It has long been recognized that hybridization and polyploidy are prominent processes in
plant evolution. Although classically recognized as significant in speciation and adaptation …

Explaining the evolution of species geographical ranges is fundamental to understanding
how biodiversity is distributed and maintained. The solution to this classic problem in …

Current rates of climate change require organisms to respond through migration, phenotypic
plasticity, or genetic changes via adaptation. We focused on questions regarding species' …

Hybridization is frequent in many organismal groups, but its role in adaptation is poorly
understood. In sunflowers, species found in the most extreme habitats are ancient hybrids …

Sunflower (Helianthus annuus L.) is one of the few crops native to the United States. The
current USDA–ARS National Plant Germplasm System (NPGS) crop wild relatives sunflower …

The genetic model plant Arabidopsis thaliana, like many plant species, experiences a range
of edaphic conditions across its natural habitat. Such heterogeneity may drive local …

In Alien Species and Evolution, biologist George W. Cox reviews and synthesizes emerging
information on the evolutionary changes that occur in plants, animals, and microbial …

Seeds of Lactuca sativa L.'Romaine'were subjected to priming treatments with UV-C
radiation at 0.85 or 3.42 kJ m− 2. Seedlings obtained from both primed (Pr) and non-primed …

Segregating hybrids often exhibit phenotypes that are extreme or novel relative to the
parental lines. This phenomenon is referred to as transgressive segregation, and it provides …

Sunflowers of the genus Helianthus are models for hybridization research and contain three
of the best-studied examples of homoploid hybrid speciation. To understand a broader …