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Area of Science:

  • Plant reproductive biology
  • Ecology
  • Evolutionary biology

Background:

  • Collinsia verna exhibits traits of an outcrossing species but readily self-pollinates in cultivation.
  • Understanding the mechanism of self-pollination is key to its reproductive strategy.

Purpose of the Study:

  • To elucidate the mechanism of delayed selfing in Collinsia verna.
  • To quantify the reproductive assurance provided by autogamy.
  • To investigate variation in self-pollination rates within natural populations.

Main Methods:

  • Observation of floral development, anther dehiscence, and stigma receptivity.
  • Pollen viability assays.
  • Controlled pollinator exclusion experiments.
  • Field studies of fruiting success and pollen tube growth.

Main Results:

  • Anthers dehisce sequentially, and pollen remains viable until corolla abscission.
  • Stigma receptivity occurs late, after most anthers have dehisced.
  • Delayed selfing provides substantial reproductive assurance, with 33% fruiting success via autogamy.
  • Autogamy rates vary significantly (0-80%) among individuals in natural populations.
  • Nearly all flowers show pollen tube growth after corolla abscission, indicating successful late selfing.

Conclusions:

  • Collinsia verna employs a delayed selfing mechanism, ensuring reproductive success.
  • This mechanism contributes significantly to fruit set, especially when pollinators are scarce.
  • Variation in autogamy suggests complex mating system dynamics and potential ecological influences.
  • Delayed selfing may be a common but overlooked reproductive strategy in other plant species.