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Pollen Acceptance or Rejection: A Tale of Two Pathways
Jennifer Doucet1, Hyun Kyung Lee1, Daphne R Goring2
1Department of Cell and Systems Biology, University of Toronto, Toronto M5S 3B2, Canada.
Trends in Plant Science
|October 25, 2016
Summary
Brassicaceae pollen recognition involves a basal compatible pathway for germination and a self-incompatibility pathway for rejection. Recent studies reveal how stigmas accept compatible pollen while rejecting self-pollen.
Area of Science:
- Plant reproductive biology
- Molecular and cellular signaling in plants
Background:
- Extensive research exists on self-incompatibility (SI) and self-pollen rejection in Brassicaceae.
- Limited understanding of compatible pollen recognition and cellular responses in stigmatic papillae.
Purpose of the Study:
- To review recent discoveries in compatible pollen acceptance and self-pollen rejection pathways in Brassicaceae.
- To elucidate the cellular mechanisms underlying pollen-stigma interactions.
Main Methods:
- Review of current literature on pollen-stigma communication in Brassicaceae.
- Analysis of molecular and cellular responses in stigmatic papillae.
Main Results:
- Identification of the Brassicaceae 'basal compatible pollen response pathway' in the stigma, promoting pollen hydration and germination.
- Evidence suggests self-incompatible pollen activates both compatible and SI pathways, with SI ultimately dominating rejection.
- Differential activation of pathways determines pollen acceptance or rejection.
Conclusions:
- Compatible pollen triggers a specific pathway for successful germination.
- Self-incompatible pollen engages both compatible and rejection pathways, leading to discrimination.
- Understanding these pathways is crucial for plant breeding and reproductive biology.
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