FUNCTIONAL PLEIOTROPY AND MATING SYSTEM EVOLUTION IN PLANTS: FREQUENCY-INDEPENDENT MATING
Article first published online: 14 FEB 2012
© 2012 The Author(s). Evolution© 2012 The Society for the Study of Evolution.
Volume 66, Issue 4, pages 957–972, April 2012
How to Cite
Jordan, C. Y. and Otto, S. P. (2012), FUNCTIONAL PLEIOTROPY AND MATING SYSTEM EVOLUTION IN PLANTS: FREQUENCY-INDEPENDENT MATING. Evolution, 66: 957–972. doi: 10.1111/j.1558-5646.2011.01513.x
- Issue published online: 6 APR 2012
- Article first published online: 14 FEB 2012
- Accepted manuscript online: 22 NOV 2011 12:35AM EST
- Received January 18, 2011 , Accepted October 18, 2011.
Vol. 66, Issue 9, 2992, Article first published online: 9 JUN 2012
- Mixed mating;
- pollen discounting;
- prior selfing;
- selfing rate;
Mutations that alter the morphology of floral displays (e.g., flower size) or plant development can change multiple functions simultaneously, such as pollen export and selfing rate. Given the effect of these various traits on fitness, pleiotropy may alter the evolution of both mating systems and floral displays, two characters with high diversity among angiosperms. The influence of viability selection on mating system evolution has not been studied theoretically. We model plant mating system evolution when a single locus simultaneously affects the selfing rate, pollen export, and viability. We assume frequency-independent mating, so our model characterizes prior selfing. Pleiotropy between increased viability and selfing rate reduces opportunities for the evolution of pure outcrossing, can favor complete selfing despite high inbreeding depression, and notably, can cause the evolution of mixed mating despite very high inbreeding depression. These results highlight the importance of pleiotropy for mating system evolution and suggest that selection by nonpollinating agents may help explain mixed mating, particularly in species with very high inbreeding depression.