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The S-LOCUS CYSTEINE-RICH PROTEIN (SCR): A Small Peptide with A High Impact on the Evolution of Flowering Plants

  • Isabelle Fobis-Loisy
  • Rumen Ivanov
  • Thierry Gaude
Chapter
Part of the Signaling and Communication in Plants book series (SIGCOMM, volume 16)

Abstract

Self-incompatibility (SI) is an archetypal cell-to-cell communication system in which self-pollen is rejected to prevent inbreeding. In crucifers (or Brassicaceae family), the pollen SI determinant is a small peptide, the S-LOCUS CYSTEINE-RICH PROTEIN (SCR, also known as SP11). During self-pollination, SCR binds to the extracellular domain of its cognate stigmatic receptor, the S-LOCUS RECEPTOR KINASE (SRK). This initiates a signaling cascade leading to self-pollen inhibition. The genes encoding both SI determinants are tightly linked in a multiallelic genomic region defined as the S-locus. Among S alleles, SCR shows extreme variability, and few residues in the protein have been reported to be critical for its specificity. In a heterozygous situation, SCR alleles display complex dominance relationships based on the silencing of certain SCR genes. This chapter provides a summary of the role of SCR in SI, the relationships between SCR alleles, and the role SCR loss played in the model plant Arabidopsis thaliana.

Keywords

Pollen Tube Tapetal Cell Dominance Relationship Anther Development Pollen Coat 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Isabelle Fobis-Loisy
    • 1
  • Rumen Ivanov
    • 2
  • Thierry Gaude
    • 1
  1. 1.Centre National de la Recherche Scientifique, Institut National de la Recherche AgronomiqueUniversité Claude Bernard Lyon I, Ecole Normale Supérieure de LyonLyonFrance
  2. 2.Department of Plant BiologySaarland UniversitySaarbrueckenGermany

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