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Related Experiment Videos

Adhesion and guidance in compatible pollination.

E M Lord1

  • 1Department of Botany and Plant Sciences, University of California Riverside, Riverside, CA 92521-0124, USA. LORD@ucracl.ucr.edu

Journal of Experimental Botany
|November 29, 2002
PubMed
Summary
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Self-compatibility in flowering plants is common but understudied. Research reveals pollen tube guidance involves a hierarchy of signals from stigma to ovule, with specific molecules like SCA playing dual roles in lily pollination.

Area of Science:

  • Plant reproduction
  • Molecular biology
  • Cell biology

Background:

  • Most angiosperms are self-compatible, yet compatible pollination mechanisms remain less understood than incompatible ones.
  • Pollen tube guidance to ovules involves complex interactions within the pistil's extracellular matrices.
  • Understanding in vivo pollen tube cell biology and guidance cues is crucial.

Purpose of the Study:

  • To investigate the mechanisms of pollen tube guidance within the pistil.
  • To identify molecules and cells involved in directing pollen tubes towards ovules.
  • To explore the hierarchy of signaling events in pollen-pistil interactions.

Main Methods:

  • Utilized model systems for discovering guidance molecules in the pistil.
  • Investigated pollen-pistil interactions in lily, a species with a hollow style.

Related Experiment Videos

  • Employed in vitro assays to assess pollen chemotropism.

    • Main Results:

    • Adhesion molecules, including pectin and SCA (Sperm Cell Associated protein), are implicated in guidance within the lily style.
    • SCA alone can induce chemotropism in pollen during in vitro assays.
    • Evidence suggests a dual role for SCA in lily pollination: chemotactic on the stigma and haptotactic in the style.

    Conclusions:

    • Pollen tube guidance involves a sequential hierarchy of signals from the stigma to the ovule.
    • Molecules like SCA play multifaceted roles in pollen-pistil communication.
    • Further research is needed to fully elucidate the in vivo cell biology of pollen tube guidance.