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Related Experiment Videos

Pollen-stigma interactions in Brassica.

H G Dickinson1, J Doughty, S J Hiscock

  • 1Department of Plant Sciences, University of Oxford, UK.

Symposia of the Society for Experimental Biology
|January 25, 2000
PubMed
Summary
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Brassica oleracea pollen contains self-incompatibility proteins (PCP-A) in its coating. These proteins interact with the stigma

Area of Science:

  • Plant reproductive biology
  • Molecular genetics
  • Protein interactions

Background:

  • Brassica oleracea self-incompatibility is regulated by S-receptor kinases.
  • Pollen coat proteins (PCP-A) are highly charged and polymorphic.
  • Previous in vitro studies suggested PCP-A interaction with the S-receptor complex.

Purpose of the Study:

  • To investigate the role of pollen coat proteins in Brassica oleracea self-incompatibility.
  • To identify the male determinant of the self-incompatibility system.
  • To elucidate the molecular mechanisms underlying pollen-stigma interactions.

Main Methods:

  • Development of a novel in vivo bioassay for self-incompatibility.
  • Interspecific studies and molecular analysis of PCP-A proteins.

Related Experiment Videos

  • In vitro binding assays to study protein interactions.

    • Main Results:

    • The male determinant of self-incompatibility is a low molecular mass protein within the pollen coating.
    • PCP-A1 specifically interacts with the stigmatic S-receptor complex.
    • Different PCP-A proteins may mediate compatibility and self-pollen rejection.

    Conclusions:

    • Pollen coat proteins are crucial for regulating Brassica oleracea self-incompatibility.
    • PCP-A1 likely establishes pollen-stigma compatibility.
    • Other PCP-A proteins regulate S-specific rejection, contributing to the evolution of self-incompatibility in Brassica.