Separating phases of allopolyploid evolution with resynthesized and natural Capsella bursa-pastoris

Author:

Duan Tianlin1ORCID,Sicard Adrien2,Glémin Sylvain13ORCID,Lascoux Martin1ORCID

Affiliation:

1. Department of Ecology and Genetics, Evolutionary Biology Centre and Science for Life Laboratory, Uppsala University

2. Department of Plant Biology, Swedish University of Agricultural Sciences

3. UMR CNRS 6553 ECOBIO, Campus Beaulieu

Abstract

Allopolyploidization is a frequent evolutionary transition in plants that combines whole-genome duplication (WGD) and interspecific hybridization. The genome of an allopolyploid species results from initial interactions between parental genomes and long-term evolution. Distinguishing the contributions of these two phases is essential to understanding the evolutionary trajectory of allopolyploid species. Here, we compared phenotypic and transcriptomic changes in natural and resynthesized Capsella allotetraploids with their diploid parental species. We focused on phenotypic traits associated with the selfing syndrome and on transcription-level phenomena such as expression-level dominance (ELD), transgressive expression (TRE), and homoeolog expression bias (HEB). We found that selfing syndrome, high pollen, and seed quality in natural allotetraploids likely resulted from long-term evolution. Similarly, TRE and most down-regulated ELD were only found in natural allopolyploids. Natural allotetraploids also had more ELD toward the self-fertilizing parental species than resynthesized allotetraploids, mirroring the establishment of the selfing syndrome. However, short-term changes mattered, and 40% of the cases of ELD in natural allotetraploids were already observed in resynthesized allotetraploids. Resynthesized allotetraploids showed striking variation of HEB among chromosomes and individuals. Homoeologous synapsis was its primary source and may still be a source of genetic variation in natural allotetraploids. In conclusion, both short- and long-term mechanisms contributed to transcriptomic and phenotypic changes in natural allotetraploids. However, the initial gene expression changes were largely reshaped during long-term evolution leading to further morphological changes.

Funder

Swedish Research Council

Erik Philip-Sorensen Foundation

Royal Physiographic Society in Lund

Sven och Lily Lawskis fond

Publisher

eLife Sciences Publications, Ltd

Reference104 articles.

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5. Genetic basis and timing of a major mating system shift in Capsella;Bachmann;The New Phytologist,2019

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