Title :

Genetic basis and timing of a major mating system shift in Capsella

Author(s) :

Bachmann, Jörg A [Auteur]
Department of Ecology, Environment and Plant Sciences [Stockholm]
Tedder, Andrew [Auteur]
Department of Ecology, Environment and Plant Sciences [Stockholm]
Laenen, Benjamin [Auteur]
Department of Ecology, Environment and Plant Sciences [Stockholm]
Fracassetti, Marco [Auteur]
Department of Ecology, Environment and Plant Sciences [Stockholm]
Désamoré, Aurélie [Auteur]
Department of Ecology, Environment and Plant Sciences [Stockholm]
Lafon‐placette, Clément [Auteur]
Steige, Kim [Auteur]
Department of Ecology, Environment and Plant Sciences [Stockholm]
Callot, Caroline [Auteur]
Centre National de Ressources Génomiques Végétales [CNRGV]
Marande, William [Auteur]
Centre National de Ressources Génomiques Végétales [CNRGV]
Neuffer, Barbara [Auteur]
University of Osnabrueck
Bergès, Hélène [Auteur]
Centre National de Ressources Génomiques Végétales [CNRGV]
Köhler, Claudia [Auteur]
Castric, Vincent [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Slotte, Tanja [Auteur]
Department of Ecology, Environment and Plant Sciences [Stockholm]

Journal title :

New Phytologist

Pages :

505-517

Publisher :

Wiley

Publication date :

2019-08

ISSN :

0028-646X

English keyword(s) :

dominance modifier
long-read sequencing
Capsella
parallel evolution
plant mating system shift
S-locus
small RNA
self-compatibility

HAL domain(s) :

Sciences du Vivant [q-bio]/Génétique/Génétique des populations [q-bio.PE]

English abstract : [en]

A crucial step in the transition from outcrossing to self-fertilization is the loss of genetic self-incompatibility (SI). In the Brassicaceae, SI involves the interaction of female and male speci-ficity components, encoded ...
Show more >A crucial step in the transition from outcrossing to self-fertilization is the loss of genetic self-incompatibility (SI). In the Brassicaceae, SI involves the interaction of female and male speci-ficity components, encoded by the genes SRK and SCR at the self-incompatibility locus (S-lo-cus). Theory predicts that S-linked mutations, and especially dominant mutations in SCR, are likely to contribute to loss of SI. However, few studies have investigated the contribution of dominant mutations to loss of SI in wild plant species. Here, we investigate the genetic basis of loss of SI in the self-fertilizing crucifer species Capsella orientalis, by combining genetic mapping, long-read sequencing of complete S-hap-lotypes, gene expression analyses and controlled crosses. We show that loss of SI in C. orientalis occurred < 2.6 Mya and maps as a dominant trait to the S-locus. We identify a fixed frameshift deletion in the male specificity gene SCR and confirm loss of male SI specificity. We further identify an S-linked small RNA that is predicted to cause dominance of self-compatibility. Our results agree with predictions on the contribution of dominant S-linked mutations to loss of SI, and thus provide new insights into the molecular basis of mating system transitions.Show less >

Language :

Anglais

Popular science :

Non

European Project :

Emergence of novel phenotypes in co-evolving biological systems: allelic diversification and dominance at the Self-incompatibility locus in Arabidopsis.

Collections :

• Évolution, Écologie et Paléontologie (Evo Eco Paleo) - UMR 8198

Source :

Harvested from HAL