance. In addition to the phenotype-based breeding approaches proposed above, we will develop marker-based breeding strategies based on QTL identification and genome wide association studies (GWAS). These approaches will be developed specifically for S. latissima using data generated in the GENIALG project but will also take advantage of currently available genomic sequence data for this species and the sister species S. japonica (Yeet al., 2015, Nature communications6), and of additional genomic data that will be generated by the recently funded French "Phaeoexplorer" project.

Applicants must have a PhD in evolutionary ecology, in plant breeding or genetics. They must have a good background in population genetics and demonstrable experience in breeding experiments. Specific experience on seaweed ecology and culturing is preferable.

 

Salary will be 2000 € to 2500€ per month (net) depending on experience.

Applications are accepted until 10 May, 2017 and should include CV together with a description of research experience, relevant publications and 2 letters of references. Selected candidates will be interviewed from the 11 – 12 May 2017. 

 

Applications should be sent to Myriam Valero (valeroatsb-roscoff [dot] fr) and Barbara Raffenne (barbara [dot] raffenneatsb-roscoff [dot] fr). We prefer applications in electronic form.