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INRA
24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

Menu Logo Principal Clermont Auvergne University

UMR GDEC

Joint Research Unit 1095 Genetics, Diversity and Ecophysiology of Cereals

Axis 2 - Exploitation: How can we better integrate genetic diversity into varietal selection programs?

We are developing decision support tools to optimize multi-character genetic gain over the long term through genomic predictions of the value of lines and crosses. We are particularly interested in haplotypic approaches to improve the capabilities of these cross value predictions. For this we use the polymorphisms detected in the first research axis of the team (SNPs, structural variations, introgressions, heritable epigenetic markers...).

Recombination is essential to obtain new favorable allele associations. We are collaborating with the GeCO team and the UMR Genphyse on improving recombination rate estimation by combining genetic maps and maps of estimated historical recombination with diversity panels. The objective is to test on simulated and real data the efficiency of cross value prediction equations that integrate recombination rate and to optimize crossing plans to ensure long-term genetic gain over several traits.

Interactions with other teams in the unit specialized in traits of agronomic interest (grain quality, QualiGrain; plant ecophysiology and grain filling, VISTA; resistance to fusarium and septoria, MDC) and also outside the unit (resistance to rust, BIOGER...) will allow us to think about new ideotypes and the corresponding crossing plans. The objective is to produce populations enriched in favorable alleles with fast cycles thanks to the speed breeding workshop developed by the CPCC team. These lines will be evaluated by breeders in the IVD trial network. The applied objective would be to develop a pre-breeding network to reintroduce useful diversity into breeding programs.

The longer-term objective would be to extend these approaches (diagnostic markers, genomic predictions) to exotic elite x and wild elite x crosses. Populations of synthetic wheat and triticale (collaboration with GeCO and PaleoEvo teams, Agroscope, GIE RDC, GIE Triticale...) are already produced under dynamic management and/or under various constraints. Their genotyping could allow the detection of favorable alleles, haplotypic approaches to find the genitors of interest. New populations may be produced that target new research questions.

Beyond the interest of the lines thus produced for varietal improvement, this work will provide fundamental research material that will allow the study of the impact of polyploidization, the determinism of interspecific recombination or the stability of crossings. They can then be extended with the introduction of other related species in the crosses.

DiGen Polyploidisaiton
DiGen BléMains