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CONSEQUENCES OF FLORAL VARIATION FOR MALE AND FEMALE REPRODUCTION IN EXPERIMENTAL POPULATIONS OF WILD RADISH,
Maureen Stanton1, Helen J Young1, Norman C Ellstrand2
1Department of Botany, University of California, Davis, CA, 95616, USA.
Summary
Floral traits in wild radish influence reproductive success. Pollinator type affects seed paternity and maternal fecundity, with native bees showing varied impacts, while large petals reduce overall seed production.
Area of Science:
- Ecology
- Evolutionary Biology
- Plant Sciences
Background:
- Floral traits are crucial for plant reproduction, influencing pollinator attraction and mating success.
- Understanding the interplay between floral variation, pollinator behavior, and reproductive outcomes is key to plant population dynamics.
Purpose of the Study:
- To investigate how floral variation (petal size, pollen number, pollen size) affects seed paternity and maternal fecundity in wild radish (Raphanus sativus).
- To explore the relationships between floral traits, pollinator visitation patterns, and reproductive success using path analysis.
Main Methods:
- Experimental populations of wild radish were established with contrasting floral morphs and designated maternal plants.
- Progeny testing using electrophoretic markers determined paternal success.
- Path analysis modeled relationships between floral characters, pollinator visits, and reproductive outcomes (fecundity, paternity).
Main Results:
- Pollinator visitation patterns varied among taxa, with differential impacts on male and female reproductive success.
- Small native bees increased paternal success, while honey bees reduced male fitness.
- Large-petalled flowers led to fewer flowers and reduced total seed production; postpollination processes significantly influenced reproductive success.
Conclusions:
- Floral morphology and pollinator interactions significantly shape reproductive success in wild radish.
- Pollinator-mediated selection and postpollination processes play vital roles in maintaining genetic variation for floral traits.
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