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Evolutionary relationships among self-incompatibility RNases.

B Igic1, J R Kohn

  • 1Section of Ecology, Behavior, and Evolution, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA. bigic@ucsd.edu

Proceedings of the National Academy of Sciences of the United States of America
|November 8, 2001
PubMed
Summary
This summary is machine-generated.

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RNases facilitate self-pollen rejection in flowering plants. Phylogenetic analysis reveals this trait is homologous across Solanaceae, Scrophulariaceae, and Rosaceae, suggesting an ancient origin for RNase-based self-incompatibility.

Area of Science:

  • Plant reproductive biology
  • Molecular evolution
  • Genetics

Background:

  • Self-incompatibility (SI) is a crucial mechanism preventing self-fertilization in flowering plants.
  • T2-type RNases play a key role in pollen recognition and rejection in several plant families.
  • The evolutionary origin of RNase-based SI in different plant lineages remains an open question.

Purpose of the Study:

  • To investigate whether the use of T2-type RNases for self-incompatibility in Solanaceae, Scrophulariaceae, and Rosaceae is a homologous or convergent trait.
  • To infer the ancestral state of RNase-based self-incompatibility in dicotyledonous plants.

Main Methods:

  • Phylogenetic analyses of 67 T2-type RNase sequences.
  • Comparative analysis of intron number and position across RNase genes.

Related Experiment Videos

  • Reconstruction of phylogenetic relationships using multiple methods.

    • Main Results:

    • Phylogenetic analyses consistently grouped self-incompatibility RNases from the studied families into a monophyletic clade.
    • Intron structure patterns further supported the homology of these RNases.
    • The results indicate that RNase-based self-incompatibility evolved prior to the divergence of these three families.

    Conclusions:

    • The use of T2-type RNases for self-incompatibility in Solanaceae, Scrophulariaceae, and Rosaceae is homologous, not convergent.
    • RNase-based self-incompatibility likely represents the ancestral state for the majority of dicotyledonous plants.