Abstract
Premise of research. The wide diversity of floral traits seen among plants is shaped by neutral and selective evolutionary processes. In outcrossing species, sexual selection from competing pollen ...
Highlights
The wide floral diversity in angiosperms is considered largely to be caused by geographic variation in pollinator-mediated selection (Kay and Sargent 2009; Van Der Niet et al 2014; Armbruster 2014)
Our results from C. heterophylla experimental evolution lines suggest that a component of sexual selection during outcross pollination could enhance the patterns of floral divergence commonly found between outcrossers and selfers
We recently studied the evolutionary outcome of this conflict by producing experimental evolution lines by crossing recipients at early floral development with aCC-BY 4.0 International license
Summary
The wide floral diversity in angiosperms is considered largely to be caused by geographic variation in pollinator-mediated selection (Kay and Sargent 2009; Van Der Niet et al 2014; Armbruster 2014). Because differences in mating system (e.g. outcrossing vs selffertilization, or their combination in mixed mating) is correlated with floral and developmental traits (Karron et al 2012; Barrett 2013), selective forces influencing mating system contribute to angiosperm floral diversity. Traits such as small flower size and reduced separation of male-female functions in space and time (herkogamy and dichogamy) are thought to directly favour selfing as reproductive assurance when pollinator visits are unpredictable (Lloyd 1979; Lloyd and Schoen 1992; Opedal 2018). While sexual selection can influence floral traits
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