| Presentation Detail
Population Genetics and/or Genomics, Empirical Renaut, Sebastien [1], Rieseberg, Loren [2]. Parallel Genomic Evolution But Not Parallel Speciation in Annual Sunflowers. The late Stephen Gould argued that "rewinding the tape of life" would produce a very different array of end products, yet others have reported that the evolution of some traits and species can be surprisingly repeatable. However, little is known about the repeatability of evolution at the genomic level. Here we employ transcriptome sequencing for three pairs of sister species in the sunflower genus (Helianthus annuus - H. argophyllus, H.debilis - H. petiolaris and H. exilis - H. bolanderi) to study the repeatability of genomic changes that have accompanied their divergence. Analyses of divergence indicated high repeatability across 1 centiMorgan genomic regions, modest repeatability at the level of individual genes and very little repeatability for individual SNPs. In addition, we find higher repeatability when comparing the two species pairs that have diverged along a similar photoperiod, temperature and moisture gradient. Thus, parallel divergence is partly explained by parallel selection pressure. At the same time, it is also strongly influenced by the fact that some genes probably matter more than others in adaptation and lastly by shared heterogeneity in both recombination and mutation rates. In conclusion, parallel genomic evolution results from both parallel adaptation and shared genomic architecture.
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1 - University of British Columbia, Botany, 6270 University Blvd, Vancouver, BC, V6T1Z4, Canada
2 - University Of British Columbia, Department Of Botany, 6270 University Blvd, Vancouver, BC, V6T 1Z4, Canada
Keywords:
transcriptomics
Adaptive divergence
population genomics
parallelism.
Presentation Type: Regular Oral Presentation
Session: 41
Location: Alpine A and B/Snowbird Center
Date: Saturday, June 22nd, 2013
Time: 3:30 PM
Number: 41001
Abstract ID:195
Candidate for Awards:W.D. Hamilton Award for Outstanding Student Presentation |
