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    Increased heterosis in selfing populations of a perennial forb

    Quantifying the effects of population bottlenecks and inbreeding on genetic variation underlying fitness in natural populations is central to understanding the potential limits to natural selection. One approach is to estimate heterosis in crosses between populations, thus revealing deleterious mutations that have become fixed within populations by random genetic drift. In a recent study published […] More

  • Flowering and morphology responses to high latitudes
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    Flowering and morphology responses to high latitudes

    Timing of flowering is an adaptive trait regulated by environmental cues and has been intensively studied in annual plants, but in perennials it is currently not well characterized. Quilot-Turion et al. apply cold treatments to two locally adapted populations of the perennial Arabidopsis lyrata from central Europe and Scandinavia and study responses to vernalization. They find […] More