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Determination of Self-(In)compatibility and Inter-(In)compatibility Relationships in Citrus Using Manual Pollination, Microscopy, and S-Genotype Analyses
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Collaborative non-self recognition system in S-RNase-based self-incompatibility.

Ken-ichi Kubo1, Tetsuyuki Entani, Akie Takara

  • 1Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma 630-0192, Japan.

Science (New York, N.Y.)
|November 6, 2010
PubMed
Summary
This summary is machine-generated.

Flowering plants use self-incompatibility to ensure genetic diversity. In Petunia, multiple S-locus F-box (SLF) proteins collaborate to recognize diverse non-self S-ribonucleases, enabling compatible pollination.

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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids

Published on: September 21, 2017

Area of Science:

  • Plant reproductive biology
  • Molecular genetics
  • Evolutionary biology

Background:

  • Self-incompatibility (SI) is a crucial mechanism in flowering plants, preventing inbreeding and promoting genetic diversity through outcrossing.
  • In the Solanaceae family, the S-locus F-box (SLF) gene encodes the pollen determinant, while S-ribonucleases (S-RNases) represent the pistil determinant in SI.
  • A key question in SI research is how the pollen determinant (SLF) recognizes a wide array of non-self pistil determinants (S-RNases) given SLF's lower allelic diversity.

Purpose of the Study:

  • To investigate the mechanism by which SLF proteins recognize diverse S-RNases in Petunia.
  • To elucidate the collaborative nature of the pollen determinant in recognizing non-self S-RNases.
  • To understand the molecular basis of self-incompatibility in Solanaceae.

Main Methods:

  • In vivo functional assays were employed to test the activity of SLF proteins in pollen tubes.
  • Protein interaction assays were conducted to determine the binding specificities between SLF and S-RNase proteins.
  • Comparative sequence analysis of SLF and S-RNase alleles was performed.

Main Results:

  • In Petunia, at least three distinct types of divergent SLF proteins were identified as functional pollen determinants.
  • Each type of SLF protein demonstrated the ability to recognize a specific subset of non-self S-RNases.
  • These findings suggest a collaborative recognition system rather than a one-to-one interaction between SLF and S-RNase.

Conclusions:

  • The study reveals a collaborative non-self recognition system mediated by multiple SLF proteins in Petunia's self-incompatibility.
  • This collaborative mechanism allows for the recognition of a broad spectrum of non-self S-RNases, resolving the previous puzzle of SLF's recognition capacity.
  • The findings contribute to a deeper understanding of the molecular mechanisms underlying plant self-incompatibility and genetic diversity maintenance.