Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Mol Biol Evol. 2011 May;28(5):1569-80. doi: 10.1093/molbev/msq270. Epub 2010 Oct 15.

Effective population size is positively correlated with levels of adaptive divergence among annual sunflowers.

Author information

  • 1Department of Biology, Indiana University. jstrasbu@indiana.edu

Abstract

The role of adaptation in the divergence of lineages has long been a central question in evolutionary biology, and as multilocus sequence data sets have become available for a wide range of taxa, empirical estimates of levels of adaptive molecular evolution are increasingly common. Estimates vary widely among taxa, with high levels of adaptive evolution in Drosophila, bacteria, and viruses but very little evidence of widespread adaptive evolution in hominids. Although estimates in plants are more limited, some recent work has suggested that rates of adaptive evolution in a range of plant taxa are surprisingly low and that there is little association between adaptive evolution and effective population size in contrast to patterns seen in other taxa. Here, we analyze data from 35 loci for six sunflower species that vary dramatically in effective population size. We find that rates of adaptive evolution are positively correlated with effective population size in these species, with a significant fraction of amino acid substitutions driven by positive selection in the species with the largest effective population sizes but little or no evidence of adaptive evolution in species with smaller effective population sizes. Although other factors likely contribute as well, in sunflowers effective population size appears to be an important determinant of rates of adaptive evolution.

PMID:
20952500
[PubMed - indexed for MEDLINE]
PMCID:
PMC3080132
Free PMC Article

Images from this publication.See all images (3)Free text

F IG . 1.
F IG . 2.
F IG . 3.
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for HighWire Icon for PubMed Central Icon for Faculty of 1000
    Loading ...
    Write to the Help Desk