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Seminář: Dr. Pierre Baduel

Dr. Pierre Baduel - A ticket to ride: diploid CONSTANS allele tapped in secondary railway colonization by tetraploid Arabidopsis arenosa
Čas 05.12.2017
od 15:00 do 16:30
Přiložený soubor: 2017_ZS_seminar_10_Baduel.pdf
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A ticket to ride:

diploid CONSTANS allele tapped in secondary railway colonization by tetraploid Arabidopsis arenosa

 

Dr. Pierre Baduel 

(Institut de Biologie de l'École Normale Supérieure (IBENS), Paris)

 

 

Human-generated ruderal habitats are abundant, but challenging for plants. Some ruderal habitats, however, provide networked corridors (e.g. roadsides and railways) that can facilitate rapid long-distance spread of successfully adapted variants. Here we use transcriptomic and genomic analyses, coupled with genetic mapping and transgenics to understand adaptation to railways inArabidopsis arenosa. We found a secondary railway colonist in the Alps cycling rapidly, but retaining high expression of the reproductive repressor FLOWERING LOCUS C (FLCcontrary to the widespread railway colonist. Some  FLC alleles in this population encode non-functional proteins, suggesting FLC has started to decay, but most are functional. Instead, this population likely circumvents FLC via a derived allele of CONSTANS (CO), which shows strong evidence of selection in this population. Importantly, we found this CO allele arrived via gene flow from the widespread ruderal, where it was also previously under selection. However, this railway CO allele was not a tetraploid innovation but likely obtained from diploids through a contact zone on the shores of the Baltic. This suggests major habitat adaptations by tetraploids can rely extensively on interploidy introgression and puts into new light the question of the evolutionary advantages of polyploidy.

Invitation HERE.

Publikováno: Úterý 28.11.2017 00:00

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