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The influence of pleiotropy between viability and pollen fates on mating system evolution

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  • Jordan, Crispin Y.

Abstract

Floral displays are functionally and genetically integrated structures, so modifications to display will likely affect multiple fitness components (pleiotropy), including pollen export and self-pollination, and therefore selfing rate. Consequently, the great diversities of floral displays and of mating systems found among angiosperms have likely co-evolved. I extend previous models of mating system evolution to determine how pleiotropy that links viability (e.g., probability of survival to reproduction) and the allocation of pollen for export and selfing affects the evolution of selfing, outcrossing, and in particular, mixed mating. I show that the outcome depends on how pollen shifts from being exported, unused, or used for selfing. Furthermore, pleiotropy that affects viability can explain observations not addressed by previous theory, including the evolution of mixed mating despite high inbreeding depression in the absence of pollen-limitation. Therefore, pleiotropy may play a key role in explaining selfing rates for such species that exhibit otherwise enigmatic mating systems.

Suggested Citation

  • Jordan, Crispin Y., 2015. "The influence of pleiotropy between viability and pollen fates on mating system evolution," Theoretical Population Biology, Elsevier, vol. 99(C), pages 7-17.
    • Handle: RePEc:eee:thpobi:v:99:y:2015:i:c:p:7-17
    DOI: 10.1016/j.tpb.2014.10.005
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    1. Susan Kalisz & Donna W. Vogler & Kristen M. Hanley, 2004. "Context-dependent autonomous self-fertilization yields reproductive assurance and mixed mating," Nature, Nature, vol. 430(7002), pages 884-887, August.
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