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Stylish lengths: mate choice in flowers.

B T Ramesha1, M D Yetish, G Ravikanth

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Flower style length evolves to favor longer structures, enhancing pollen competition and mate choice in wild species. This pattern is absent in self-pollinated plants where pollen discrimination is less critical.

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Area of Science:

  • Plant reproductive biology
  • Evolutionary botany
  • Floral trait evolution

Background:

  • Pollen competition is a significant factor influencing plant reproductive success.
  • Style length in flowers can mediate pollen competition by affecting pollen transit time.
  • Understanding the evolutionary drivers of floral traits like style length is crucial for plant science.

Purpose of the Study:

  • To investigate the relationship between style length and pollen competition across diverse plant species.
  • To determine if style length is under selection for mate choice in wild versus domesticated plant populations.
  • To test the hypothesis that longer styles provide a selective advantage in pollen competition.

Main Methods:

  • Comparative analysis of style length distributions in wild, outcrossed, and self-pollinated plant species.
  • Taxonomic sampling across a diverse range of flowering plants.
  • Statistical examination of style length patterns in relation to mating system.

Main Results:

  • Style length distributions in wild and outcrossed species were skewed towards longer styles, supporting the prediction.
  • No significant pattern of skewed style length was observed in self-pollinated domesticated species.
  • The findings indicate directional selection for increased style length in species with significant pollen competition.

Conclusions:

  • Style length is a key trait under directional selection, promoting longer styles as a mechanism for mate choice.
  • This selection pressure is linked to the plant's ability to discriminate among pollen of varying quality.
  • The study highlights the role of style length in mediating sexual selection within plant populations.